Infernal Machine

"The surviving Royalists are going to attempt an attack on Napoleon. The centerpiece is a giant improvised explosive device, lovingly known as the "Machine Infernale"."

- Bishop The Infernal Machine was an improvised explosive device meant to be used by the Royalists, led by François-Joseph Carbon, to assassinate Napoleon Bonaparte on his way to the opera on 24 December, 1800. The Royalist snipers meant to shoot the device once Napoleon neared it were killed by Assassins.

Reference

 * Assassin's Creed: Unity