Events leading upto World War 1 By Izaak Jun 28, 1914 Franz Ferdinand, archduke of Austria-Hungry, assasinated in Sarajevo Jul 28, 1914 Unhappy at their response, Austria-Hungry declares war on Serbia Jul 29, 1914 Due to the alliance, Russia mobilises to support Serbia Aug 1, 1914 Due to the alliances, Germany declares war on Russia Aug 3, 1914 Germany invades France through Belgium Aug 4, 1914 Germany invades Belgium using the Schlieffen Plan. Britain declares war on Germany. Aug 4, 1914 Britain declares war on Germany Aug 5, 1914 Austria-Hungry declares war on Russia