Medal of Honor Action Place: Mobile Bay, Alabama, USA
As captain of a gun on board the U.S.S. Richmond during action against rebel forts and gunboats and with the ram Tennessee in Mobile Bay, 5 August 1864. Despite damage to his ship and the loss of several men on board as enemy fire raked her decks, Duncan fought his gun with skill and courage throughout the prolonged battle, which resulted in the surrender of the rebel ram Tennessee and in the successful attacks carried out on Fort Morgan.
Accredited to: Boston, Suffolk County, Massachusetts
Awarded Posthumously: No
Born: 1833, Sullivan, Hancock County, ME, United States