The corps consisted of three cavalry divisions and twelve batteries of horse artillery.  Brigadier-General A. T. A. Torbert was in command of the First Division, which was composed of three brigades; Brigadier-General D. McM.  Gregg, of the Second, consisting of two brigades; and Brigadier-General J. H. Wilson was afterward assigned to command the Third, also comprising two brigades:  Captain Robinson, a veteran soldier of the Mexican war, was chief of artillery, and as such had a general supervision of that arm, though the batteries, either as units or in sections, were assigned to the different divisions in campaign.

Each one of my division commanders was a soldier by profession.  Torbert graduated from the Military Academy in 1855, and was commissioned in the infantry, in which arm he saw much service on the frontier, in Florida, and on the Utah expedition.  At the beginning of hostilities in April, 1861, he was made a colonel of New Jersey volunteers, and from that position was promoted in the fall of 1862 to be a brigadier-general, thereafter commanding a brigade of infantry in the Army of the Potomac till, in the redistribution of generals, after Grant came to the East, he was assigned to the First Cavalry Division.

Gregg graduated in 1855 also, and was appointed to the First Dragoons, with which regiment, up to the breaking out of the war, he saw frontier service extending from Fort Union, New Mexico, through to the Pacific coast, and up into Oregon and Washington Territories, where I knew him slightly.  In the fall of 1861 he became colonel of the Eighth Pennsylvania Cavalry, and a year later was made a brigadier-general.  He then succeeded to the command of a division of cavalry, and continued in that position till the close of his service, at times temporarily commanding the Cavalry Corps.  He was the only division commander I had whose experience had been almost exclusively derived from the cavalry arm.

Wilson graduated in 1860 in the Topographical Engineers, and was first assigned to duty in Oregon, where he remained till July, 1861.  In the fall of that year his active service in the war began, and he rose from one position to another, in the East and West, till, while on General Grant’s staff, he was made a brigadier-general in the fall of 1863 in reward for services performed during the Vicksburg campaign and for engineer duty at Chattanooga preceding the battle of Missionary Ridge.  At my request he was selected to command the Third Division.  General Grant thought highly of him, and, expecting much from his active mental and physical ability, readily assented to assign him in place of General Kilpatrick.  The only other general officers in the corps were Brigadier-General Wesley Merritt, Brigadier-General George A. Custer, and Brigadier-General Henry E. Davies, each commanding a brigade.