Chief of the Bonnot gang , Jules Bonnot , run to earth in a garage at Choisy-le Roi , 6 miles from Paris where he was besieged by Republican guards for five hours before they blew up the garage . 28th April 1912 . Lieutenant Fontan who laid the dynamite in front of the horse - the haycart which was used as a screen . The Bonnot Gang was a French criminal anarchist group that operated in France and Belgium during the Belle 夗oque , from 1911 to 1912 . Comprised of individuals who identified with the emerging illegalist milieu , the gang utilized cutting-edge technology ( including automobiles and repeating rifles ) not yet available to the French police .