 In 1778 he was clerk for both the Court of Quarter Sessions and the Orphans Court.In 1781 he was Clerk of Court, Westmoreland County, Pa. Also in 1781, Archibald was made a Colonel and given command over 100 men to discomfort Indian and British forces in the Ohio Valley during the Revolutionary War.Following the French and Indian War and during the colonization of Western Pennsylvania, Virginia and Kentucky, friction between Europeans and Native Americans was an almost constant feature.