He was promoted lieutenant and captain on 21st September 1757 and in 1759 held the brevet rank of lieutenant-colonel. (A brevet rank is a nominal one only and carries only the pay of the officer's real rank. The custom of giving brevet ranks was particularly prevalent in the United States Army of the last century; the famous George Custer being a brevet general, his real rank being that of colonel). His next promotion was a paid one to captain and lieutenant-colonel on 12 June 1765, having served in the Newfoundland Campaign of 1762. The French had seized St. John's, Newfoundland in 1762 and used it as a base from which to attack British vessels in the Gulf of St. Lawrence. When news of this reached Sir Jeffrey Amherst at New York, he sent his brother William with a detachment of troops from Halifax, Nova Scotia, to recapture the Island. The navy provided a fleet under Lord Colvill.