 On the day of his ordination, and at the risk of his life, accompanied by the Abbés Richard, Martignon and Cicquard, he sailed for America and arrived at Baltimore on June 24, 1792, where he offered his first Mass.Maréchal was sent to the mission in St. Mary's County, and later to Bohemia on the eastern shore of Maryland.In 1799 he was teaching theology at the Sulpician's St. Mary's Seminary, in Baltimore, and in 1801 he was teaching philosophy at Georgetown College.