In 1663, he was appointed head of the Maison du Roi or the King's household; given its proximity to Louis XIV, this was a position of great importance, held by an individual of proven loyalty. In the 1667–1668 War of Devolution, France quickly over-ran Franche-Comté and much of the Spanish Netherlands; after the capture of Lille in 1667, Turenne detached a cavalry force under Bellefonds and de Créquy to cut off the Spanish retreat. They inflicted nearly 2,000 casualties, with Louis looking on; in 1668, Bellefonds, de Créquy and Humières were all created Marshals of France.