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
Archduke Franz Salvator of Austria Archduke Franz Salvator of Austria Archduke Franz Salvator of Austria, in Italian Francesco Salvatore Maria Giuseppe Ferdinando Carlo Leopoldo Antonio di Padova Giovanni Battista Gennaro Lodovico Gonzaga Raniero Benedetto Bernardo, in German Franz Salvator Maria Joseph Ferdinand Karl Leopold Anton von Padua Johann Baptist Januarius Aloys Gonzaga Rainer Benedikt Bernhard (Altmünster, 21 August 1866 – Vienna, 20 April 1939), was a member of the Tuscan branch of the House of Habsburg. He was a son of Archduke Karl Salvator, Prince of Tuscany and his wife Princess Maria Immaculata of Bourbon-Two-Sicilies. He was a cavalry general in the Imperial and Royal