He then joined Turenne during his Rhineland campaign of 1644–1646, fighting at the battles of Freiburg and Nördlingen. The end of the Thirty Years War in 1648 led to a struggle for political control between powerful nobles including Condé, Turenne and his brother the Duc de Bouillon, and a Court party headed by Anne of Austria, mother of the 8 year old Louis XIV, and Cardinal Mazarin. This triggered a civil war known as the Fronde, although the defection of Turenne in 1651 and the Battle of the Faubourg St Antoine in July 1652 ended it as a serious threat to the French state.