Battle of Cer On 28 June 1914, Bosnian Serb student Gavrilo Princip assassinated Archduke Franz Ferdinand of Austria in Sarajevo. The assassination precipitated the July Crisis, which led Austria-Hungary to issue an ultimatum to Serbia on 23 July on suspicion that the assassination had been planned in Belgrade. The Austro-Hungarian government made the ultimatum intentionally unacceptable to Serbia, and it was indeed rejected. The Austro-Hungarians declared war on Serbia on 28 July and that same day the Serbs destroyed all bridges on the Sava and Danube rivers in order to prevent the Austro-Hungarians from using them during any future invasion. Belgrade was shelled
Ferdinand II, Archduke of Austria Ferdinand II, Archduke of Austria Ferdinand II, Archduke of Further Austria (Linz, 14 June 1529 – 24 January 1595, Innsbruck) was ruler of Further Austria including Tirol. The son of Ferdinand I, Holy Roman Emperor, he was married to Philippine Welser in his first marriage. In his second marriage to Anna Juliana Gonzaga, he was the father of Anna of Tyrol, the would-be Holy Roman Empress. Archduke Ferdinand of Austria was the second son of Ferdinand I, Holy Roman Emperor and Anna of Bohemia and Hungary. He was a younger brother of Emperor Maximilian II. At the behest of his