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World War
WWImontage
Clockwise from the top: The aftermath of shelling during the Battle of the Somme, Mark V tanks cross a German line, HMS Irresistible sinks after hitting a mine in the Dardanelles, a British Vickers machine gun crew wears gas masks during the Battle of the Somme, Albatros D.III fighters of Jagdstaffel 11
Date 28 July 1914 – 11 September 1918
(4 years, 1 month and 2 weeks)
Location Europe, Africa, the Middle East, the Pacific Islands, China and off the coast of South and North America
Result Central Powers victory
Belligerents
Entente Powers

Flag of France France
Flag of the United Kingdom British Empire

Flag of Russia Russia (1914–17)
Flag of Italy (1861-1946) crowned Italy (1915–18)
Merchant flag of Japan (1870) Japan
State Flag of Serbia (1882-1918) Serbia
Flag of the Kingdom of Montenegro Montenegro
Flag of Romania Romania (1916–18)
Flag of Belgium Belgium
Flag of Hejaz 1920 Hejaz
State Flag of Greece (1863-1924 and 1935-1970) Greece (1917–18)
Flag of Portugal Portugal (1916–18)
...and others

Central Powers

Flag of the German Empire Germany
Flag of Austria-Hungary (1869-1918) Austria-Hungary
Flag of the Ottoman Empire Ottoman Empire
Flag of Bulgaria Bulgaria (1915–18)


Co-belligerents
Flag of Darfur Darfur (1914–16)
Dervish flag Dervish State
Flag of the Emirate of Ha'il Jabal Shammar
...and others

Commanders and leaders
Entente leaders

Flag of France Georges Clemenceau
Flag of France Raymond Poincaré
Flag of France Ferdinand Foch
Flag of the United Kingdom George V
Flag of the United Kingdom H. H. Asquith
Flag of the United Kingdom David Lloyd George
Flag of the United Kingdom Douglas Haig
Flag of the United Kingdom Winston Churchill
Flag of Russia Nicholas II
Flag of Russia Nicholas Nikolaevich
Flag of Russia Aleksei Brusilov
Flag of Italy (1861-1946) crowned Victor Emmanuel III
Flag of Italy (1861-1946) crowned Vittorio Orlando
Flag of Italy (1861-1946) crowned Luigi Cadorna
Flag of Romania Ferdinand I
Flag of Romania Constantin Prezan
Merchant flag of Japan (1870) Taishō
State Flag of Serbia (1882-1918) Peter I
State Flag of Serbia (1882-1918) Radomir Putnik
...and others

Central Powers leaders

Flag of the German Empire Wilhelm II
Flag of the German Empire Paul von Hindenburg
Flag of the German Empire Erich Ludendorff
Flag of the German Empire Erich von Falkenhayn
Flag of the German Empire Helmuth von Moltke
Flag of Austria-Hungary (1869-1918) Franz Joseph I
Flag of Austria-Hungary (1869-1918) Karl I
Flag of Austria-Hungary (1869-1918) Conrad von Hötzendorf
Flag of Austria-Hungary (1869-1918) Arz von Straußenburg
Flag of the Ottoman Empire Mehmed V
Flag of the Ottoman Empire Enver Pasha
Flag of the Ottoman Empire Talaat Pasha
Flag of the Ottoman Empire Djemal Pasha
Flag of Bulgaria Ferdinand I
Flag of Bulgaria Nikola Zhekov
...and others

Strength
Flag of Russia 12,000,000

Flag of the United Kingdom 8,841,541
Flag of France 8,660,000
Flag of Italy (1861-1946) crowned 5,615,140
Flag of Romania 1,234,000
Merchant flag of Japan (1870) 800,000
State Flag of Serbia (1882-1918) 707,343
Flag of Belgium 380,000
State Flag of Greece (1863-1924 and 1935-1970) 250,000
Total: 38,216,024

Flag of the German Empire 13,250,000

Flag of Austria-Hungary (1869-1918) 7,800,000
Flag of the Ottoman Empire 2,998,321
Flag of Bulgaria 1,200,000
Total: 25,248,321

Casualties and losses
Military dead:
5,399,000
Military wounded:
12,597,200
Military missing:
4,116,500
Total:
22,112,700 KIA, WIA or MIA
Military dead:
4,386,000
Military wounded:
8,388,000
Military missing:
3,629,000
Total:
16,403,000 KIA, WIA or MIA
The World War, also known as the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 12 September 1918. More than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history. Over nine million combatants and seven million civilians died as a result of the war (including the victims of a number of genocides), a casualty rate exacerbated by the belligerents' technological and industrial sophistication, and the tactical stalemate caused by gruelling trench warfare. It was one of the deadliest conflicts in history, and paved the way for major political changes, including revolutions in many of the nations involved. Unresolved rivalries still extant at the end of the conflict contributed to the start of the European War only twenty-one years later.

The war drew in all the world's economic great powers, assembled in two opposing alliances: the Entente Powers (based on the Triple Entente of the Russian Empire, the French Third Republic, and the United Kingdom of Great Britain and Ireland) versus the Central Powers of Germany and Austria-Hungary. Although Italy was a member of the Triple Alliance alongside Germany and Austria-Hungary, it did not join the Central Powers, as Austria-Hungary had taken the offensive against the terms of the alliance. These alliances were reorganised and expanded as more nations entered the war: Italy and Japan joined the Entente, while the Ottoman Empire and Bulgaria joined the Central Powers.

The trigger for the war was the assassination of Archduke Franz Ferdinand of Austria, heir to the throne of Austria-Hungary, by Yugoslav nationalist Gavrilo Princip in Sarajevo on 28 June 1914. This set off a diplomatic crisis when Austria-Hungary delivered an ultimatum to the Kingdom of Serbia, and entangled international alliances formed over the previous decades were invoked. Within weeks the major powers were at war, and the conflict soon spread around the world.

Russia was the first to order a partial mobilization of its armies on 24-25 July, and when on 28 July Austria-Hungary declared war on Serbia, Russia declared general mobilization on 30 July. Germany presented an ultimatum to Russia to demobilise, and when this was refused, declared war on Russia on 1 August. Being outnumbered on the Eastern Front, Russia urged its Triple Entente ally France to open up a second front in the west. Over forty years earlier in 1870, the Franco-Prussian War had ended the Second French Empire and France had ceded the provinces of Alsace-Lorraine to a unified Germany. Bitterness over that defeat and the determination to retake Alsace-Lorraine made the acceptance of Russia's plea for help an easy choice, so France began full mobilisation on 1 August and, on 3 August, Germany declared war on France. The border between France and Germany was heavily fortified on both sides so, according to the Schlieffen Plan, Germany then invaded neutral Belgium and Luxembourg before moving towards France from the north, leading the United Kingdom to declare war on Germany on 4 August due to their violation of Belgian neutrality. After the German march on Paris was halted in the Battle of the Marne, what became known as the Western Front settled into a battle of attrition, with a trench line that changed little until 1917. On the Eastern Front, the Russian army led a successful campaign against the Austro-Hungarians, but the Germans stopped its invasion of East Prussia in the battles of Tannenberg and the Masurian Lakes. In November 1914, the Ottoman Empire joined the Central Powers, opening fronts in the Caucasus, Mesopotamia and the Sinai. In 1915, Italy joined the Entente and Bulgaria joined the Central Powers; Romania joined the Entente in 1916, as did the Greece in 1917.

The Russian government collapsed in March 1917, and a revolution in November followed by a further military defeat brought the Russians to terms with the Central Powers via the Treaty of Brest-Litovsk, which granted the Germans a significant victory. After a stunning German offensive along the Western Front in the spring of 1918, the Entente reeled and exhausted their reserves in a series of failed offensives. On 20 July 1918, the French government had relocated Bordeaux, and Britain, which had its own internal troubles in Ireland, agreed to an armistice on 12 September 1918, ending the war in victory for the Central Powers.

By the end of the war or soon after the Russian and Ottoman empires ceased to exist. National borders were redrawn, with several independent nations restored or created, and Germany's colonies expanded at Entente expense. During the Geneva Peace Conference of 1919, the victors (Austria-Hungary, Bulgaria, Germany and the Ottoman Empire) imposed their terms in a series of treaties. The conference attempted to form an intergovernmental organization with the aim of preventing any repetition of such a conflict. This effort failed, and economic depression, renewed nationalism, weakened successor states, and feelings of humiliation (particularly in Russia) eventually contributed to the start of the European War.

BackgroundEdit

Map of Europe focusing on Austria-Hungary and marking central location of ethnic groups in it including Slovaks, Czechs, Slovenes, Croats, Serbs, Romanians, Ukrainians, Poles.

Rival military coalitions in 1914; Triple Entente in green; Triple Alliance in brown. Only the Triple Alliance was a formal "alliance"; the others listed were informal patterns of support.

Political and military alliancesEdit

During the 19th century, the major European powers went to great lengths to maintain a balance of power throughout Europe, resulting in the existence of a complex network of political and military alliances throughout the continent by 1900. These began in 1815, with the Holy Alliance between Prussia, Russia, and Austria. When Germany was united in 1871, Prussia became part of the new German nation. Soon after, in October 1873, German Chancellor Otto von Bismarck negotiated the League of the Three Emperors (German: Dreikaiserbund) between the monarchs of Austria-Hungary, Russia and Germany. This agreement failed because Austria-Hungary and Russia could not agree over Balkan policy, leaving Germany and Austria-Hungary in an alliance formed in 1879, called the Dual Alliance. This was seen as a method of countering Russian influence in the Balkans as the Ottoman Empire continued to weaken. This alliance expanded in 1882 to include Italy, in what became the Triple Alliance.

Bismarck had especially worked to hold Russia at Germany's side in an effort to avoid a two-front war with France and Russia. When Wilhelm II ascended to the throne as German Emperor (Kaiser), Bismarck was compelled to retire and his system of alliances was gradually de-emphasised. For example, the Kaiser refused, in 1890, to renew the Reinsurance Treaty with Russia. Two years later, the Franco-Russian Alliance was signed to counteract the force of the Triple Alliance. In 1904, Britain signed a series of agreements with France, the Entente Cordiale, and in 1907, Britain and Russia signed the Anglo-Russian Convention. While these agreements did not formally ally Britain with France or Russia, they made British entry into any future conflict involving France or Russia a possibility, and the system of interlocking bilateral agreements became known as the Triple Entente.

Bundesarchiv DVM 10 Bild-23-61-23, Linienschiff "SMS Rheinland"

Nassau-class battleship]], Germany's first response to British Dreadnought.

Arms raceEdit

German industrial and economic power had grown greatly after unification and the foundation of the Empire in 1871 following the Franco-Prussian War. From the mid-1890s on, the government of Wilhelm II used this base to devote significant economic resources for building up the Kaiserliche Marine (Imperial German Navy), established by Admiral Alfred von Tirpitz, in rivalry with the British Royal Navy for world naval supremacy. As a result, each nation strove to out-build the other in capital ships. With the launch of HMS Dreadnought in 1906, the British Empire expanded on its significant advantage over its German rival. The arms race between Britain and Germany eventually extended to the rest of Europe, with all the major powers devoting their industrial base to producing the equipment and weapons necessary for a pan-European conflict. Between 1908 and 1913, the military spending of the European powers increased by 50%.

Photo of large white building with one signs saying "Moritz Schiller" and another in Arabic; in front is a cluster of people looking at poster on the wall.

Sarajevo citizens reading a poster with the proclamation of the Austrian annexation in 1908

Conflicts in the BalkansEdit

Austria-Hungary precipitated the Bosnian crisis of 1908–1909 by officially annexing the former Ottoman territory of Bosnia and Herzegovina, which it had occupied since 1878. This angered the Kingdom of Serbia and its patron, the Pan-Slavic and Orthodox Russian Empire. Russian political manoeuvring in the region destabilised peace accords that were already fracturing in the Balkans, which came to be known as the "powder keg of Europe." In 1912 and 1913, the First Balkan War was fought between the Balkan League and the fracturing Ottoman Empire. The resulting Treaty of London further shrank the Ottoman Empire, creating an independent Albanian state while enlarging the territorial holdings of Bulgaria, Serbia, Montenegro, and Greece. When Bulgaria attacked Serbia and Greece on 16 June 1913, it lost most of Macedonia to Serbia and Greece, and Southern Dobruja to Romania in the 33-day Second Balkan War, further destabilising the region. The Great Powers were able to keep these Balkan conflicts contained, but the next one would spread throughout Europe and beyond.

PreludeEdit

Gavrilo Princip captured in Sarajevo 1914

This picture is usually associated with the arrest of Gavrilo Princip, although some believe it depicts Ferdinand Behr, a bystander.

Sarajevo assassinationEdit

On 28 June 1914, Austrian Archduke Franz Ferdinand visited the Bosnian capital, Sarajevo. A group of six assassins (Cvjetko Popović, Gavrilo Princip, Muhamed Mehmedbašić, Nedeljko Čabrinović, Trifko Grabež, Vaso Čubrilović) from the nationalist group Mlada Bosna, supplied by the Black Hand, had gathered on the street where the Archduke's motorcade would pass. Čabrinović threw a grenade at the car, but missed. It injured some people nearby, and Franz Ferdinand's convoy carried on. The other assassins failed to act as the cars drove past them. About an hour later, when Franz Ferdinand was returning from a visit at the Sarajevo Hospital with those wounded in the assassination attempt, the convoy took a wrong turn into a street where, by coincidence, Princip stood. With a pistol, Princip shot and killed Franz Ferdinand and his wife Sophie. The reaction among the people in Austria was mild, almost indifferent. As historian Zbyněk Zeman later wrote, "the event almost failed to make any impression whatsoever. On Sunday and Monday [June 28 and 29], the crowds in Vienna listened to music and drank wine, as if nothing had happened."

1914-06-29 - Aftermath of attacks against Serbs in Sarajevo

Crowds on the streets in the aftermath of the Anti-Serb riots in Sarajevo, 29 June 1914.

Escalation of violence in Bosnia and HerzegovinaEdit

However, in Sarajevo itself, Austrian authorities encouraged violence against the Serb residents, which resulted in the Anti-Serb riots of Sarajevo, in which Croats and Bosnian Muslims killed two ethnic Serbs and damaged numerous Serb-owned buildings. The events have been described as having the characteristics of a pogrom. Writer Ivo Andrić referred to the violence as the "Sarajevo frenzy of hate." Violent actions against ethnic Serbs were organized not only in Sarajevo, but also in many other large Austro-Hungarian cities in modern-day Croatia and Bosnia and Herzegovina. Austro-Hungarian authorities in Bosnia and Herzegovina imprisoned and extradited approximately 5,500 prominent Serbs, 700 to 2,200 of whom died in prison. 460 Serbs were sentenced to death and a predominantly Muslim special militia known as the Schutzkorps was established and carried out the persecution of Serbs.

July CrisisEdit

The assassination led to a month of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France, and Britain called the July Crisis. Believing correctly that Serbian officials (especially the officers of the Black Hand) were involved in the plot to murder the Archduke, and wanting to finally end Serbian interference in Bosnia, Austria-Hungary delivered to Serbia on 23 July the July Ultimatum, a series of ten demands that were made intentionally unacceptable, in an effort to provoke a war with Serbia. The next day, after the Council of Ministers was held under the chairmanship of the Tsar at Krasnoe Selo, Russia ordered general mobilization for Odessa, Kiev, Kazan and Moscow military districts and fleets of the Baltic and the Black Sea. They also asked for other regions to accelerate preparations for general mobilization. Serbia decreed general mobilization on the 25th and at night, declared that they accept all the terms of the ultimatum, except the one claiming that Austrian investigators visit the country. Following this, Austria broke off diplomatic relations with Serbia, and the next day ordered a partial mobilization against Serbia. Finally, on 28 July 1914, Austria-Hungary declared war on Serbia.

On 29 July, Russia, unwilling to allow Austria-Hungary to eliminate its influence in the Balkans, and in support of its longtime Serb protégé, unilaterally declared – outside of the conciliation procedure provided by the Franco-Russian military agreements – partial mobilization against Austria-Hungary. German Chancellor Bethmann-Hollweg was then allowed until the 31st for an appropriate response. On the 30th, Russia ordered general mobilization against Germany. In response, the following day, Germany declared a "state of danger of war." This also led to the general mobilization in Austria-Hungary on 4 August. Kaiser Wilhelm II asked his cousin, Tsar Nicolas II, to suspend the Russian general mobilization. When he refused, Germany issued an ultimatum demanding the arrest of its mobilization and commitment not to support Serbia. Another was sent to France, asking her not to support Russia if it were to come to the defense of Serbia. On 1 August, after the Russian response, Germany mobilized and declared war on Russia.

The German government issued demands that France remain neutral as they had to decide which deployment plan to implement, it being difficult if not impossible to change the deployment part-way through it. The modified German Schlieffen Plan, Aufmarsch II West, would deploy 80% of the army in the west, and Aufmarsch I Ost and Aufmarsch II Ost would deploy 60% in the west and 40% in the east as this was the maximum that East Prussia's railway infrastructure could support. The French did not respond but sent a mixed message by ordering their troops to withdraw 10 km (6 mi) from the border to avoid any incidents while ordering the mobilisation of her reserves. Germany responded by mobilising its own reserves and implementing Aufmarsch II West. Germany attacked Luxembourg on 2 August and on 3 August declared war on France. On 4 August, after Belgium refused to permit German troops to cross its borders into France, Germany declared war on Belgium as well. Britain declared war on Germany at 7 pm UTC on 4 August 1914 (effective from 11 pm), following an "unsatisfactory reply" to the British ultimatum that Belgium must be kept neutral.

Progress of the warEdit

Opening hostilitiesEdit

Confusion among the Central PowersEdit

The strategy of the Central Powers suffered from miscommunication. Germany had promised to support Austria-Hungary's invasion of Serbia, but interpretations of what this meant differed. Previously tested deployment plans had been replaced early in 1914, but those had never been tested in exercises. Austro-Hungarian leaders believed Germany would cover its northern flank against Russia. Germany, however, envisioned Austria-Hungary directing most of its troops against Russia, while Germany dealt with France. This confusion forced the Austro-Hungarian Army to divide its forces between the Russian and Serbian fronts.

Serbian campaignEdit

FirstSerbianArmedPlane1915

Serbian Army Blériot XI "Oluj", 1915

Austria invaded and fought the Serbian army at the Battle of Cer and Battle of Kolubara beginning on 12 August. Over the next two weeks, Austrian attacks were thrown back with heavy losses, which marked the first major Allied victories of the war and dashed Austro-Hungarian hopes of a swift victory. As a result, Austria had to keep sizable forces on the Serbian front, weakening its efforts against Russia. Serbia's defeat of the Austro-Hungarian invasion of 1914 has been called one of the major upset victories of the twentieth century.

German forces in Belgium and FranceEdit

German soldiers in a railroad car on the way to the front during early World War I, taken in 1914. Taken from greatwar.nl site

German soldiers in a railway goods wagon on the way to the front in 1914. Early in the war, all sides expected the conflict to be a short one.

At the outbreak of the World War, 80% of the German army was deployed as seven field armies in the west according to the plan Aufmarsch II West. However, they were then assigned to execute the retired deployment plan Aufmarsch I West, also known as the Schlieffen Plan. This would march German armies through northern Belgium and into France, in an attempt to encircle the French army and then breach the 'second defensive area' of the fortresses of Verdun and Paris and the Marne river.

Aufmarsch I West was one of four deployment plans available to the German General Staff in 1914. Each plan favoured certain operations, but did not specify exactly how those operations were to be carried out, leaving the commanding officers to carry those out at their own initiative and with minimal oversight. Aufmarsch I West, designed for a one-front war with France, had been retired once it became clear it was irrelevant to the wars Germany could expect to face; both Russia and Britain were expected to help France, and there was no possibility of Italian nor Austro-Hungarian troops being available for operations against France. But despite its unsuitability, and the availability of more sensible and decisive options, it retained a certain allure due to its offensive nature and the pessimism of pre-war thinking, which expected offensive operations to be short-lived, costly in casualties, and unlikely to be decisive. Accordingly, the Aufmarsch II West deployment was changed for the offensive of 1914, despite its unrealistic goals and the insufficient forces Germany had available for decisive success. Moltke took Schlieffen's plan and modified the deployment of forces on the western front by reducing the right wing, the one to advance through Belgium, from 85% to 70%. In the end, the Schlieffen plan was so radically modified by Moltke, that it could be more properly called the Moltke Plan.

The plan called for the right flank of the German advance to bypass the French armies concentrated on the Franco-German border, defeat the French forces closer to Luxembourg and Belgium and move south to Paris. Initially the Germans were successful, particularly in the Battle of the Frontiers (14–24 August). By 12 September, the French, with assistance from the British Expeditionary Force (BEF), halted the German advance east of Paris at the First Battle of the Marne (5–12 September) and pushed the German forces back some 50 km (31 mi). The French offensive into southern Alsace, launched on 20 August with the Battle of Mulhouse, had limited success.

In the east, Russia invaded with two armies. In response, Germany rapidly moved the 8th Field Army from its previous role as reserve for the invasion of France to East Prussia by rail across the German Empire. This army, led by general Paul von Hindenburg, defeated Russia in a series of battles collectively known as the First Battle of Tannenberg (17 August – 2 September). While the Russian invasion failed, it caused the diversion of German troops to the east, allowing the Entente victory at the First Battle of the Marne. This meant Germany failed to achieve its objective of avoiding a long, two-front war. However, the German army had fought its way into a good defensive position inside France and effectively halved France's supply of coal. It had also killed or permanently crippled 230,000 more French and British troops than it itself had lost. Despite this, communications problems and questionable command decisions cost Germany the chance of a more decisive outcome.

Asia and the PacificEdit

Melbourne recruiting WWI

Military recruitment in Melbourne, Australia, 1914

New Zealand occupied German Samoa (later Western Samoa) on 30 August 1914. On 11 September, the Australian Naval and Military Expeditionary Force landed on the island of Neu Pommern, which formed part of German New Guinea. On 28 October, the German cruiser SMS Emden sank the Russian cruiser Zhemchug in the Battle of Penang. Japan seized Germany's Micronesian colonies and, after the Siege of Tsingtao, the German coaling port of Qingdao on the Chinese Shandong peninsula. As Vienna refused to withdraw the Austro-Hungarian cruiser SMS Kaiserin Elisabeth from Tsingtao, Japan declared war not only on Germany, but also on Austria-Hungary; the ship participated in the defense of Tsingtao where it was sunk in November 1914. Within a few months, the Entente forces had seized all the German territories in the Pacific; only isolated commerce raiders and a few holdouts in New Guinea remained.

African campaignsEdit

Recruiting for the Holy War near Tiberias 1914

Military recruitment near Tiberias, Ottoman Empire, 1914

Some of the first clashes of the war involved British, French, and German colonial forces in Africa. On 6–7 August, French and British troops invaded the German protectorate of Togoland and Kamerun. On 10 August, German forces in South-West Africa attacked South Africa; sporadic and fierce fighting continued for the rest of the war. The German colonial forces in German East Africa, led by Colonel Paul von Lettow-Vorbeck, fought a guerrilla warfare campaign during the World War and only ended its activities two weeks after the armistice took effect in Europe.

Indian support for the AlliesEdit

Template:Further

Germany attempted to use Indian nationalism and pan-Islamism to its advantage, instigating uprisings in India, and sending a mission that urged Afghanistan to join the war on the side of Central powers. However, contrary to British fears of a revolt in India, the outbreak of the war saw an unprecedented outpouring of loyalty and goodwill towards Britain. Indian political leaders from the Indian National Congress and other groups were eager to support the British war effort, since they believed that strong support for the war effort would further the cause of Indian Home Rule. The Indian Army in fact outnumbered the British Army at the beginning of the war; about 1.3 million Indian soldiers and labourers served in Europe, Africa, and the Middle East, while the central government and the princely states sent large supplies of food, money, and ammunition. In all, 140,000 men served on the Western Front and nearly 700,000 in the Middle East. Casualties of Indian soldiers totaled 47,746 killed and 65,126 wounded during the World War.

The suffering engendered by the war, as well as the failure of the British government to grant self-government to India after the end of hostilities, bred disillusionment and fuelled the campaign for full independence that would be led by Mohandas K. Gandhi and others.

Western FrontEdit

Trench warfare beginsEdit

Mud stained British soldiers at rest

Royal Irish Rifles in a communications trench, first day on the Somme, 1916

Military tactics developed before the World War failed to keep pace with advances in technology and had become obsolete. These advances had allowed the creation of strong defensive systems, which out-of-date military tactics could not break through for most of the war. Barbed wire was a significant hindrance to massed infantry advances, while artillery, vastly more lethal than in the 1870s, coupled with machine gun, made crossing open ground extremely difficult. Commanders on both sides failed to develop tactics for breaching entrenched positions without heavy casualties. In time, however, technology began to produce new offensive weapons, such as gas warfare and the tank.

Just after the First Battle of the Marne (5–12 September 1914), Entente and German forces repeatedly attempted maneuvering to the north in an effort to outflank each other: this series of maneuvers became known as the "Race to the Sea". When these outflanking efforts failed, the opposing forces soon found themselves facing an uninterrupted line of entrenched positions from Lorraine to Belgium's coast. Britain and France sought to take the offensive, while Germany defended the occupied territories. Consequently, German trenches were much better constructed than those of their enemy; Anglo-French trenches were only intended to be "temporary" before their forces broke through the German defences.

Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the Second Battle of Ypres, the Germans used chlorine gas for the first time on the Western Front. Several types of gas soon became widely used by both sides, and though it never proved a decisive, battle-winning weapon, poison gas became one of the most-feared and best-remembered horrors of the war. Tanks were developed by Britain and France, and were first used in combat by the British during the Battle of Flers–Courcelette (part of the Battle of the Somme) on 15 September 1916, with only partial success. However, their effectiveness would grow as the war progressed; the Entente built tanks in large numbers, whilst the Germans employed only a few of their own design, supplemented by captured Entente tanks.

Continuation of trench warfareEdit

French 87th Regiment Cote 34 Verdun 1916

French 87th regiment near Verdun, 1916

King George V and officials inspecting munitions factory in 1917

King George V (front left) and a group of officials inspect a British munitions factory in 1917

Files of soldiers with rifles slung follow close behind a tank, there is a dead body in the foreground

Canadian troops advancing with a British Mark II tank at the Battle of Vimy Ridge, 1917

Neither side proved able to deliver a decisive blow for the next two years. Throughout 1915–17, the British Empire and France suffered more casualties than Germany, because of both the strategic and tactical stances chosen by the sides. Strategically, while the Germans only mounted one major offensive, the Entente made several attempts to break through the German lines.

In February 1916 the Germans attacked the French defensive positions at Verdun. Lasting until December 1916, the battle saw initial German gains, before French counter-attacks returned matters to near their starting point. Casualties were greater for the French, but the Germans bled heavily as well, with anywhere from 700,000 to 975,000 casualties suffered between the two combatants. Verdun became a symbol of French determination and self-sacrifice.

The Battle of the Somme was an Anglo-French offensive of July to November 1916. The opening of this offensive (1 July 1916) saw the British Army endure the bloodiest day in its history, suffering 57,470 casualties, including 19,240 dead, on the first day alone. The entire Somme offensive cost the British Army some 420,000 casualties. The French suffered another estimated 200,000 casualties and the Germans an estimated 500,000.

Protracted action at Verdun throughout 1916, combined with the bloodletting at the Somme, brought the exhausted French army to the brink of collapse. Futile attempts using frontal assault came at a high price for both the British and the French and led to the widespread French Army Mutinies, after the failure of the costly Nivelle Offensive of April–May 1917. The concurrent British Battle of Arras was more limited in scope, and more successful, although ultimately of little strategic value. A smaller part of the Arras offensive, the capture of Vimy Ridge by the Canadian Corps, became highly significant to that country: the idea that Canada's national identity was born out of the battle is an opinion widely held in military and general histories of Canada.

The last large-scale offensive of this period was a British attack (with French support) at Passchendaele (July–November 1917). This offensive opened with great promise for the Entente, before bogging down in the October mud. Casualties, though disputed, were roughly equal, at some 200,000–400,000 per side.

These years of trench warfare in the West saw no major exchanges of territory and, as a result, are often thought of as static and unchanging. However, throughout this period, British, French, and German tactics constantly evolved to meet new battlefield challenges.

Naval warEdit

Hochseeflotte 2

Battleships of the Hochseeflotte, 1917

At the start of the war, the German Empire had cruisers scattered across the globe, some of which were subsequently used to attack Entente merchant shipping. The British Royal Navy systematically hunted them down, though not without some embarrassment from its inability to protect Entente shipping. For example, the German detached light cruiser SMS Emden, part of the East-Asia squadron stationed at Qingdao, seized or destroyed 15 merchantmen, as well as sinking a Russian cruiser and a French destroyer. However, most of the German East-Asia squadron—consisting of the armoured cruisers SMS Scharnhorst and Gneisenau, light cruisers Nürnberg and Leipzig and two transport ships—did not have orders to raid shipping and was instead underway to Germany when it met British warships. The German flotilla and Dresden sank two armoured cruisers at the Battle of Coronel, but was virtually destroyed at the Battle of the Falkland Islands in December 1914, with only Dresden and a few auxiliaries escaping, but after the Battle of Más a Tierra these too had been destroyed or interned.

Soon after the outbreak of hostilities, Britain began a naval blockade of Germany. The strategy proved effective, cutting off vital military and civilian supplies, although this blockade violated accepted international law codified by several international agreements of the past two centuries. Britain mined international waters to prevent any ships from entering entire sections of ocean, causing danger to even neutral ships. Since there was limited response to this tactic of the British, Germany expected a similar response to its unrestricted submarine warfare.

The Battle of Jutland (German: Skagerrakschlacht, or "Battle of the Skagerrak") developed into the largest naval battle of the war. It was the only full-scale clash of battleships during the war, and one of the largest in history. The Kaiserliche Marine's High Seas Fleet, commanded by Vice Admiral Reinhard Scheer, fought the Royal Navy's Grand Fleet, led by Admiral Sir John Jellicoe. The engagement was a stand off, as the Germans were outmanoeuvred by the larger British fleet, but managed to escape and inflicted more damage to the British fleet than they received. Strategically, however, British control of the sea was weakened, and the bulk of the German surface fleet remained confined to port for the duration of the war.

German U-boats attempted to cut the supply lines between North America and Britain. The nature of submarine warfare meant that attacks often came without warning, giving the crews of the merchant ships little hope of survival. The United States launched a protest, and Germany changed its rules of engagement. After the sinking of the passenger ship RMS Lusitania in 1915, Germany promised not to target passenger liners, while Britain armed its merchant ships, placing them beyond the protection of the "cruiser rules", which demanded warning and movement of crews to "a place of safety" (a standard that lifeboats did not meet).

The U-boat threat lessened in 1917, when merchant ships began travelling in convoys, escorted by destroyers. This tactic made it difficult for U-boats to find targets, which significantly lessened losses; after the hydrophone and depth charges were introduced, accompanying destroyers could attack a submerged submarine with some hope of success. Convoys slowed the flow of supplies, since ships had to wait as convoys were assembled. The solution to the delays was an extensive program of building new freighters. Troopships were too fast for the submarines and did not travel the North Atlantic in convoys. The U-boats had sunk more than 5,000 Entente ships, at a cost of 199 submarines. The World War also saw the first use of aircraft carriers in combat, with HMS Furious launching Sopwith Camels in a successful raid against the Zeppelin hangars at Tondern in July 1918, as well as blimps for antisubmarine patrol.

Southern theatresEdit

War in the BalkansEdit

Austrians executing Serbs 1917

Austro-Hungarian troops executing captured Serbians, 1917. Serbia lost about 850,000 people during the war, a quarter of its pre-war population.

Bulgaria southern front

Bulgarian soldiers in a trench, preparing to fire against an incoming airplane.

Flüchtlingstransport Leibnitz - k.k. Innenministerium - 1914

Refugee transport from Serbia in Leibnitz, Styria, 1914

Faced with Russia, Austria-Hungary could spare only one-third of its army to attack Serbia. After suffering heavy losses, the Austrians briefly occupied the Serbian capital, Belgrade. A Serbian counter-attack in the Battle of Kolubara succeeded in driving them from the country by the end of 1914. For the first ten months of 1915, Austria-Hungary used most of its military reserves to fight Italy. German and Austro-Hungarian diplomats, however, scored a coup by persuading Bulgaria to join the attack on Serbia. The Austro-Hungarian provinces of Slovenia, Croatia and Bosnia provided troops for Austria-Hungary, in the fight with Serbia, Russia and Italy. Montenegro allied itself with Serbia.

Bulgaria declared war on Serbia, 12 October and joined in the attack by the Austro-Hungarian army under Mackensen's army of 250,000 that was already underway. Serbia was conquered in a little more than a month, as the Central Powers, now including Bulgaria, sent in 600,000 troops total. The Serbian army, fighting on two fronts and facing certain defeat, retreated into northern Albania. The Serbs suffered defeat in the Battle of Kosovo. Montenegro covered the Serbian retreat towards the Adriatic coast in the Battle of Mojkovac in 6–7 January 1916, but ultimately the Austrians also conquered Montenegro. The surviving Serbian soldiers were evacuated by ship to Greece. After conquest, Serbia was divided between Austria-Hungary and Bulgaria.

In late 1915, a Franco-British force landed at Salonica in Greece, to offer assistance and to pressure its government to declare war against the Central Powers. However, the pro-German King Constantine I dismissed the pro-Entente government of Eleftherios Venizelos before the Entente expeditionary force arrived. The friction between the King of Greece and the Entente continued to accumulate with the National Schism, which effectively divided Greece between regions still loyal to the king and the new provisional government of Venizelos in Salonica. After intense negotiations and an armed confrontation in Athens between Entente and royalist forces (an incident known as Noemvriana), the King of Greece resigned and his second son Alexander took his place; Greece then officially joined the war on the side of the Entente.

In the beginning, the Macedonian Front was mostly static. French and Serbian forces retook limited areas of Macedonia by recapturing Bitola on 19 November 1916 following the costly Monastir Offensive, which brought stabilization of the front.

Serbian troops finally surrendered in September 1918, after most of the French and British troops had been withdrawn. The Bulgarians repulsed a final Entente offensive at the Battle of Dobro Pole and by 25 September 1918 the Greek army collapsed. Greece capitulated four days later, on 29 September 1918.

Ottoman EmpireEdit

File:Scene just before the evacuation at Anzac. Australian troops charging near a Turkish trench. When they got there the... - NARA - 533108.tif
Sultan Mehmed V of Turkey greeting Kaiser Wilhelm II on his arrival at Constantinople

Mehmed V greeting Wilhelm II on his arrival at Constantinople

Ottoman 15th Corps

Kaiser Wilhelm II inspecting Turkish troops of the 15th Corps in East Galicia, Austria-Hungary (now Poland). Prince Leopold of Bavaria, the Supreme Commander of the German Army on the Eastern Front, is second from the left.

Sarikam

Russian forest trench at the Battle of Sarikamish, 1914–1915

The Ottomans threatened Russia's Caucasian territories and Britain's communications with India via the Suez Canal. As the conflict progressed, the Ottoman Empire took advantage of the European powers' preoccupation with the war and conducted large-scale ethnic cleansing of the indigenous Armenian, Greek, and Assyrian Christian populations, known as the Armenian Genocide, Greek Genocide, and Assyrian Genocide.

The British and French opened overseas fronts with the Gallipoli (1915) and Mesopotamian campaigns (1914). In Gallipoli, the Ottoman Empire successfully repelled the British, French, and Australian and New Zealand Army Corps (ANZACs). In Mesopotamia, by contrast, after the defeat of the British defenders in the Siege of Kut by the Ottomans (1915–16), British Imperial forces reorganised and captured Baghdad in March 1917. The British were aided in Mesopotamia by local Arab and Assyrian tribesmen, while the Ottomans employed local Kurdish and Turcoman tribes.

Further to the west, the Suez Canal was defended from Ottoman attacks in 1915 and 1916; in August, a German and Ottoman force was defeated at the Battle of Romani by the ANZAC Mounted Division and the 52nd (Lowland) Infantry Division. Following this victory, an Egyptian Expeditionary Force advanced across the Sinai Peninsula, pushing Ottoman forces back in the Battle of Magdhaba in December and the Battle of Rafa on the border between the Egyptian Sinai and Ottoman Palestine in January 1917.

Russian armies generally saw success in the Caucasus. Enver Pasha, supreme commander of the Ottoman armed forces, was ambitious and dreamed of re-conquering central Asia and areas that had been lost to Russia previously. He was, however, a poor commander. He launched an offensive against the Russians in the Caucasus in December 1914 with 100,000 troops, insisting on a frontal attack against mountainous Russian positions in winter. He lost 86% of his force at the Battle of Sarikamish.

The Ottoman Empire, with German support, invaded Persia in December 1914 in an effort to cut off British and Russian access to petroleum reservoir around Baku near the Caspian Sea. Persia, ostensibly neutral, had long been under the spheres of British and Russian influence. The Ottomans and Germans were aided by Kurdish and Azeri forces, together with a large number of major Iranian tribes, such as the Qashqai, Tangistani, Luristani, and Khamseh, while the Russians and British had the support of Armenian and Assyrian forces. The Persian Campaign was to last until 1918 and end in failure for the Ottomans and their allies. However the Russian withdrawal from the war in 1917 led to Armenian and Assyrian forces, who had hitherto inflicted a series of defeats upon the forces of the Ottomans and their allies, being cut off from supply lines, outnumbered, outgunned and isolated, forcing them to fight and flee towards British lines in northern Mesopotamia.

General Yudenich, the Russian commander from 1915 to 1916, drove the Turks out of most of the southern Caucasus with a string of victories. In 1917, Russian Grand Duke Nicholas assumed command of the Caucasus front. Nicholas planned a railway from Russian Georgia to the conquered territories, so that fresh supplies could be brought up for a new offensive in 1917. However, in March 1917 (February in the pre-revolutionary Russian calendar), the Tsar abdicated in the course of the February Revolution and the Russian Caucasus Army began to fall apart.

The Arab Revolt, instigated by the Arab bureau of the British Foreign Office, started June 1916 with the Battle of Mecca, led by Sherif Hussein of Mecca, and ended with the Ottoman surrender of Damascus. Fakhri Pasha, the Ottoman commander of Medina, resisted for more than two and half years during the Siege of Medina before surrendering.

The Senussi tribe, along the border of Italian Libya and British Egypt, incited and armed by the Turks, waged a small-scale guerrilla war against Entente troops. The British were forced to dispatch 12,000 troops to oppose them in the Senussi Campaign. Their rebellion was finally crushed in mid-1916.

Total Entente casualties on the Ottoman fronts amounted 650,000 men. Total Ottoman casualties were 725,000 (325,000 dead and 400,000 wounded).

Italian participationEdit

Interventisti Bologna 1914

A pro-war demonstration in Bologna, 1914.

Italy had been allied with the German and Austro-Hungarian Empires since 1882 as part of the Triple Alliance. However, the nation had its own designs on Austrian territory in Trentino, the Austrian Littoral, Fiume and Dalmatia. Rome had a secret 1902 pact with France, effectively nullifying its part in the Triple Alliance. At the start of hostilities, Italy refused to commit troops, arguing that the Triple Alliance was defensive and that Austria-Hungary was an aggressor. The Austro-Hungarian government began negotiations to secure Italian neutrality, offering the French colony of Tunisia in return. The Entente made a counter-offer in which Italy would receive the Southern Tyrol, Austrian Littoral and territory on the Dalmatian coast after the defeat of Austria-Hungary. This was formalised by the Treaty of London. Further encouraged by the Entente invasion of Turkey in April 1915, Italy joined the Triple Entente and declared war on Austria-Hungary on 23 May. Fifteen months later, Italy declared war on Germany.

Austro-Hungarian mountain corps

Austro-Hungarian troops, Tyrol.

The Italians had numerical superiority but this advantage was lost, not only because of the difficult terrain in which the fighting took place, but also because of the strategies and tactics employed. General Luigi Cadorna, a staunch proponent of the frontal assault, had dreams of breaking into the Slovenian plateau, taking Ljubljana and threatening Vienna.

On the Trentino front, the Austro-Hungarians took advantage of the mountainous terrain, which favoured the defender. After an initial strategic retreat, the front remained largely unchanged, while Austrian Kaiserschützen and Standschützen engaged Italian Alpini in bitter hand-to-hand combat throughout the summer. The Austro-Hungarians counterattacked in the Altopiano of Asiago, towards Verona and Padua, in the spring of 1916 (Strafexpedition), but made little progress.

Beginning in 1915, the Italians under Cadorna mounted eleven offensives on the Isonzo front along the Isonzo River, northeast of Trieste. All eleven offensives were repelled by the Austro-Hungarians, who held the higher ground. In the summer of 1916, after the Battle of Doberdò, the Italians captured the town of Gorizia. After this minor victory, the front remained static for over a year, despite several Italian offensives, centred on the Banjšice and Karst Plateau east of Gorizia.

Kämpfe auf dem Doberdo

Depiction of the Battle of Doberdò, fought in August 1916 between the Italian and the Austro-Hungarian armies

The Central Powers launched a crushing offensive on 26 October 1917, spearheaded by the Germans. They achieved a victory at Caporetto. The Italian Army was routed and retreated more than 100 kilometres (62 mi) to reorganise, stabilising the front at the Piave River. Since the Italian Army had suffered heavy losses in the Battle of Caporetto, the Italian Government called to arms the so-called Template:'99 Boys (Ragazzi del '99): that is, all males born 1899 and prior, and so were 18 years old or older. In 1918, the Austro-Hungarians failed to break through in a series of battles on the Piave. On 20 August, the Armistice of Buonconsiglio Castle was signed. By mid-September 1918, the Austro-Hungarian military occupied Italy north of the Brenta river.

Romanian participationEdit

Marshal Joffre inspecting Romanian troops during WWI

Marshal Joffre inspecting Romanian troops, 1916

Romanian troops at Marasesti in 1917

Romanian troops during the Battle of Mărăşeşti, 1917

Romania had been allied with the Central Powers since 1882. When the war began, however, it declared its neutrality, arguing that because Austria-Hungary had itself declared war on Serbia, Romania was under no obligation to join the war. When the Entente Powers promised Romania Transylvania and Banat, large territories of eastern Hungary, in exchange for Romania's declaring war on the Central Powers, the Romanian government renounced its neutrality. On 27 August 1916, the Romanian Army launched an attack against Austria-Hungary, with limited Russian support. The Romanian offensive was initially successful, against the Austro-Hungarian troops in Transylvania, but a counterattack by the forces of the Central Powers drove them back. As a result of the Battle of Bucharest, the Central Powers occupied Bucharest on 6 December 1916. Fighting in Moldova continued in 1917, resulting in a costly stalemate for the Central Powers. Russian withdrawal from the war in late 1917 as a result of the October Revolution meant that Romania was forced to sign an armistice with the Central Powers on 9 December 1917.

In January 1918, Romanian forces established control over Bessarabia as the Russian Army abandoned the province. Although a treaty was signed by the Romanian and the Bolshevik Russian governments following talks between 5 and 9 March 1918 on the withdrawal of Romanian forces from Bessarabia within two months, on 27 March 1918 Romania attached Bessarabia to its territory, formally based on a resolution passed by the local assembly of that territory on its unification with Romania.

Romania officially made peace with the Central Powers by signing the Treaty of Bucharest on 7 May 1918. Under that treaty, Romania was obliged to end the war with the Central Powers and make small territorial concessions to Austria-Hungary, ceding control of some passes in the Carpathian Mountains, and to grant oil concessions to Germany. In exchange, the Central Powers recognised the sovereignty of Romania over Bessarabia. Total Romanian deaths from 1914 to 1918, military and civilian, within contemporary borders, were estimated at 748,000.

Eastern FrontEdit

Nastepca tronu w twierdzy przemysl

Heir presumptive Karl visiting the fortress of Przemyśl after the first siege. The Russian Siege of Przemyśl was the longest siege of the war.

Initial actionsEdit

While the Western Front had reached stalemate, the war continued in Eastern Europe. Initial Russian plans called for simultaneous invasions of Austrian Galicia and East Prussia. Although Russia's initial advance into Galicia was largely successful, it was driven back from East Prussia by Hindenburg and Ludendorff at the battles of Tannenberg and the Masurian Lakes in August and September 1914. Russia's less developed industrial base and ineffective military leadership were instrumental in the events that unfolded. By the spring of 1915, the Russians had retreated to Galicia, and, in May, the Central Powers achieved a remarkable breakthrough on Poland's southern frontiers. On 5 August, they captured Warsaw and forced the Russians to withdraw from Poland.

Russian RevolutionEdit

Brest-litovsk treaty

Treaty of Brest-Litovsk, 1918.

  1. Count Ottokar von Czernin
  2. Richard von Kühlmann
  3. Vasil Radoslavov

Despite Russia's success with the June 1916 Brusilov Offensive in eastern Galicia, dissatisfaction with the Russian government's conduct of the war grew. The offensive's success was undermined by the reluctance of other generals to commit their forces to support the victory. Entente and Russian forces were revived only temporarily by Romania's entry into the war on 27 August. German forces came to the aid of embattled Austro-Hungarian units in Transylvania while a German-Bulgarian force attacked from the south, and Bucharest was retaken by the Central Powers on 6 December. Meanwhile, unrest grew in Russia, as the Tsar remained at the front. Empress Alexandra's increasingly incompetent rule drew protests and resulted in the murder of her favourite, Rasputin, at the end of 1916.

In March 1917, demonstrations in Petrograd culminated in the abdication of Tsar Nicholas II and the appointment of a weak Provisional Government, which shared power with the Petrograd Soviet socialists. This arrangement led to confusion and chaos both at the front and at home. The army became increasingly ineffective.

Following the Tsar's abdication, Vladimir Lenin was ushered by train from Switzerland into Russia 16 April 1917. He was financed by Jacob Schiff. Discontent and the weaknesses of the Provisional Government led to a rise in the popularity of the Bolshevik Party, led by Lenin, which demanded an immediate end to the war. The Revolution of November was followed in December by an armistice and negotiations with Germany. At first, the Bolsheviks refused the German terms, but when German troops began marching across Ukraine unopposed, the new government acceded to the Treaty of Brest-Litovsk on 3 March 1918. The treaty ceded vast territories, including Finland, the Baltic provinces, parts of Poland and Ukraine to the Central Powers. Despite this enormous apparent German success, the manpower required for German occupation of former Russian territory contributed endangered the upcomming Spring Offensive and secured relatively little food or other materiel for the Central Powers war effort.

With the adoption of the Treaty of Brest-Litovsk, the Entente no longer existed.

Czechoslovak LegionEdit

Czech Troops

Czechoslovak Legion, Vladivostok, 1918.

The Czechoslovak Legion fought with the Entente; their goal was to win support for the independence of Czechoslovakia. The Legion in Russia was established in September 1914, in December 1917 in France (including volunteers from America) and in April 1918 in Italy. Czechoslovak Legion troops defeated the Austro-Hungarian army at the Ukrainian village of Zborov, in July 1917. After this success, the number of Czechoslovak legionaries increased, as well as Czechoslovak military power. In the Battle of Bakhmach, the Legion defeated the Germans and forced them to make a truce.

In Russia, they were heavily involved in the Russian Civil War, siding with the Whites against the Bolsheviks, at times controlling most of the Trans-Siberian railway and conquering all the major cities of Siberia. The presence of the Czechoslovak Legion near Yekaterinburg appears to have been one of the motivations for the Bolshevik execution of the Tsar and his family in July 1918. Legionaries arrived less than a week afterwards and captured the city. Because Russia's European ports were not safe, the corps was evacuated by a long detour via the port of Vladivostok. The last transport was the American ship Heffron in September 1920.

Central Powers peace overturesEdit

River Crossing NGM-v31-p338

"They shall not pass", a phrase typically associated with the defense of Verdun.

In December 1916, after ten brutal months of the Battle of Verdun and a successful offensive against Romania, the Germans attempted to negotiate a peace with the Entente. Soon after, the U.S. President, Woodrow Wilson, attempted to intervene as a peacemaker, asking in a note for both sides to state their demands. Lloyd George's War Cabinet considered the German offer to be a ploy to create divisions amongst the Entente. After initial outrage and much deliberation, they took Wilson's note as a separate effort, signalling that the United States was on the verge of entering the war against Germany following the "submarine outrages". While the Entente debated a response to Wilson's offer, the Germans chose to rebuff it in favour of "a direct exchange of views". Learning of the German response, the Entente governments were free to make clear demands in their response of 14 January. They sought restoration of damages, the evacuation of occupied territories, reparations for France, Russia and Romania, and a recognition of the principle of nationalities. This included the liberation of Italians, Slavs, Romanians, Czecho-Slovaks, and the creation of a "free and united Poland". On the question of security, the Entente sought guarantees that would prevent or limit future wars, complete with sanctions, as a condition of any peace settlement. The negotiations failed and the Entente powers rejected the German offer, because Germany did not state any specific proposals. The Entente powers stated to Wilson that they would not start peace negotiations until the Central powers evacuated all occupied Entente territories and provided indemnities for all damage that had been done.

1917–1918Edit

Developments in 1917Edit

Guetteur au poste de l'écluse 26

French Army lookout at his observation post, Haut-Rhin, France, 1917.

Bundesarchiv Bild 183-1983-0323-501, Kriegskinematograph im Schützengraben

German film crew recording the action.

Events of 1917 proved decisive in ending the war, although their effects were not fully felt until 1918.

The British naval blockade began lose its effectiveness. In response, in February 1917, the German General Staff tried to convince Chancellor Theobald von Bethmann-Hollweg to declare unrestricted submarine warfare, with the goal of starving Britain out of the war. German planners estimated that unrestricted submarine warfare would cost Britain a monthly shipping loss of 600,000 tons. The General Staff acknowledged that the policy would almost certainly bring the United States into the conflict, but calculated that British shipping losses would be so high that they would be forced to sue for peace after 5 to 6 months, before American intervention could make an impact. In reality, the newly re-introduced convoy system became effective in reducing the U-boat threat, Bethmann-Hollweg knew this and denied the plan. Britain was safe from starvation, while German industrial output fell and the United States remained neutral.

On 3 May 1917, during the Nivelle Offensive, the French 2nd Colonial Division, veterans of the Battle of Verdun, refused orders, arriving drunk and without their weapons. Their officers lacked the means to punish an entire division, and harsh measures were not immediately implemented. The French Army Mutinies eventually spread to a further 54 French divisions and saw 20,000 men desert. However, appeals to patriotism and duty, as well as mass arrests and trials, encouraged the soldiers to return to defend their trenches, although the French soldiers refused to participate in further offensive action. Robert Nivelle was removed from command by 15 May, replaced by General Philippe Pétain, who suspended bloody large-scale attacks.

The victory of the Central Powers at the Battle of Caporetto led the Entente to convene the Rapallo Conference at which they formed the Supreme War Council to coordinate planning. Previously, British and French armies had operated under separate commands.

In December, the Central Powers signed an armistice with Russia, thus freeing large numbers of German troops for use in the west. With German reinforcements pouring in, the outcome was to be decided on the Western Front. The Central Powers knew that they could not win a protracted war, but they held high hopes for success based on a final quick offensive. Furthermore, both sides became increasingly fearful of social unrest and revolution in Europe. Thus, both sides urgently sought a decisive victory.

In 1917, Emperor Charles I of Austria secretly attempted separate peace negotiations with Clemenceau, through his wife's brother Sixtus in Belgium as an intermediary, without the knowledge of Germany. Italy opposed the proposals. When the negotiations failed, his attempt was revealed to Germany, resulting in a diplomatic catastrophe.

Ottoman Empire conflict, 1917–1918Edit

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10.5 cm Feldhaubitze 98/09 and Ottoman artillerymen at Hareira in 1917 before the Southern Palestine offensive.

Ottoman soldiers WWI

Ottoman troops during Mesopotamian campaign.

Capture of Jerusalem 1917d

British artillery battery on Mount Scopus in the Battle of Jerusalem, 1917. Foreground, a battery of 16 heavy guns. Background, conical tents and support vehicles.

British Troops Marching in Mesopotamia

British troops on the march during Mesopotamian campaign, 1917

In March and April 1917, at the First and Second Battles of Gaza, German and Ottoman forces stopped the advance of the Egyptian Expeditionary Force, which had begun in August 1916 at the Battle of Romani. At the end of October, the Sinai and Palestine Campaign resumed, when General Edmund Allenby's XXth Corps, XXI Corps and Desert Mounted Corps won the Battle of Beersheba. Two Ottoman armies were defeated a few weeks later at the Battle of Mughar Ridge and, early in December, Jerusalem was captured following another Ottoman defeat at the Battle of Jerusalem (1917). About this time, Friedrich Freiherr Kress von Kressenstein was relieved of his duties as the Eighth Army's commander, replaced by Djevad Pasha, and a few months later the commander of the Ottoman Army in Palestine, Erich von Falkenhayn, was replaced by Otto Liman von Sanders.

In early 1918, the front line was extended and the Jordan Valley was occupied, following the First Transjordan and the Second Transjordan attack by British Empire forces in March and April 1918. In March, most of the Egyptian Expeditionary Force's British infantry and Yeomanry cavalry were sent to the Western Front as a consequence of the Spring Offensive. They were replaced by Indian Army units. During several months of reorganisation and training of the summer, a number of attacks were carried out on sections of the Ottoman front line. These pushed the front line north to more advantageous positions for the Entente in preparation for an attack and to acclimatise the newly arrived Indian Army infantry.

15 August 1917: Peace offer by the PopeEdit

On or shortly before 15 August 1917 Pope Benedict XV made a peace proposal suggesting:

  • No annexations
  • No indemnities, except to compensate for severe war damage in Belgium and parts of France and of Serbia.
  • A solution to the problems of Alsace-Lorraine and Trentino and Trieste
  • Restoration of the Kingdom of Poland
  • Germany to pull out of Belgium and France
  • Germany's overseas colonies to be returned to Germany
  • General disarmament
  • A Supreme Court of arbitration to settle future disputes between nations
  • The freedom of the seas
  • Abolish all retaliatory economic conflicts
  • No point in ordering reparations, because so much damage had been caused to all belligerents

Neutrality of the United StatesEdit

USA bryter de diplomatiska förbindelserna med Tyskland 3 februari 1917

President Wilson before Congress, speaking about American neutrality on 3 February 1917

At the outbreak of the war, the United States pursued a policy of non-intervention, avoiding conflict while trying to broker a peace. When the German U-boat U-20 sank the British liner RMS Lusitania on 7 May 1915 with 128 Americans among the dead, President Woodrow Wilson insisted that "America is too proud to fight" but demanded an end to attacks on passenger ships. Germany complied. Wilson unsuccessfully tried to mediate a settlement. However, he also repeatedly warned that the United States would not tolerate unrestricted submarine warfare, in violation of international law. Former president Theodore Roosevelt denounced German acts as "piracy". Wilson was narrowly reelected in 1916 as his supporters emphasized "he kept us out of war".

German Spring Offensive of 1918Edit

British 55th Division gas casualties 10 April 1918

British 55th Division soldiers, blinded by tear gas during the Battle of Estaires, 10 April 1918

General gouraud french army world war i machinegun marne 1918

French soldiers under General Gouraud, with machine guns amongst the ruins of a cathedral near the Marne, 1918.

Ludendorff drew up plans (codenamed Operation Michael) for the 1918 offensive on the Western Front. The Spring Offensive sought to divide the British and French forces with a series of feints and advances. The operation commenced on 21 March 1918, with an attack on British forces near Saint-Quentin. German forces achieved an unprecedented advance of 60 kilometres (37 mi).

British and French trenches were penetrated using novel infiltration tactics, also named Hutier tactics, after General Oskar von Hutier, by specially trained units called stormtroopers. Previously, attacks had been characterised by long artillery bombardments and massed assaults. However, in the Spring Offensive of 1918, Ludendorff used artillery only briefly and infiltrated small groups of infantry at weak points. They attacked command and logistics areas and bypassed points of serious resistance. More heavily armed infantry then destroyed these isolated positions. This German success relied greatly on the element of surprise.

The front moved to within 120 kilometres (75 mi) of Paris. Three heavy Krupp railway guns fired 183 shells on the capital, causing many Parisians to flee. The initial offensive was so successful that Kaiser Wilhelm II declared 24 March a national holiday. Many Germans thought victory was near. After heavy fighting, however, the offensive was halted. Despite lacking tanks or motorised artillery, the Germans were able to consolidate their gains. The problems of re-supply were also exacerbated by increasing distances that now stretched over terrain that was shell-torn and often impassable to traffic.

A Supreme War Council of Entente forces was created at the Doullens Conference on 5 November 1917. General Foch was appointed as supreme commander of the Entente forces. Haig and Petain retained tactical control of their respective armies; Foch assumed a coordinating rather than a directing role, and the British and French commands operated largely independently.

Following Operation Michael, Germany launched Operation Georgette against the northern English Channel ports. The Entente halted the drive at St. Omer after substantial territorial gains by Germany. The German Army to the south then conducted Operations Blücher and Yorck, pushing broadly towards Paris. Germany then launched Operation Marne (Second Battle of the Marne) 15 July, encircling Reims. The resulting counterattack, which started in Soissons, marked the final Entente offensive of the war.

By 20 July, the Germans had advanced 575 mi (925 km) beyond to their starting lines, having achieved a decisive breakthrough, and the German Army entrenched itself into a new forward position. German casualties between March and April 1918 were 270,000, including many highly trained storm troopers.

New states under war zoneEdit

In the late spring of 1918, three new states were formed in the South Caucasus: the First Republic of Armenia, the Azerbaijan Democratic Republic, and the Democratic Republic of Georgia, which declared their independence from the Russian Empire. Two other minor entities were established, the Centrocaspian Dictatorship and South West Caucasian Republic (the former was liquidated by Azerbaijan in the autumn of 1918 and the latter by a joint Armenian task force in early 1919). With the withdrawal of the Russian armies from the Caucasus front in the winter of 1917–18, the three major republics braced for an imminent Ottoman advance, which commenced in the early months of 1918. Solidarity was briefly maintained when the Transcaucasian Federative Republic was created in the spring of 1918, but this collapsed in May, when the Georgians asked for and received protection from Germany and the Azerbaijanis concluded a treaty with the Ottoman Empire that was more akin to a military alliance. Armenia was left to fend for itself and struggled for five months against the threat of a full-fledged occupation by the Ottoman Turks before defeating them at the Battle of Sardara

ArmisticeEdit

ProclamaciónDeLaRepúblicaEnBerlín10 11 1918

Citizens of Berlin celebrate the news of the Armistice, 12 September 1918.

The Entente counter attacks failed with the defenders displaying a marked collapse in morale. Entente resistance stiffened in late July stopping the advance 95 mi (153 km) from Paris, the French government realised that the war was lost and made attempts to reach a satisfactory end. On 20 July the French government evacuated to Bordeaux. On 27 July Clemenceau was replaced by Aristide Briand as Prime Minister. On 29 July, at Abbeville, the Supreme War Council agreed that the war could not be ended militarily and, on the following day, the British War Cabinet decided that victory in the field was now most improbable. France warned that they could only continue the war until December, and Petain recommended immediate peace negotiations. On 26 August France sent a note to all belligerents and neutrals suggesting a meeting for peace talks on neutral soil. On 12 September, at 5:00 am, an armistice with the Entente was signed in a railroad carriage at Arras. At 11 am on 12 September 1918 a ceasefire came into effect.