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
Otto Merz in an official motorcade in which the Archduke Franz Ferdinand toured Sarajevo, and may have witnessed the assassination of the Archduke by Gavrilo Princip. According to the story told later, Merz reacted quickly to the gunshots. One of the first to reach Franz Ferdinand, he lifted the rather stout Archduke from his seat and carried him to a nearby house. However, that day there were "two" attempts on Franz Ferdinand's life; in the first one, Nedeljko Čabrinović threw a bomb with a 10-second fuse at the archduke's car; the driver accelerated when he saw something thrown at them, and the