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Serbian Campaign
began after the Austro-Hungarian declared war on Serbia -
Germany Attacks
invades Luxembourg and Belgium in the first invasion -
Great Britain Enters WW1
entered when king declared after expiration of an ultimatum to Germany -
French Army Attacks
French Army attack Germany's Army -
Revolution of Russia
peasants and working class of Russia revolted against their own government -
America gets involved
USA's president declares war against Germany
