Recalled to the "Grande Armée" for the invasion of Russia, Beaumont commanded a brigade within Watier's 2nd Cuirassier Division of Montbrun's II Cavalry Corps. He fought at Smolensk, at Borodino and at two smaller actions around Moscow in October 1812. He was given command of a brigade of dismounted cavalry on 18 October, and made "Général de division" on 4 December 1812.