After Austria-Hungary declared war on Serbia, Russia mobilized and declared war on Austria-Hungary, and then Germany declared war on Russia, and they also declared war on France.
Germany knew that Russia's army would have a long time to mobilize, so they developed the Schlieffen Plan.
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World War One
Non-FictionThe events of World War One from the assasination of Archduke Franz Ferdinand to the abdication of the Kaiser, and the capitulation of Germany from 1914 to 1918. Enjoy reading.
