Emilio describes personnel changes in October ( [BBR] pp.132-3):

Henry N. Hooper, formerly captain, Thirty-second Massachusetts Infantry, commissioned major of the Fifty-fourth, arrived October 16, and relieved Captain Emilio of the command. It was his fortune to lead the regiment for a longer period and in more actions than any other officer, owing to the assignment of Colonel Hallowell to higher command. On all occasions he proved an able and courageous soldier. Colonel Hallowell, promoted during his absence, returned the day after Major Hooper’s arrival, and was waited upon by the officers, who expressed their pleasure at his recovery and return. A stanch friend of the Fifty-fourth was a visitor in camp about this time, in the person of Albert G. Browne, Esq., the special agent of the Treasury Department, whose headquarters were at Beaufort. His son, Col. Albert G. Browne, Jr., was the military secretary of Governor Andrew, and also one of the regiment’s early and tried friends.

There had been several promotions in consequence of the action of July 18. Lieutenant Smith was made captain of Company G, but was still North; Lieutenant Walton,  captain of Company B, vice Willard, resigned. Second Lieutenants T. L. Appleton, Tucker, Howard, Pratt, and Littlefield were made first lieutenants. These officers were all present except Lieutenant Pratt, who never re-joined. Captain Bridge and Lieutenant Emerson had returned from sick leave. Lieutenants E. G. Tomlinson and Charles G. Chipman, appointed to the regiment, had joined. A number of the wounded had returned from hospital, and the first lot of furloughed men came back, and with them Capt. J. W. M. Appleton. By these accessions the Fifty-fourth had more officers and men present toward the last of October than at any time after it left St. Helena Island.