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Archduke Franz Ferdinand was assassinated.
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Germany sends a blank cheque to Austria-Hunagary.
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Austria blames Serbia for the killing of Archduke Ferdinand.
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Austria declares war on Serbia, Belgrade (in Serbia) was shelled.
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The Russian army gets ready to help Serbia defend itself against the Austrian attack.
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Germany sends a demand to Russia ordering it to hold back from helping Serbia.
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Germany declares war on Russia. It also begins to move its army towards France and Belgium.
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The French army is put on a war footing ready to fight any German invasion.
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Germany declares war on France and invades neutral Belgium. Britian orders Germany to withdraw from Belgium.
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The Germans are still in Belgium. Britian declares war on Germany.
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To complete the picture Austria declares was on Russia.