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Italy switches sides
Committed to germany and austria-hungary in a defensive war. they did not view germany's acts as defensive so the switched sides. -
Assassination of Archduke Franz Ferdinand
Archduke Franz Ferdinand and his wife Sophie were assassinated by the Black Hand, specifically Gavrilo Princip, in Sarajevo, Bosnia-Herzegovina -
Mobilization of Russian troops
Tsar Nicholas II ordered the mobilization of Russian forces to deter Austria-Hungary from invading Serbia. -
Germany mobilized their troops
Germany mobilized their troops in response to the mobilization of the russian troops -
France Joins
bound by a treaty to russia -
Britain joins
Linked to France by a relatively loose treaty -
Belgium Joins
Had a military agreement with britain that it honored. -
Battle of Verdun
The Battle of Verdun was fought from 21 February to 18 December 1916 on the Western Front in France. The battle was the longest of the First World War and took place on the hills north of Verdun-sur-Meuse. -
Colonies of Britain Join
India, austrian canada, NZ, SA offered military support for britain -
United States Join
The sinking of the lusitania and the zimmerman note forced their hand to enter the war