After he was released, he returned to Russia, where he joined the 6th Jager regiment, and became lieutenant on 8 August 1802. Two years later, on 29 October 1804 he became staff captain, and on 31 January 1805, he was promoted to captain. In 1805, he served under Prince Pyotr Bagration and participated at Lambach, Amstetten, Krems, Schöngrabern, Wischau as well as the climactic Battle of Austerlitz, in which he was wounded on his right side, and later received the Order of St. George (4th Class) on 24 April 1806. Between 1806-1811, he served with his previous 6th Jager Regiment in the Danubian Principalities. He participated in the battles at Bucharest, Chediroghlu (received the Gold Sword for Bravery), Obilesti (promoted to the rank of major on 23 February 1808) as well as Kladovo, where he was wounded in the right leg and left hand. After having healed from his wounds, he subsequently served at Bartokert, for which he was promoted to lieutenant-colonel on 11 October 1809, Rassevat, Dudu (wounded in the left leg), Vidrovitz (promoted to full colonel on 24 July 1810), Praiova (received the Order of St.Vladimir (4th class) and of St. Anna (2nd class) and lastly at the battle of Bregov.