 Armand-Nompar de Caumont was made Grand Maître de la garde-robe in 1632, resigning in 1637.He followed his father in most of his expeditions, became a maréchal de camp in 1625, defeated and captured General Colloredo Baccarat in 1636, had two horses killed under him at the siege of Hondarribia in 1638, became lieutenant général in 1641.First marquis de La Force, later duc de La Force, he fought in the wars of Louis XIII and Louis XIV in Italy and Germany.He succeeded his father as duc de La Force and a peer of France and was sworn in as a Marshal of France on 29 August 1652 at Compiègne.