The younger brother of Henri de Rohan, he inherited the lordship of Soubise through his mother Catherine de Parthenay. He served his apprenticeship as a soldier under Maurice of Nassau in the Low Countries. In the religious wars from 1621 onwards his elder brother chiefly commanded on land and in the south, Soubise in the west and along the sea-coast. His exploits in the conflict have been sympathetically related by his brother, one of the most highly regarded military critics of the time.