 However, in the latter year it was given back to Charles V. Again surrendered to the French in 1557, it finally was assigned to Spain in 1559 by the Treaty of Cateau-Cambrésis.In 1635, during the Thirty Years' War, Valenza resisted for 60 days a siege from French, Parmense and Savoyard troops.During the later part of the Franco-Spanish War (1635–59), it again withstood a French siege in 1641, but in 1656, after 70 days of siege, it capitulated to French, Savoyard and Modenese troops.