During the War of the Third Coalition, he participated in the Ulm Campaign, in which cavalry played an essential part. He participated in French victories at Hohenlinden and later at Austerlitz, where he commanded the 2nd Dragoon Division in Marshal Joachim Murat's Cavalry Reserve. His division was a key to Soult's successful attack on the Russian center. He suffered wounds at both these battles and after the latter, he received "le Grand Aigle de la Légion d'honneur" (Grand Eagle of the Legion of Honor), and appointed Chamberlain to the Emperor. Subsequently, he was decorated as a Commander of the Order of the Iron Crown, and appointed as Colonel of the Grenadiers à Cheval (mounted grenadiers), of the Imperial Guard, in 1806, a position he held until his death 1813.