 Henry served as a major in the militia during the War of 1812, taking part in the Battle of Châteauguay, and was promoted to lieutenant-colonel in 1822.Henry acted as seigneurial agent for Napier Christie Burton, the son of Gabriel Christie; he was also crown land agent for the seigneury of Prairie-de-la-Madeleine and served as commissioner for roads and bridges.In 1815, he established the villages of Christieville (later Iberville), Napierville, and Henryville.