By October 1643 Charles had negotiated a peace to end the Irish Rebellion of 1641, and was seeking to transfer his army in Ireland back to England to support his campaigns there. There was also the potential for Irish regiments to also cross to his aid. The Pembrokeshire seaports became of vital strategic importance, and Carbery was instructed to secure them for the king. This he did by rallying the Pembrokeshire gentry for the king and threatening attacks on the towns. Faced with this challenge, Tenby submitted on 30 August, and by 24 October Pembroke had done likewise. Charles rewarded Carbery for his success by creating him Baron Vaughan of Emlyn on 24 October, raising him to the English peerage and entitling him to sit in the English House of Lords. An appointment as governor of Milford Haven followed on 17 November, giving him control over Pembroke and its approaches.