Produced for the French Navy, the rare chart displayed here was the best available chart of this region for the time, and was used by all naval forces involved in combat during the American Revolutionary War. The information on this very detailed chart was based primarily on the work of American Anthony Smith, a local Chesapeake Bay pilot of St. Mary's County. The chart was consulted by Admiral de Grasse in his victory over the British off the Chesapeake Capes on September 5, 1781.