In 1811, he became a police magistrate and, in 1812, was named coroner for Montreal. Mondelet served as a major in the militia during the War of 1812, he later became lieutenant-colonel and then commander of a militia battalion.
In 1811, he became a police magistrate and, in 1812, was appointed coroner for Montreal. Mondelet served as a major in the militia during the War of 1812; later, he became lieutenant-colonel and then commander of a militia battalion.