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Austria blamed Serbia for the death of Franz Ferdinand and sent it an ultimatum.
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Austria declared war on Serbia and shelled it's capital, Belgrade.
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The russian army got ready to help Serbia defend itself against the Austrian attack.
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Germany declaed war on Russia. It also began to move it's army towards France and Belgium.
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The French army was put on a war footing reading to fight any German invastion
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Germany declared war on France and invaided Belguim. Britain ordered Germany to withdraw from Belgium
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With the Germans still in Belgium, Britain declared war on Germany
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Austria declared war on Russia