World War I and beyond. On 28 June 1914, Archduke Franz Ferdinand, heir presumptive to the Austro-Hungarian Empire, visited the Bosnian capital, Sarajevo. A group of six assassins (Cvjetko Popović, Gavrilo Princip, Muhamed Mehmedbašić, Nedeljko Čabrinović, Trifko Grabež, and Vaso Čubrilović) from the Yugoslavist group Mlada Bosna, supplied with arms by the Serbian Black Hand, gathered on the street where the Archduke's motorcade was to pass, with the intention of assassinating him. The political objective of the assassination was to break off Austria-Hungary's South Slav provinces, which Austria-Hungary had annexated from the Ottoman Empire, so they could be combined into a Yugoslavia. Čabrinović
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