Following it, the Russian, French, German, and Austro-Hungarian armies mobilized.
The conspirators in this event were coordinated by Danilo Ilic. This event was preceded by the throwing of a hand grenade by Cabrinovic that blew up the wrong car. This action, which was meant to cause the secession of a certain nation's south-Slav provinces, killed Duchess Sophie. Following it, the Russian, French, German, and Austro-Hungarian armies mobilized. Organized by the Black Hand terrorist cell, for 10 points, identify this killing in Sarajevo by Gavrilo Princip that led to World War I.
The conspirators in this event were coordinated by Danilo Ilic.
the {assassination} of Archduke Franz {Ferdinand} [or equivalents, like {murder} or killing]