 On 26 June 1810, he married Agathe de Lorimier, a Métis daughter of Claude-Nicolas-Guillaume de Lorimier, resident Indian agent at Caughnawaga (Kahnawake).On 21 July 1812, after the US invaded Canada, Ducharme was commissioned a lieutenant in the Pointe-Claire Battalion of Militia.In May 1813 Ducharme was ordered to the Niagara frontier, Upper Canada, in command of a party of Six Nations Indians from Lac-des-Deux-Montagnes and Saint-Régis.