What type of gun did Princip use to assassinate Franz Ferdinand ?
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 .