In 1652 a reward of £300 was by the English Commonwealth government set upon his head, yet at the conclusion of the war he was permitted to enter the Spanish service with 1,200 of his men. At the Battle of the Dunes (1658) he commanded the "Lord Ormond's regiment of Irish" in the services of King Charles II. After some time he went over to the French side, without betraying any trust imposed upon him, having given due notice to his Spanish friends. After the Restoration he was appointed Chamberlain to the Duke of York (the future James II), and in consideration of his faithful and indefatigable services, received "pensions of £400, and a portion at least of his estates were restored to him." When James II. came to Ireland, Grace was appointed Governor of Athlone, with a garrison of three regiments of foot, and eleven troops of cavalry.