Serbian Campaign of World War I Serbia, Montenegro, and Greece. When Bulgaria attacked both Serbia and Greece on 16 June 1913, it lost most of its Macedonian region to those countries, and additionally the Southern Dobruja region to Romania and Adrianople (the present-day city of Edirne) to Turkey in the 33-day Second Balkan War, which further destabilized the region. On 28 June 1914, Gavrilo Princip, a Bosnian Serb student and member of a multi-ethnic organisation of national revolutionaries called Young Bosnia, assassinated Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne, in Sarajevo, Bosnia. The political objective of the assassination was the independence of
SMS Erzherzog Franz Ferdinand of these dreadnoughts, the navy shifted "Erzherzog Franz Ferdinand" and her sisters to the 2nd Division of the 1st Battle Squadron. The ship was named after Archduke Franz Ferdinand, whose assassination on 28 June 1914 triggered World War I. At that time, the battleships in the Austro-Hungarian Navy consisted of the "Radetzky" class, the "Tegetthoff" class, and the older and es. Along with the remainder of the Austro-Hungarian Navy, "Erzherzog Franz Ferdinand" was mobilized in late July 1914 to support the flight of and . The two German ships broke out of Messina, which was surrounded by the British navy,