On 9 March 1762 he was promoted from Lieutenant-Colonel to Colonel of Foot, and later to Major-General. He served in North America, including at the Battle of Bunker Hill. He was appointed to the Privy Council of Ireland on 28 May 1777 and promoted to Lieutenant-General on 6 September 1777.
In 1783 he was re-elected for Trim alongside William Wellesley, and in May 1790 alongside Arthur Wellesley.
On his death later that year, he was succeeded as Member of Parliament for Trim by Clotworthy Taylor, and as Colonel of the 64th Regiment of Foot by Major-General John Leland.