On arrival at
Québec, Watteville immediately struck up a friendship with the
Governor General of Canada, Lieutenant General Sir
George Prevost, himself of Swiss origin. 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 force at the
Battle of Chateauguay. De Watteville was present and gave full credit to de Salaberry in his dispatch. Prevost, however, who was also present, belittled both de Watteville and de Salaberry in his own dispatch, which took precedence over those of his subordinates. In June 1814, de Watteville was transferred briefly to the
Richelieu River sector, but on 8 August, he was appointed to command the "Right Division" on the
Niagara River in Upper Canada, succeeding Major General
Phineas Riall, who had been wounded and taken prisoner by the Americans at the
Battle of Lundy's Lane. He reported to the siege lines around
Fort Erie on 15 August. On 17 September, American troops made a
sortie against de Watteville's lines, leading to a bloody engagement in which about 600 men were killed or wounded on each side. As campaigning wound down over the winter, de Watteville took leave in Montreal to meet his wife and family. Here he learned that the War had ended. After presiding over the
court martial of Major General
Henry Procter, he resumed his command. ==Later life==