First Battle of Bull Run order of battle: Union

The following units and commanders fought in the First Battle of Bull Run on the Union side. The Confederate order of battle is shown separately. Order of battle compiled from the army organization^[1] during the battle^[2] and the reports.^[3]

Abbreviations used

Military rank

BG = Brigadier General
Col = Colonel
Ltc = Lieutenant Colonel
Maj = Major
Cpt = Captain
Lt = Lieutenant

Other

Army of Northeastern Virginia

BG Irvin McDowell, Commanding

General Staff:

Chief of Artillery: Maj William F. Barry
Chief Engineer: Maj John G. Barnard
Chief Quartermaster: Cpt Otis H. Tillinghast (mw)

Division	Brigade	Regiments and Others
First Division BG Daniel Tyler	First Brigade Col Erasmus D. Keyes	1st Connecticut: Ltc John Speidel 2nd Connecticut: Col Alfred H. Terry 3rd Connecticut: Col John L. Chatfield 2nd Maine: Col Charles D. Jameson
	Second Brigade BG Robert C. Schenck	2nd New York (Militia):^[4] Col George W. B. Tompkins 1st Ohio: Col Alexander M. McCook 2nd Ohio: Ltc Rodney Mason 1st United States Artillery, Company G (Second Section): Lt Peter C. Hains 2nd United States Artillery, Company E: Cpt James H. Carlisle
	Third Brigade Col William T. Sherman	13th New York: Col Isaac F. Quinby 69th New York: Col Michael Corcoran (w&c), Cpt James Kelly 79th New York: Col James Cameron (k) 2nd Wisconsin: Ltc Henry W. Peck 3rd United States Artillery, Company E: Cpt Romeyn B. Ayres
	Fourth Brigade Col Israel B. Richardson	1st Massachusetts: Col Robert Cowdin 2nd Michigan: Maj Adolphus W. Williams 3rd Michigan: Col Daniel McConnell, Ltc Ambrose A. Stevens^[5] 12th New York: Col Ezra L. Walrath 1st United States Artillery, Company G (First Section): Lt John Edwards, Jr. 2nd United States Artillery, Company M: Cpt Henry J. Hunt
Second Division Col David Hunter (w) Col Andrew Porter	First Brigade Col Andrew Porter	8th New York (Militia): Col George Lyons 14th New York (Militia): Col Alfred M. Wood (w), Ltc Edward B. Fowler 27th New York: Col Henry W. Slocum (w), Maj Joseph J. Bartlett United States Infantry Battalion (8 companies):^[6] Maj George Sykes United States Marine Corps Battalion (4 companies): Maj John G. Reynolds United States Cavalry Battalion (7 companies):^[7] Maj Innis N. Palmer 5th United States Artillery, Company D: Cpt Charles Griffin
Second Division Col David Hunter (w) Col Andrew Porter	Second Brigade Col Ambrose Burnside	2nd New Hampshire: Col Gilman Marston (w), Ltc Frank S. Fiske 71st New York: Col Henry P. Martin 1st Rhode Island: Maj Joseph P. Balch 2nd Rhode Island: Col John S. Slocum (k), Ltc Frank Wheaton 2nd Rhode Island Battery: Cpt William H. Reynolds
Third Division Col Samuel P. Heintzelman (w)	First Brigade Col William B. Franklin	5th Massachusetts: Col Samuel C. Lawrence (w) 11th Massachusetts: Col George Clark, Jr. 1st Minnesota: Col Willis A. Gorman 4th Pennsylvania: Col John F. Hartranft 1st United States Artillery, Battery I: Cpt James B. Ricketts (w/c), Lt Edmund Kirby
	Second Brigade Col Orlando B. Willcox (w&c) Col J. H. Hobart Ward	1st Michigan: Maj Alonzo F. Bidwell 4th Michigan: Col Dwight A. Woodbury 11th New York: Ltc Noah L. Farnham (w) 38th New York: Col J. H. Hobart Ward, Ltc Addison Farnsworth 2nd United States Artillery, Company D: Cpt Richard Arnold
	Third Brigade Col Oliver O. Howard	3rd Maine: Maj Henry G. Staples 4th Maine: Col Hiram G. Berry 5th Maine: Col Mark H. Dunnell 2nd Vermont: Col Henry Whiting
Fourth (Reserve) Division^[8] BG Theodore Runyon	no brigade organization	1st New Jersey Militia: Col Aldolphus J. Johnson 2nd New Jersey Militia: Col Henry M. Baker 3rd New Jersey Militia: Col William Napton 4th New Jersey Militia: Col Matthew Miller, Jr. 1st New Jersey: Col William R. Montgomery 2nd New Jersey: Col George W. McLean 3rd New Jersey: Col George W. Taylor 41st New York: Col Leopold von Gilsa
Fifth Division Col Dixon S. Miles	First Brigade^[9] Col Louis Blenker	8th New York: Ltc Julius Stahel 29th New York: Col Adolph von Steinwehr 39th New York: Col Frederick G. D'Utassy 27th Pennsylvania: Col Max Einstein 2nd United States Artillery, Company A: Cpt John C. Tidball Brookwood's New York Battery:^[10] Cpt Charles Brookwood
Fifth Division Col Dixon S. Miles	Second Brigade Col Thomas A. Davies	16th New York: Ltc Samuel Marsh 18th New York: Col William A. Jackson 31st New York: Col Calvin E. Pratt 32nd New York: Col Roderick N. Matheson 2nd United States Artillery, Company G: Lt Oliver D. Greene

Notes

^ Multiple commander names indicate command succession of command during the battle or the campaign.
^ The Manassas Campaign, Virginia, July 21, 1861 - Union order of battle; Manassas National Battlefield Park - The Battle of First Manassas, Union order of battle; Official Records, Series I, Volume II, pages, 314-315
^ Official Records, Series I, Volume II, pages, 1024-1026
^ At this time the 3rd New York Independent Light Artillery formed a company of the regiment and was engaged.
^ Commanded the regiment when Colonel McConnell was sick (see: Richardson's report)
^ Companies C and G, 2nd Infantry; B, D, G, H, and K, 3rd Infantry; and G, 8th Infantry
^ Companies A and E, 1st Cavalry; B, E, G, and I, 2nd Cavalry; and K, 2nd Dragoons.
^ Not engaged
^ In reserve at Centreville and not engaged in the battle proper. Had some skirmishing with the enemy while covering the retreat of the Army
^ This consisted of the field guns of the 8th New York Militia, manned by detachments from the 8th and 29th New York Volunteer Infantry

References

Manassas National Battlefield Park - The Battle of First Manassas.
The Manassas Campaign, Virginia, July 21, 1861.
Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles, Volume 1 (Pdf), New York: The Century Co., 1887.
U.S. War Department, The War of the Rebellion: a Compilation of the Official Records of the Union and Confederate Armies, U.S. Government Printing Office, 1880–1901.

[1] Multiple commander names indicate command succession of command during the battle or the campaign.

[2] The Manassas Campaign, Virginia, July 21, 1861 - Union order of battle; Manassas National Battlefield Park - The Battle of First Manassas, Union order of battle; Official Records, Series I, Volume II, pages, 314-315

[3] Official Records, Series I, Volume II, pages, 1024-1026

[4] At this time the 3rd New York Independent Light Artillery formed a company of the regiment and was engaged.

[5] Commanded the regiment when Colonel McConnell was sick (see: Richardson's report)

[6] Companies C and G, 2nd Infantry; B, D, G, H, and K, 3rd Infantry; and G, 8th Infantry

[7] Companies A and E, 1st Cavalry; B, E, G, and I, 2nd Cavalry; and K, 2nd Dragoons.

[8] Not engaged

[9] In reserve at Centreville and not engaged in the battle proper. Had some skirmishing with the enemy while covering the retreat of the Army

[10] This consisted of the field guns of the 8th New York Militia, manned by detachments from the 8th and 29th New York Volunteer Infantry

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