In 1792, he travelled to England and then Lower Canada. Chaussegros de Léry was named captain in the Royal Canadian Volunteer Regiment in 1798 and served until the regiment was dissolved in 1802. In 1799, he married Madeleine-Charlotte, the daughter of seigneur René-Amable Boucher de Boucherville. He was named chief road commissioner for Montreal district in 1806. He was also named a justice of the peace. He served in the local militia during the War of 1812, becoming lieutenant-colonel in 1813. In 1818, Chaussegros de Léry was named to the Legislative Council of Lower Canada.
