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 organizationMultiple commander names indicate command succession of command during the battle or the campaign. during the battleThe 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 and the reports.Official Records, Series I, Volume II, pages, 1024-1026
Abbreviations used
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
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 OthersFirst 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):At this time the 3rd New York Independent Light Artillery formed a company of the regiment and was engaged. 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. StevensCommanded the regiment when Colonel McConnell was sick (see: Richardson's report) 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. HuntSecond 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):Companies C and G, 2nd Infantry; B, D, G, H, and K, 3rd Infantry; and G, 8th Infantry Maj George Sykes United States Marine Corps Battalion (4 companies): Maj John G. Reynolds United States Cavalry Battalion (7 companies):Companies A and E, 1st Cavalry; B, E, G, and I, 2nd Cavalry; and K, 2nd Dragoons. 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. ReynoldsThird 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): 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 WhitingFourth (Reserve) DivisionNot engaged
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 GilsaFifth Division
Col Dixon S. Miles First BrigadeIn reserve at Centreville and not engaged in the battle proper. Had some skirmishing with the enemy while covering the retreat of the Army
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:This consisted of the field guns of the 8th New York Militia, defended by detachments from the 8th and 29th New York Volunteer InfantryVarian's 1st Troop Washington Grays at civilwararchive.com 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
Notes
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.