He married in 1728 and began investing heavily in the commerce of the fur trade while continuing his military career.
During King George's War, he had serious combat experience in Acadia for which he was awarded the cross of Saint Louis in May 1749 for his actions at the Battle of Grand Pre.
During Father Le Loutre's War he was involved in other hostile military operations as well as organizing militias amongst new settlers in new territories (see Battle at Chignecto).
By July 1755, La Corne was back east and was heavily involved in military matters for the next five years, patrolling the Montreal to Lake Ontario waterway with a large contingent of men.
He was to be deported to France in 1761 and was one of the victims when the ship, Auguste sank off the coast of Cape Breton Island on November 15 of that year.