During the War of 1812, Brisbois furnished supplies to both the American and British forces but maintained a pro-British attitude. Arrested for treason at the close of the war, he was sent to St. Louis, Missouri, for trial but was acquitted. After the war, Brisbois became a baker in Prairie du Chien. Still a trader at heart, he noted the lack of stability in early government currency, and encouraged the use of bread (from his bakery) as a unit of exchange.