Montrichard was next designated for the Army of England and then the Army of Italy, and in October of 1798 he replaced Louis-Gabriel Suchet as chief of staff of the Army of Italy under Barthélemy Catherine Joubert's command. He occupied Alexandria in December and then in February of 1799 he was promoted to général de division. Taking command of the right wing of the Army of Italy, Montrichard served at Pastrengo in March and then Magnano in April. He next served as commander at Bologna before rejoining Étienne Macdonald's army. In June Montrichard lifted the blockade of Bologna and the fort of Urbin and then he served at the Battle of Trebbia.