Great European War
Date 28 July 1914 – 11 November 1918
Location Europe, Africa, the Middle East and the Pacific Islands
  • Central victory
  • Transfer of British and French colonies to the German and Austro-Hungarian empire
  • End of the British, French and Russian empires
  • Establishment of the League of Nations
Allied Powers
Flag of France France
Flag of the United Kingdom United Kingdom
Flag of Russia Russia (1914-17)
Flag of Serbia (1882-1918) Serbia
Flag of Portugal Portugal
Flag of Romania Romania
Hellenic Kingdom Flag 1935 Greece
Central Powers
Flag of Austria-Hungary (1869-1918) Austria-Hungary
Flag of the German Empire Germany
Flag of the Ottoman Empire Ottoman Empire
Flag of Bulgaria Bulgaria
Flag of Italy (1861-1946) Italy
Flag of Belgium (civil) Belgium
Flag of the Netherlands Netherlands
Flag of Denmark Denmark
Commanders and leaders
Flag of France Georges Clemenceau
Flag of France Raymond Poincaré
Flag of the United Kingdom H. H. Asquith
Flag of the United Kingdom David Lloyd George
Flag of Russia Nicholas I
Flag of Serbia (1882-1918) Peter I
Flag of Romania Ferdinand I
Flag of Austria-Hungary (1869-1918) Franz Joseph
Flag of Austria-Hungary (1869-1918) Karl I
Flag of the German Empire Wilhelm II
Flag of the Ottoman Empire Mehmed V
Flag of Bulgaria Ferdinand I
Flag of Italy (1861-1946) Vittorio Orlando
Flag of Italy (1861-1946) Victor Emmanuel III
Flag of Belgium (civil) Albert I
Flag of the Netherlands Pieter Cort van der Linden
Flag of Russia 12,000,000
Flag of the United Kingdom 8,841,541
Flag of France 8,660,000
Flag of Romania 1,234,000
Flag of Serbia (1882-1918) 707,343
Hellenic Kingdom Flag 1935 250,000
Total: 31,692,884
Flag of the German Empire 13,250,000
Flag of Austria-Hungary (1869-1918) 7,800,000
Flag of Italy (1861-1946) 5,615,140
Flag of the Ottoman Empire 2,998,321
Flag of Bulgaria 1,200,000
Flag of Belgium (civil) 380,000
Total: 31,243,461

The Great European War, also know in Europe as Great War, was a conflict occurred in the first half of the 20th-century, from 28 july 1914 to 11 November 1918. The war was developed principally in the European continent, in which more than 70 million military personnel, were mobilised in one of the largest wars in history. Over nine million combatants and 7 million civilians died as a result of the war, a casualty rate exacerbated by the belligerents technological and industrial sophistication, and the tactical stalemate caused by grueling 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, since the Napoleonic Wars, the Great European War was the most important conflict in the continent and had a very important repercussion for future European affairs.

The war drew in all the world's economic great powers, assembled in two opposing alliances: the Allies (based on the Triple Entente of the British Empire, France and the Russian Empire) versus the Central Powers of Germany, Italy and Austria-Hungary.  These alliances were reorganised and expanded as more nations entered the war: Portugal, Japan, Greece and Romania joined the Allies, while the Ottoman Empire, Belgium, Denmark, Bulgaria and the Netherlands joined the Central Powers.