Fieschi was waiting for them, 24 barrels of his gun were each loaded with eight round balls and additional slugs. When the royal party passed in the street below, he fired the gun. Not all the barrels fired, but the gun still produced a volley of around 400 projectiles. Eighteen people were killed at the scene, or later died from their wounds, including Lieutenant Colonel Rieussec together with eight other officers of the 8th Legion, Marshal Mortier, and Colonel Raffet, General Girard, Captain Villate, General La Chasse de Vérigny and Alexandre Labrouste, father of notable architect Henri Labrouste.