On board the USS Richmond during action against rebel forts and gunboats and with the ram Tennessee in Mobile Bay, 5 August 1864. Cool and courageous although he had just come off the sick list, Chandler rendered gallant service throughout the prolonged action as his ship maintained accurate fire against Fort Morgan and ships of the Confederacy despite extremely heavy return fire. He participated in the actions at Forts Jackson and St. Philip, with the Chalmette batteries, at the surrender of New Orleans and in the attacks on batteries below Vicksburg.