In 1756, he commanded the expeditionary force sent to St Lucia, and the Carenage quarter of the island was renamed Castries after him. He next distinguished himself in the Battle of Rossbach (5 November 1757), in which he was wounded twice. Becoming lieutenant général (on 28 December 1758), he became maître de camp général of the cavalry on 16 April 1759. At the Battle of Clostercamp (16 October 1760), through his sang-froid he saved a situation when all seemed lost.