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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.
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Germany invades Luxembourg and Belgium.
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Great Britain entered World War I on 4 August 1914 when the king declared war after the expiration of an ultimatum to Germany.
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French troops attack German Army at the River Aisne
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took place in 1917 when the peasants and working class people of Russia revolted against the government of Tsar Nicholas II.
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President Wilson demands, and the U.S. Senate approves a Declaration of War against Germany.