On August 13, 1864, General Burnside was granted a leave of absence; he never rejoined the corps, but was succeeded by General Parke, who remained in command until the close of the war. At the battle of the Weldon Railroad, August 19–21, 1864, the three divisions of White, Potter, and Willcox were engaged with considerable loss, although the three combined numbered less than 6,000 muskets; casualties were 60 killed and 315 wounded. By this time the divisions had become so reduced in numbers that a reorganization of the corps became necessary, and so the regiments in White's Division were transferred to the divisions of Potter and Willcox. Under this arrangement Willcox's Division was numbered as the 1st; Potter's, as the 2nd; Ferrero's black troops were designated as the 3rd Division. But in December, Ferrero's Division was permanently detached, and most of his regiments were transferred to the newly organized XXV Corps, which was composed entirely of black troops. General Ferrero himself was assigned to a provisional command at Bermuda Hundred.