WWI

Assassination of Archduke Ferdinand

Jun 28, 1914

Archduke and his wife were killed by Bosnian Serb nationalist, which sparked WWI

Serbia appeals to Russian for help

Jul 24, 1914

Serbia was attacked by a Austria Hungarian army, and appealed Russia to help them get revenge.

Austria-Hungary declares war on Serbia

Jul 28, 1914

Russia mobilizes its armed forces in support of Serbia

Jul 31, 1914

This includes the sending of troops to its borders with Germany and Austro-Hungary.