Having been promoted to Brigadier General on 21 July 1809, Lhéritier left his regiment the next day and was given command of the 2nd Brigade of the 3rd Heavy Cavalry Division.
The next year, on 15 March 1813, Lhéritier was promoted to the rank of general of division and on 1 July was given the command of the 4th Heavy Cavalry Division of III Cavalry Corps.