1. Events by year
1.1. 1914
1.1.1. Western front
1.1.1.1. German invasion of Belgium and Luxembourg
1.1.1.2. Battle of the Marne
1.1.1.3. Battles in Flanders or "run to the sea"
1.1.1.4. Battle of Flanders or the first battle of Ypres
1.1.2. Eastern front
1.1.2.1. East Prussian operation
1.1.2.2. Battle of Tannenberg
1.1.2.3. Battle of Galicia
1.1.2.4. Ottoman Empire entered the war
1.1.3. Other
1.1.3.1. Japan entered the war
1.1.3.2. The war begins
1.2. 1915
1.2.1. Western front
1.2.1.1. Second Battle of Ypres
1.2.1.2. German forces used poison gases for the first time
1.2.1.3. Offensive operations of England and France in Champagne and Artois
1.2.1.4. Four battles of Isocino
1.2.1.5. Italy changes sides in the war
1.2.2. Eastern front
1.2.2.1. Winter battle in Masuria
1.2.2.2. Carpathian operation
1.2.2.3. Gorlitsky breakthrough
1.2.2.4. Battle of the Gulf of Riga
1.2.2.5. Complete capture of Serbia
1.2.2.6. Bulgaria entered the war
1.3. 1916
1.3.1. Western front
1.3.1.1. Battle of Verdun
1.3.1.2. Battle of the Somme
1.3.1.3. Battle of Jutland
1.3.2. Eastern front
1.3.2.1. Lake Naroch Offensive
1.3.2.2. Brusilov Offensive
1.3.2.3. Baranovichi offensive
1.3.2.4. Romania enters the war
1.4. 1917
1.4.1. Western front
1.4.1.1. Unrestricted submarine warfare
1.4.1.2. United States entry into the war
1.4.1.3. Battle of Passchendaele
1.4.1.4. Battle of Caporetto
1.4.2. Eastern front
1.4.2.1. February Revolution
1.4.2.2. Kerensky offensive or July offensive
1.4.2.3. Battle of Jugla
1.4.2.4. October Revolution
1.5. 1918
1.5.1. Western front
1.5.1.1. Spring Offensive
1.5.1.2. Second Battle of the Marne
1.5.1.3. Hundred Days Offensive
1.5.1.4. Battle of Amiens
1.5.1.5. Battle of Saint-Mihiel
1.5.1.6. German Revolution
1.5.1.7. Armistice of 11 November
1.5.2. Eastern front
1.5.2.1. Treaty of Brest-Litovsk, Russia is defeated.
1.5.3. Other
1.5.3.1. Defeat of the Central Forces, end of the war
2. Other names
2.1. Great War
2.2. The war to end war
3. Parties to the conflict
3.1. Allies
3.1.1. France
3.1.2. British Empire
3.1.3. Russia
3.1.4. Serbia
3.1.5. Belgium
3.1.6. Japan
3.1.7. Montenegro
3.1.8. United States
3.1.9. Romania
3.1.10. Portugal
3.1.11. Greece
3.1.12. Italy
3.2. Central Powers
3.2.1. Germany
3.2.2. Austria-Hungary
3.2.3. Ottoman Empire
3.2.4. Bulgaria
4. Causes of the war
4.1. Assassination of Archduke Franz Ferdinand
4.2. Improving military technology
4.3. Tense geopolitical situation
4.4. Bosnian Crisis
4.5. Moroccan Crisis
5. Consequences and results of the war
5.1. Treaty of Versailles
5.2. The collapse of four empires
5.2.1. Russian empire
5.2.2. German empire
5.2.3. Austria-Hungary
5.2.4. Ottoman empire