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Archduke Franz Ferdinand, heir to the Austrian trhone, is assassinated.
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Austria blamed Serbia for the death of Franz Ferdinand and set it an ultimatum.
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Austria declared war on Serbia and shelled its capital, Belgrade.
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The Russian army got ready to help Serbia defend itself agaisnt the Austrian Attack, but Germany warned Russia not to help the Serbs.
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Germany declared war on Russia. It also began to move its army towards France and Belgium.
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The Franch army was put on a war footing ready to fight any German invasion.
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Germany declared war on France and invaded Belgium. Britain ordered Germany to withdraw from Belgium.
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With the Germans still in Blegium, Britian declared war on Germany,
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To complete the picture, Austria declared war on Russia.