Robert Barclay entered service in the fall of 1780 under Captain Marshall Jones and marched to Camden after scouting about for some time and there joined the General Thomas Sumter's Army and marched through SC and NC frequently on duty to suppress the Tories in that part of the country. During his service he was a part of the time under said Captain Jones, their Lieutenant John Gates, Captain Daniel Stewart, and Major Thomas Thompson commanded the Battalion. He was discharged in August 1782 by General William Henderson, who
commanded the Army at the time he was discharged. He was in no considerable battle though he was in several scrimmages and was on scouting service at the time of the Battle of the Eutaw Springs [September 8, 1781] or he would have been in that engagement.