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
Assassination of Archduke Franz Ferdinand The five bullets Žerajić fired at Varešanin and the fatal bullet he put in his own brain made Žerajić an inspiration to future assassins, including Princip and Princip's accomplice Čabrinović. Princip said that Žerajić "was my first model. When I was seventeen I passed whole nights at his grave, reflecting on our wretched condition and thinking of him. It is there that I made up my mind sooner or later to perpetrate an outrage." In 1913, Emperor Franz Joseph commanded Archduke Franz Ferdinand to observe the military maneuvers in Bosnia scheduled for June 1914. Following the maneuvers, Ferdinand and his