Corbineau entered the Imperial Guard on 12 September 1805, where he served in the "Chasseurs à Cheval de la Garde Impériale" successively as an "adjoint à l'état-major" (assistant to the Staff), then "adjudant-major", and finally as a "chef d'escadron". He fought at the battles of Austerlitz (2 December 1805), afterwards receiving promotion to major (18 December 1805), and also at Jena (14 October 1806), Eylau (7/8 February 1807)—where he was wounded in the right thigh, and his older brother Claude was killed—and Friedland (14 June 1807).