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World War I
	; (Clockwise from the top) The aftermath of shelling during the Battle of the Somme; Mark V tanks cross the Hindenburg 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 November 1918; (4 years, 3 months and 2 weeks) Peace treaties
Location	Europe; Middle East; Africa; Pacific; Atlantic; Mediterranean and Adriatic;
Result	Allied victory Central Powers victory on the Eastern Front is made worthless by defeat on the Western Front; All empires in mainland Europe collapse (including Germany, Russia, Turkey and Austria-Hungary); Russian Revolution and Russian Civil War – the Russian Empire becomes the Soviet Union; Widespread unrest and revolutions throughout Europe and Asia; Creation of the League of Nations (more...);
Territorial; changes	Formation of new countries in Europe and the Middle East; Transfer of German colonies and territories, regions of the former Ottoman Empire, regions of the former Austro-Hungarian Empire and Soviet Union territories to other countries;
Belligerents
Allied Powers: France; (1914-1918) British Empire; (1914-1918) Russia; (1914–1917) Serbia; (1914-1918) Belgium; (1914-1918) Montenegro; (1914-1918) Empire of Japan; (1914-1918) Italy; (1915–1918) United States (1917–1918); Romania; (1916–1918) Hejaz; (1916–1918) China; (1917–1918) Greece; (1917–1918) Siam; (1917–1918) ...and others;	Central Powers: German Empire; (1914-1918) Austria-Hungary; (1914-1918) Ottoman Empire; (1914-1918) Kingdom of Bulgaria; (1915-1918) ...and co-belligerents;
Commanders and leaders
Raymond Poincaré; Georges Clemenceau; Joseph Joffre; Philippe Pétain; George V; H. H. Asquith; David Lloyd George; Albert I; Nicholas II; Alexander Kerensky; Victor Emmanuel III; Vittorio Orlando; Woodrow Wilson; Yoshihito; Peter I; Ferdinand I; Eleftherios Venizelos; and others...	Wilhelm II; Franz Joseph I †; Karl I; Mehmed V †; Mehmed VI; Three Pashas; Ferdinand I; and others...
Strength
Total: 42,959,850 12,000,000; 8,841,541; 8,660,000; 5,615,140; 4,743,826; 1,234,000; 800,000; 707,343; 380,000; 250,000; 50,000;	Total: 25,248,321 13,250,000; 7,800,000; 2,998,321; 1,200,000;
Casualties and losses
Military dead: 5,525,000; Military wounded: 12,831,500; Total: 18,356,500 KIA, WIA and MIA; Civilian dead: 4,000,000; further details... Military deaths by country; 1,811,000; 1,397,800; 1,114,914; 651,000; 250,000–335,000; 275,000; 116,708; 58,637–87,500; 26,000; 3,000; 415;	Military dead: 4,386,000; Military wounded: 8,388,000; Total: 12,774,000 KIA, WIA and MIA; Civilian dead: 3,700,000; further details... Military deaths by country; 2,050,897; 1,200,000; 771,844; 87,500;

Map of Europe at the start of World War I. Turkey refers to the Ottoman Empire

World War I (WWI or WW1), also called the First World War, began on July 28, 1914 and lasted until November 11, 1918. It was a global war and lasted exactly 4 years, 3 months and 2 weeks. Most of the fighting was in continental Europe.

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