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Archduke Franz Ferdinand of Austria and his wife, Sophie, was shot and killed. They were killed by a Bosnian Serb nationalist during a official visit to the Bosnian capital of Sarajevo. This led to a chain of events that led to the outbreak of world war one. The war latest for five years, ending in the signing of the Treaty of Versailles.
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One month to the day of the assassination of Archduke Franz Ferdinand. Austria- Hungary declared war on Serbia beginning the first world war. They thought the best way to respond to the assassination way to prepare for a possible military invasion. ONly after securing the support of their ally, Germany.
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Russia's first and second armies advanced into East Prussia. They wanted to divert German resources and relieve pressure on France during the start of the first world war.
