Rochegude was promoted to Lieutenant on 14 February 1778. That year, he served as first officer in the frigate "Résolue", part of the squadron under Orvilliers. He took part in the Battle of Ushant on 27 July 1778 He later transferred to the frigate "Junon", taking part in the capture of HMS "Ardent" in the 17 August 1779.