Date 28 July 1914 – 11 November 1918 (1914-07-28 – 1918-11-11 ) (4 years, 3 months and 2 weeks) Peace treaties
Treaty of Versailles Signed 28 June 1919
(4 years and 11 months)
Treaty of Saint-Germain-en-Laye Signed 10 September 1919
(5 years, 1 month, 1 week and 6 days)
Treaty of Neuilly-sur-Seine Signed 27 November 1919
(4 years, 1 month, 1 week and 6 days)
Treaty of Trianon Signed 4 June 1920
(5 years, 10 months and 1 week)
Treaty of Sèvres Signed 10 August 1920
(6 years, 1 week and 6 days)
United States–Austria Peace Treaty Signed 24 August 1921
(3 years, 8 months, 2 weeks and 3 days)
United States–Germany Peace Treaty Signed 25 August 1921
(4 years, 4 months, 2 weeks and 5 days)
United States–Hungary Peace Treaty Signed 29 August 1921
(3 years, 8 months, 3 weeks and 1 day)
Treaty of Lausanne Signed 24 July 1923
(8 years, 8 months, 3 weeks and 4 days)
Location Result Allied victory
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
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 50,000Total: 25,248,321 13,250,000 7,800,000 2,998,321 1,200,000Military dead : 5,525,000Military wounded : 12,831,500Total: 18,356,500 KIA, WIA and MIACivilian dead: 4,000,000further 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 415Military dead: 4,386,000Military wounded: 8,388,000Total: 12,774,000 KIA, WIA and MIACivilian dead: 3,700,000further details ...
Military deaths by country
2,050,897 1,200,000 771,844 87,500