Major John B. Gallie
Killed in action while commanding the fort during the second attack of the monitor MONTAUK, February 1, 1863. The 32-pounder beside which he was standing was struck while Gallie was going from gun to gun, encouraging his men to calmness of aim.
Georgia Historical Commission 1963
Plaque courtesy Lat34North.com.
Original page, with additional info, here.
Photo credit: Byron Hooks of Lat34North.com.