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
Trifko Grabež also hit by bomb shrapnel. Later that day, Gavrilo Princip managed to kill both Archduke Franz Ferdinand and his wife Sophie, Duchess of Hohenberg. Princip and Nedeljko Čabrinović were interrogated by the police. They kept to the promise to not tell anyone. Muhamed Mehmedbašić managed to escape to Serbia but Grabež, Popović and the Čubrilović's were arrested and charged with treason and murder after Danilo Ilić told the police. The police went round and investigated random people in order to identify potential accomplices. Once they spoke to Ilić, he lost his nerve and spilled the beans. All seven of the