During O'Doherty's Rebellion of 1608 he returned to active service with the Irish Army, following the Burning of Derry. In 1624, he was elected Mayor of Derry. He was a strong supporter of George Villiers, 1st Duke of Buckingham and led a force of Irish troops to serve under him at the Siege of La Rochelle. He was killed during the battle of the Pont du Feneau.