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
Assassination of Archduke Franz Ferdinand that Austria-Hungary had been an "occupier". Princip's weapon, along with the car in which the Archduke was riding, his bloodstained uniform and the chaise longue on which he died, are on permanent display in the Heeresgeschichtliches Museum in Vienna, Austria. The bullet fired by Gavrilo Princip, sometimes referred to as "the bullet that started World War I", is a museum exhibit in the Konopiště Castle near the town of Benešov in the Czech Republic. The bronze medallion of Ferdinand and Sophie, which was part of a monument that was erected on the site of the assassination and demolished in 1918