 He received promotion to Major General on 11 August 1813, although for a time held no appointment.On 17 October, he was appointed to command the district of Montreal, which at the time was threatened by American armies approaching on two fronts.De Watteville immediately called out the militia and began strengthening his defences, but on 26 October, his collected outpost units under Lieutenant Colonel Charles de Salaberry defeated the nearest American army at the Battle of Chateauguay.