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.
MG = Major General
BG = Brigadier General
Col = Colonel
Ltc = Lieutenant Colonel
Maj = Major
Cpt = Captain
Lt = 1st Lieutenant
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
MG George Henry Thomas
Headquarters
Provost guard:
9th Michigan Infantry: Col John Gibson Parkhurst
Escort:
1st Ohio Cavalry, Company L: Cpt John D. Barker
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
MG Thomas Leonidas Crittenden
Headquarters
Escort:
15th Illinois Cavalry, Company K: Cpt Samuel B. Sherer
MG Gordon Granger
BG Robert B. Mitchell
