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The Entente PowersEdit

Note: The "Entente Powers" are also known as the Allies of World War I or the Allies

The Central PowersEdit

Neutral countriesEdit

Declarations of warEdit

Map Europe alliances 1914-en

European military alliances prior to the war.

World War I 1914 08 04

Allies and Central Powers, early August 1914.

World War I 1918 05

Allies and Central Powers, mid 1918.

The following table shows the timeline of the several declarations of war among the belligerent powers. Entries on a yellow background show severed diplomatic relations only, not actual declarations of war.

Date Declarer On
1914
July 28 Flag of Austria-Hungary (1869-1918) Austria-Hungary State Flag of Serbia (1882-1918) Serbia
August 1 Flag of the German Empire Germany Flag of Russia Russia
August 3 Flag of the German Empire Germany Flag of France France
August 4 Flag of the German Empire Germany Flag of Belgium Belgium
Flag of the United Kingdom United Kingdom Flag of the German Empire Germany
August 5 Flag of the Kingdom of Montenegro Montenegro Flag of Austria-Hungary (1869-1918) Austria-Hungary
August 6 Flag of Austria-Hungary (1869-1918) Austria-Hungary Flag of Russia Russia
State Flag of Serbia (1882-1918) Serbia Flag of the German Empire Germany
August 9 Flag of the Kingdom of Montenegro Montenegro Flag of the German Empire Germany
August 11 Flag of France France Flag of Austria-Hungary (1869-1918) Austria-Hungary
August 12 Flag of the United Kingdom United Kingdom Flag of Austria-Hungary (1869-1918) Austria-Hungary
August 22 Flag of Austria-Hungary (1869-1918) Austria-Hungary Flag of Belgium Belgium
August 23 Merchant flag of Japan (1870) Japan Flag of the German Empire Germany
August 25 Merchant flag of Japan (1870) Japan Flag of Austria-Hungary (1869-1918) Austria-Hungary
November 1 Flag of Russia Russia Flag of the Ottoman Empire Ottoman Empire
November 2 State Flag of Serbia (1882-1918) Serbia Flag of the Ottoman Empire Ottoman Empire
November 3 Flag of the Kingdom of Montenegro Montenegro Flag of the Ottoman Empire Ottoman Empire
November 5 Flag of the United Kingdom United Kingdom
Flag of France France
Flag of the Ottoman Empire Ottoman Empire
1915
May 23 Flag of Italy (1861-1946) crowned Italy Flag of Austria-Hungary (1869-1918) Austria-Hungary
June 3 Flag of San Marino San Marino Flag of Austria-Hungary (1869-1918) Austria-Hungary
August 21 Flag of Italy (1861-1946) crowned Italy Flag of the Ottoman Empire Ottoman Empire
October 14 Flag of Bulgaria Bulgaria State Flag of Serbia (1882-1918) Serbia
October 15 Flag of the United Kingdom United Kingdom
Flag of the Kingdom of Montenegro Montenegro
Flag of Bulgaria Bulgaria
October 16 Flag of France France Flag of Bulgaria Bulgaria
October 19 Flag of Italy (1861-1946) crowned Italy
Flag of Russia Russia
Flag of Bulgaria Bulgaria
1916
March 9 Flag of the German Empire Germany Flag of Portugal Portugal
March 15 Flag of Austria-Hungary (1869-1918) Austria-Hungary Flag of Portugal Portugal
August 27 Flag of Romania Romania Flag of Austria-Hungary (1869-1918) Austria-Hungary
Flag of Italy (1861-1946) crowned Italy Flag of the German Empire Germany
August 28 Flag of the German Empire Germany Flag of Romania Romania
August 30 Flag of the Ottoman Empire Ottoman Empire Flag of Romania Romania
November 1 Flag of Bulgaria Bulgaria Flag of Romania Romania
1917
July 2 State Flag of Greece (1863-1924 and 1935-1970) Greece 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
July 22 Flag of Thailand (1916) Siam Flag of the German Empire Germany
Flag of Austria-Hungary (1869-1918) Austria-Hungary
Flag of the Ottoman Empire Ottoman Empire
August 14 Flag of the Republic of China (1912-1928) China Flag of the German Empire Germany
Flag of Austria-Hungary (1869-1918) Austria-Hungary
October 26 Flag of Brazil (1889-1960) Brazil Flag of the German Empire Germany