Later that year, he renounced his claim to his father's estate, due to the large debts associated with it.
However, in 1807, he inherited the seigneuries of Soulanges and Nouvelle-Longueuil from his maternal uncle, Joseph-Dominique-Emmanuel Le Moyne de Longueuil.
He served as a captain in the local militia during the War of 1812.
He was elected to the Legislative Assembly of Lower Canada for Montreal East in 1814.