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Germans use poison gas
German use poison gas at the second battle of Ypres -
Emperor Franz Joseph of Austria-Hungary declares war on Serbia
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Franz Ferdinand assassinated
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The Ottoman Empire signs a secret alliance with Germany
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Austria-Hungary declares war on Russia.
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Germany declares war on neutral Belgium and invades Belgium and Luxembourg
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The German army defeats Russia at the Battle of Tannenberg.
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- German invasion of France is halted at the First Battle of Marne.
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The Race to the Sea ends when the Germans withdraw at the 1st Battle of Ypres
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The United States declares neutrality in the war.
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