Greater Serbia the Kingdom of Serbia retreated from Durrës in April 1913 under pressure of the naval fleet of Great Powers, but it remained in other parts of Albania for the next two months. The secret military society called Unity or Death, popularly known as the Black Hand, headed by Serbian colonel Dragutin Dimitrijević Apis, which took an active and militant stance on the issue of a Greater Serbian state. This organization is believed to have been responsible for numerous atrocities following the Balkan Wars in 1913. In 1914, Young Bosnia member Gavrilo Princip assassinated Archduke Franz Ferdinand in Sarajevo, which set
Sarajevo as an Ottoman stronghold in the 15th century. Sarajevo has attracted international attention several times throughout its history. In 1885, Sarajevo was the first city in Europe and the second city in the world to have a full-time electric tram network running through the city, following San Francisco. In 1914, it was the site of the assassination of Archduke Franz Ferdinand of Austria by local Young Bosnia activist Gavrilo Princip that sparked World War I, which also ended Austro-Hungarian rule in Bosnia and resulted in the creation of the Kingdom of Yugoslavia. Later, after World War II, the establishment of