David Valentine entered the Navy in 1779 as an Able seaman and served on several ships then was promoted to Lieutenant in July 1793. His first ship as a Lieutenant was the Seagull, then he was transferred to the Thames under Capt. Cotes. In October of that year, they were involved in a battle with the French frigate Uranie, he was wounded and taken prisoner and spent two years in a French prison. He was freed in 1795 and promoted to Lieutenant Commander in 1804. He married Agnes Ann Valentine youngest daughter of David Valentine and Mary Smith in 1809 at St. Pancras Old Church, London.
Two of their sons emigrated to Canada, John VALENTINE, pictured below, was one of the first settlers in Paisley, Bruce County, Ontario.