For reference:
https://en.wikipedia.org/wiki/Assas...z_Ferdinand_of_Austria#Planning_direct_action
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Planning direct action
Danilo Ilić was a Bosnian Orthodox Serb. He had worked as a school teacher and as a bank worker but in 1913 and 1914 he lived with, and outwardly off, his mother, who operated a small boarding house in Sarajevo. Secretly, Ilić was leader of the Serbian-irredentist Black Hand cell in Sarajevo. In late 1913, Danilo Ilić came to the Serbian listening post at Užice to speak to the officer in charge, Serbian Colonel C. A. Popović, who was a captain at the time and a member of the Black Hand. Ilić recommended an end to the period of revolutionary organization building and a move to direct action against Austria-Hungary. Popović passed Danilo Ilić on to Belgrade to discuss this matter with Chief of Serbian Military Intelligence Colonel Dragutin Dimitrijević, known more commonly as Apis.[23] By 1913, Apis and his fellow military conspirators (drawn heavily from the ranks of the May 1903 coup) had come to dominate what was left of the Black Hand.[24]
There are no reports as to what took place between Ilić and Apis, but soon after their meeting, Apis's righthand man and fellow Black Hander, Serbian Major Vojislav Tankosić, who by this time was in charge of guerrilla training, called a Serbian irredentist planning meeting in Toulouse, France.[25] Amongst those summoned to the Toulouse meeting was Muhamed Mehmedbašić, a carpenter by trade and son of an impoverished Muslim noble from Herzegovina.[26] He too was a member of the Black Hand, having been sworn into the organization by Black Hand Provincial Director for Bosnia-Herzegovina Vladimir Gacinović and Danilo Ilić. Mehmedbašić was (here quoting Albertini paraphrasing Mehmedbašić) "eager to carry out an act of terrorism to revive the revolutionary spirit of Bosnia."[27] During this January 1914 meeting, various possible Austro-Hungarian targets for assassination were discussed, including Franz Ferdinand. However, the participants decided only to dispatch Mehmed Mehmedbašić to Sarajevo, to kill the Governor of Bosnia, Oskar Potiorek.[27]
While Mehmedbašić was travelling to Bosnia-Herzegovina from France, police searched his train for a thief. Thinking the police might be after him, he threw his weapons (a dagger and a bottle of poison) out the train window.[27] Once he arrived in Bosnia-Herzegovina he had to set about looking for replacement weapons.
Franz Ferdinand chosen
The search for new weapons delayed Mehmedbašić's attempt on Potiorek. Before Mehmedbašić was ready to act, Ilić summoned him to Mostar. On 26 March 1914,[28] Ilić informed Mehmedbašić that Belgrade had scrapped the mission to kill the governor. The plan now was to murder Franz Ferdinand, and Mehmedbašić should stand by for the new operation.[29] (Apis confessed to the Serbian Court that he ordered the assassination of Franz Ferdinand in his position as head of the Intelligence Department.)[30] The assassination was planned with the knowledge and approval of the Russian ambassador in Belgrade Nikolai Hartwig and the Russian military attache in Belgrade Viktor Artamonov.[31]"