Promoted to "Général de brigade" on 24 December 1805, Carrière was made first aide-de-camp to Marshal Murat, and tasked with taking possession of Wesel on 9 March 1806. He served in Prussia and Poland in 1806/7, fighting at Jena on 14 October 1806. On 16 October, he took provisional command of a light cavalry brigade in place of General Milhaud, serving at Prenzlau on 28 October before returning to his role on Murat's staff. He fought at Eylau, and in front of Danzig on May 14 1807, where he commanded the light cavalry of I Corps in place of General La Houssaye. Ordered to stop a force of 10,000 men marching from Pillau, he attacked and destroyed this body, taking their artillery and a large number of prisoners. On the same day he was made a Commander of the "Légion d'Honneur" and a Knight of the Order of the Iron Crown. He commanded the I Corps reserve cavalry at Friedland and contributed to the success of the day.