Battle of Chickamauga order of battle: Union

The following Union Army units and commanders fought in the Battle of Chickamauga of the American Civil War. The Confederate order of battle is listed separately. Order of battle compiled from the army organization during the campaign.

Military Rank

 * MG = Major General
 * BG = Brigadier General
 * Col = Colonel
 * Ltc = Lieutenant Colonel
 * Maj = Major
 * Cpt = Captain
 * Lt = 1st Lieutenant

Other

 * w = wounded
 * mw = mortally wounded
 * k = killed

Army of the Cumberland
MG William Rosecrans, Commanding

General Staff

Chief of Staff: BG James A. Garfield
 * Col James Barnett, Chief of Artillery
 * Col William Truesdale
 * Col John P. Sanderson, ADC
 * Col Joseph C. McKibbin, ADC
 * Ltc Calvin Goddard, Adjutant General
 * Ltc Arthur C. Ducat, Inspector General
 * Ltc Henry C. Hodges, Quartermaster General
 * Ltc Samuel Simmons, Commissary of Subsistence
 * Ltc William M. Wiles, Provost Marshal General
 * Maj William M. McMichael, Adjutant General
 * Maj Frank S. Bond, ADC
 * Cpt Horace Porter, Chief of Ordnance
 * Cpt Andrew S. Burt, Acting Inspector General
 * Cpt Hunter Brooke, Acting Judge Advocate General
 * Cpt William E. Merrill, Topographical Engineer
 * Cpt William C. Margedant, Topographical Engineer
 * Cpt Jesse Merrill, Signal Officer
 * Cpt John C. Van Duzer, Telegraph
 * Cpt R.S. Thomas, ADC
 * Cpt James P. Drouillard, ADC
 * Cpt Charles R. Thompson, ADC
 * Cpt William Farrar, ADC
 * Lt M.J. Kelly, Chief of Couriers
 * Lt George Burroughs, Engineer
 * Lt William L. Porter, Acting ADC
 * Lt James K. Reynolds, Acting ADC
 * Glover Perin, Surgeon
 * Henry H. Seys, Surgeon
 * D. Bache, Assistant Surgeon
 * Jeremiah F. Trecy, Chaplain

General Headquarters
 * 1st Battalion, Ohio Sharpshooters: Cpt Gershom M. Barber
 * 10th Ohio Infantry: Ltc William M. Ward
 * 15th Pennsylvania Cavalry: Col William J. Palmer

Pioneer Brigade

BG James St. Clair Morton, Chief Engineer (w)
 * 1st Pioneer Battalion
 * 2nd Pioneer Battalion
 * 3rd Pioneer Battalion

XIV Corps
MG George Henry Thomas

Headquarters

Provost guard:
 * 9th Michigan Infantry: Col John Gibson Parkhurst

Escort:
 * 1st Ohio Cavalry, Company L: Cpt John D. Barker

XX Corps
MG Alexander McDowell McCook

Headquarters

Provost guard: 81st Indiana Infantry, Company H: Cpt William J. Richards

Escort: 2nd Kentucky Cavalry, Company I: Lt George W. L. Batman

XXI Corps
MG Thomas Leonidas Crittenden

Headquarters

Escort: 15th Illinois Cavalry, Company K: Cpt Samuel B. Sherer

Reserve Corps
MG Gordon Granger

Cavalry Corps
BG Robert B. Mitchell