The following

Union Army During the American Civil War, the Union Army, also known as the Federal Army and the Northern Army, referring to the United States Army, was the land force that fought to preserve the Union (American Civil War), Union of the collective U.S. st ...

units and commanders fought in the

Battle of Chickamauga The Battle of Chickamauga, fought on September 19–20, 1863, between United States, U.S. and Confederate States of America, Confederate forces in the American Civil War, marked the end of a Union Army, Union offensive, the Chickamauga Campaign ...

of the

American Civil War The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states th ...

. The Confederate order of battle is listed separately. Order of battle compiled from the army organization during the campaign.

Abbreviations used

Military Rank

* MG =

Major General Major general (abbreviated MG, maj. gen. and similar) is a military rank used in many countries. It is derived from the older rank of sergeant major general. The disappearance of the "sergeant" in the title explains the apparent confusion of a ...

* BG =

Brigadier General Brigadier general or Brigade general is a military rank used in many countries. It is the lowest ranking general officer in some countries. The rank is usually above a colonel, and below a major general or divisional general. When appointed ...

* Col =

Colonel Colonel (abbreviated as Col., Col or COL) is a senior military officer rank used in many countries. It is also used in some police forces and paramilitary organizations. In the 17th, 18th and 19th centuries, a colonel was typically in charge of ...

* Ltc =

Lieutenant Colonel Lieutenant colonel ( , ) is a rank of commissioned officers in the armies, most marine forces and some air forces of the world, above a major and below a colonel. Several police forces in the United States use the rank of lieutenant colone ...

* Maj =

Major Major (commandant in certain jurisdictions) is a military rank of commissioned officer status, with corresponding ranks existing in many military forces throughout the world. When used unhyphenated and in conjunction with no other indicators ...

* Cpt =

Captain Captain is a title, an appellative for the commanding officer of a military unit; the supreme leader of a navy ship, merchant ship, aeroplane, spacecraft, or other vessel; or the commander of a port, fire or police department, election precinct, e ...

* Lt =

1st Lieutenant First lieutenant is a commissioned officer military rank in many armed forces; in some forces, it is an appointment. The rank of lieutenant has different meanings in different military formations, but in most forces it is sub-divided into a s ...

Other

* w = wounded * mw =

mortally wounded : A mortal wound is an injury that will ultimately lead to a person's death. wiktionary:mortal, ''Mortal'' refers to the mortality of a human: whether they are going to live or die."mortal_adjective." Oxford Advanced Learner's Dictionary. 2018. O ...

* k = killed

Army of the Cumberland

MG William Rosecrans, Commanding General Staff
Chief of Staff: BG

James A. Garfield James Abram Garfield (November 19, 1831 – September 19, 1881) was the 20th president of the United States, serving from March 4, 1881 until his death six months latertwo months after he was shot by an assassin. A lawyer and Civil War gene ...

* Col James Barnett, Chief of Artillery * Col William Truesdale * Col

John P. Sanderson ''For the political leader in Florida see John Pease Sanderson'' John Phillip Sanderson (February 13, 1818 – October 14, 1864) was a soldier, influential politician, lawyer, author, newspaper editor, and member of the Pennsylvania General Assem ...

, ADC * Col

Joseph C. McKibbin Joseph Chambers McKibbin (May 14, 1824 – July 1, 1896) was an American lawyer, Civil War veteran, and California Democratic politician who served one term in the United States House of Representatives from 1857 to 1859. Early life and ...

, ADC * Ltc Calvin Goddard, Adjutant General * Ltc

Arthur C. Ducat Arthur Charles Ducat, Sr. (February 24, 1830 – January 29, 1896) was an officer in the Union Army during the American Civil War. After the Civil War, Ducat was an insurance industry executive and fire prevention specialist. Biography Ducat ...

, Inspector General * Ltc

Henry C. Hodges Henry Clay Hodges (January 14, 1831 – November 3, 1917) was a U.S. Army officer serving as a quartermaster in various places throughout the United States, including during the American Civil War. Early years Born in Rutland County, Vermont, Rut ...

, 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 The 15th Pennsylvania Cavalry Regiment, known as the Anderson Cavalry and the 160th Volunteers, was a three-year cavalry regiment in the Union Army during the American Civil War. It was recruited and formed in the summer of 1862 by officers a ...

: Col William J. Palmer Pioneer Brigade
BG

James St. Clair Morton James St. Clair Morton (September 24, 1829 – June 17, 1864) was an American military officer who served as chief engineer of the Army of the Ohio, the Army of the Cumberland and the XI Corps in the Union Army during the American Civil War. ...

, Chief Engineer (w) * 1st Pioneer Battalion * 2nd Pioneer Battalion * 3rd Pioneer Battalion

XIV Corps

George Henry Thomas George Henry Thomas (July 31, 1816March 28, 1870) was an American general in the Union Army during the American Civil War and one of the principal commanders in the Western Theater. Thomas served in the Mexican–American War and later chose ...

Headquarters Provost guard: * 9th Michigan Infantry:Not engaged; guarding trains and performing provost duty. Col John Gibson Parkhurst Escort: *

1st Ohio Cavalry The 1st Ohio Cavalry Regiment was a cavalry regiment that served in the Union Army during the American Civil War. Service The 1st Ohio Cavalry Regiment was organized at Camp Chase in Columbus, Ohio August 17-October 30, 1861, and mustered in for ...

, Company L: Cpt John D. Barker

XX Corps

Alexander McDowell McCook Alexander McDowell McCook (April 22, 1831June 12, 1903) was a career United States Army officer and a Union general in the American Civil War. Early life McCook was born in Columbiana County, Ohio. A Scottish family, the McCooks were prominent i ...

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

Thomas Leonidas Crittenden Thomas Leonidas Crittenden (May 15, 1819 – October 23, 1893) was a lawyer, politician, and Union general during the American Civil War. Early life Crittenden was born in Russellville, Kentucky, the son of U.S. Senator John J. Crittenden, who l ...

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

Reserve Corps

MG Gordon Granger

Cavalry Corps

Robert B. Mitchell Robert Byington Mitchell (April 4, 1823January 26, 1882) was a brigadier general in the Union Army during the American Civil War and the Governor of the New Mexico Territory from 1866 to 1869. Early life and career Mitchell was born on April 4, ...

Notes

References

* U.S. War Department
''The War of the Rebellion''
''a Compilation of the

Official Records The ''Official Records of the Union and Confederate Armies in the War of the Rebellion'', commonly known as the ''Official Records of the Union and Confederate Armies'' or Official Records (OR or ORs), is the most extensive collection of Americ ...

of the Union and Confederate Armies'', U.S. Government Printing Office, 1880–1901.
Civil War Home: The Chickamauga Campaign. Union Order of Battle

* {{cite book, last1=Richardson, first1=Maj. Robert D., title=ROSECRANS' STAFF AT CHICKAMAUGA: THE SIGNIFICANCE OF MAJOR GENERAL WILLIAM S. ROSECRANS' STAFF ON THE OUTCOME OF THE CHICKAMAUGA CAMPAIGN , url=http://apps.dtic.mil/dtic/tr/fulltext/u2/a211801.pdf, archive-url=https://web.archive.org/web/20160819082006/http://www.dtic.mil/dtic/tr/fulltext/u2/a211801.pdf, url-status=live, archive-date=August 19, 2016, date=1989, location=Fort Leavenworth, Kansas American Civil War orders of battle Union order of battle William Rosecrans George Henry Thomas