He commanded the 2nd Battalion of the Royal Americans on Wolfe's expedition to Quebec. At the Battle of the Plains of Abraham on 13 Sept 1759, having marched up the shore of the St. Lawrence opposite Quebec, he crossed over with his battalion, who were the last to join the British lines before battle. The rear of the left flank, facing French irregulars on that side, was covered by two battalions commanded by Brigadier-General George Townshend. These were the 15th, commanded by Major Irwing and the 2nd commanded by Captain Oswald. (See map).