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Serbian Campaign
The Serbian Campaign began after the Austro-Hungarian declaration of war on Serbia in July 1914, after which three unsuccessful Austro-Hungarian invasion attempts were repelled by the Serbs and their Montenegrin allies. -
Germany attacks
Germany invades Luxembourg and Belgium. -
Great Britain enters
Great Britain entered World War I on 4 August 1914 when the king declared war after the expiration of an ultimatum to Germany. -
French attacks
French troops attack German Army at the River Aisne -
Russian Revolution
took place in 1917 when the peasants and working class people of Russia revolted against the government of Tsar Nicholas II. -
U.S.A involvement
President Wilson demands, and the U.S. Senate approves a Declaration of War against Germany.