World War I

Clockwise from top: trenches on the Western Front; a British Mark IV Tank crossing a trench; Royal Navy battleship HMS Irresistible sinking after striking a mine at the Battle of the Dardanelles; a Vickers machine gun crew with gas masks, and German Albatros D.III biplanes

Date28 July 1914 ? 11 November 1918 (Armistice)
Treaty of Versailles signed 28 June 1919
(4 years and 11 months)
Treaty of Saint-Germain-en-Laye signed 10 September 1919
Treaty of Neuilly-sur-Seine signed 27 November 1919
Treaty of Trianon signed 4 June 1920
Treaty of Sevres signed 10 August 1920
LocationEurope, Africa, the Middle East, the Pacific Islands, China and off the coast of South and North America
ResultAllied victory

End of the German, Russian, Ottoman, and Austro-Hungarian empires

Formation of new countries in Europe and the Middle East

Transfer of German colonies and regions of the former Ottoman Empire to other powers

Establishment of the League of Nations. (more...)


Belligerents
Allied (Entente) Powers

 France
 British Empire

 United Kingdom

 Australia

 Canada

 British Raj

 Newfoundland

 New Zealand

 Union of South Africa

 Russian Empire (1914?17)
 Kingdom of Italy (1915?18)
 United States (1917?18)
 Kingdom of Serbia
 Kingdom of Romania (1916?18)
 Empire of Japan
 Belgium
 Kingdom of Greece (1917?18)
 Portugal (1916?18)
...and othersCentral Powers

 German Empire
 Austria-Hungary
 Ottoman Empire
 Kingdom of Bulgaria (1915?18)

Co-belligerents
Jabal Shammar
...and others
Commanders and leaders
Raymond Poincare

George V
Nicholas II
Victor Emmanuel III
Woodrow Wilson
Ferdinand
Taish?
Peter I
Albert I
...and others Wilhelm II

Franz Joseph I (1914?16)
Karl I (1916?18)
Mehmed V (1914?18)
Mehmed VI (1918)
Ferdinand I
...and others
Strength
[1]

12,000,000

8,841,541[2][3]

8,660,000[4]

5,615,140

4,743,826

1,234,000

800,000

707,343

380,000

250,000

Total: 42,959,850[1]

13,250,000

7,800,000

2,998,321

1,200,000

Total: 25,248,321
Casualties and losses
Military dead:
5,525,000
Military wounded:
12,831,500
Military missing:
4,121,000
Total:
22,477,500 KIA, WIA or MIA ...further details.Military dead:
4,386,000
Military wounded:
8,388,000
Military missing:
3,629,000
Total:
16,403,000 KIA, WIA or MIA ...further details.

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Theatres of World War I


European