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
History of modern Serbia of the Austro-Hungarian Empire, Archduke Franz Ferdinand of Austria, at his announced visit in Sarajevo. After Nedeljko Čabrinović's first unsuccessful attack, the Bosnian Serb nationalist Gavrilo Princip assassinated the Archduke and his wife Sophie Chotek. Princip, Čabrinović and their accomplice Trifko Grabež had come from Belgrade; the three told almost all they knew to Austro-Hungarian authorities. Serbian Major Vojislav Tankosić directly and indirectly not only had provided six hand grenades, four Browning Automatic Pistols and ammunition, but also money, suicide pills, training, a special map with the location of gendarmes marked, knowledge of contacts on a special channel used to