Battle of Chickamauga - Opposing Forces

Opposing Forces

Further information: Confederate order of battle, and Union order of battle

The Union Army of the Cumberland, commanded by Rosecrans, consisted of about 60,000 men, composed of the following major organizations:

• XIV Corps, commanded by Maj. Gen. George H. Thomas, 22,781 present for duty with division commanders Brig. Gen. Absalom Baird, Maj. Gen. James S. Negley, Brig. Gen. John M. Brannan, and Maj. Gen. Joseph J. Reynolds.
• XX Corps, commanded by Maj. Gen. Alexander McD. McCook, 13,156 present with division commanders Brig. Gen. Jefferson C. Davis, Brig. Gen. Richard W. Johnson, and Maj. Gen. Philip H. Sheridan.
• XXI Corps, commanded by Maj. Gen. Thomas L. Crittenden, 14,660 present with division commanders Brig. Gen. Thomas J. Wood, Maj. Gen. John M. Palmer, and Brig. Gen. Horatio P. Van Cleve.
• Reserve Corps, commanded by Maj. Gen. Gordon Granger, 7,372 present with one division commanded by Brig. Gen. James B. Steedman and an attached brigade of Col. Daniel McCook.
• Cavalry Corps, commanded by Brig. Gen. Robert B. Mitchell, 10,078 present with division commanders Brig. Gen. George Crook, and Col. Edward M. McCook.

The Confederate Army of Tennessee, commanded by Bragg, with about 65,000 men, was composed of the following major organizations:

• The Right Wing, commanded by Lt. Gen. Leonidas Polk, contained the division of Maj. Gen. Benjamin F. Cheatham, Hill's Corps of Lt. Gen. D.H. Hill (divisions of Maj. Gens. Patrick R. Cleburne and John C. Breckinridge) and the Reserve Corps of Maj. Gen. William H. T. Walker (divisions of Brig. Gen. States Rights Gist and St. John R. Liddell).
• The Left Wing, commanded by Lt. Gen. James Longstreet, contained the division of Maj. Gen. Thomas C. Hindman, Buckner's Corps of Maj. Gen. Simon B. Buckner (divisions of Maj. Gen. Alexander P. Stewart and Brig. Gens. William Preston and Bushrod R. Johnson) and Longstreet's Corps, commanded by Maj. Gen. John Bell Hood (divisions of Maj. Gens. Lafayette McLaws and Hood).
• A cavalry corps, commanded by Maj. Gen. Joseph Wheeler, contained the divisions of Brig. Gens. John A. Wharton and William T. Martin.
• A second cavalry corps, commanded by Brig. Gen. Nathan Bedford Forrest, contained the divisions of Brig. Gens. Frank C. Armstrong and John Pegram.

The organization of the Army of Tennessee into Wings was ordered the night of September 19 upon the arrival of Longstreet from Virginia. Prior to this, the corps commanders reported directly to Bragg.