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Assassination of Archduke Ferdinand
Archduke and his wife were killed by Bosnian Serb nationalist, which sparked WWI -
Serbia appeals to Russian for help
Serbia was attacked by a Austria Hungarian army, and appealed Russia to help them get revenge. -
Austria-Hungary declares war on Serbia
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Russia mobilizes its armed forces in support of Serbia
This includes the sending of troops to its borders with Germany and Austro-Hungary.
