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

Organization of the Union Army of Northeastern Virginia in the First Battle of Bull Run

Military rank

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

Other

• w = wounded
• mw = mortally wounded
• k = killed
• c = captured

Army of Northeastern Virginia

Main article: 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 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 (not present at battle):[8] 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: Col Noah L. Farnham (mw) 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[9]      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[10]    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:[11][12] Cpt Charles Brookwood
	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