Trifko Grabež society. For the next two years he spent most of his spare time with other nationalists who favoured a union between Bosnia and Herzegovina and Serbia. When it was announced that Archduke Franz Ferdinand, the heir to the throne of Austro-Hungarian Empire, was going to visit Bosnia and Herzegovina in June 1914, Colonel Dragutin Dimitrijević, the chief of the Intelligence Department in the Serbian Army and head of the Black Hand, sent seven men, Grabež, Nedeljko Čabrinović, Vaso Čubrilović, Cvjetko Popović, Danilo Ilić, Muhamed Mehmedbašić and Gavrilo Princip to Sarajevo to assassinate him. Each man was given either a revolver
Assassination of Archduke Franz Ferdinand mobilized. Russia's mobilization set off full Austro-Hungarian and German mobilizations. Soon all the Great Powers except Italy had chosen sides and gone to war. Later, referring to Franz Ferdinand's assassination, Vaso Čubrilović said: "We destroyed a beautiful world that was lost forever due to the war that followed." Various countries of the former Yugoslavia, Bosniaks and Croats largely view Gavrilo Princip as a terrorist and an ethnic Serb nationalist. The 100th anniversary of the assassination was commemorated with a concert by the Vienna Philharmonic in the Sarajevo City Hall, in an event that was organized by the European Union. Austrian