Need proof that David Pierson, b. ca. 1742, d. Columbia Co., NY Sept. 24, 1818 served in the Revolutionary War. He married Nov. 20, 1764 to Elizabeth Gelston, b. Nov. 30, 1746, Suffolk Co., NY & she d. 1792 at Bridgehampton, Long Island, NY. Their son David, Jr., m. Charlotte Francis on Dec. 9, 1804 at Pittsfield, Mass. Any help appreciated. Frances Hall