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Commanded by Brigadier General Irvin McDowell
The Battle of Bull Run, or Manassas, was fought on July 21.
1st Division |
Brigadier General Daniel Tyler** | |
| First Brigade | Colonel Erasmus Keyes | |
| 1st Connecticut Infantry Regiment | Lieutenant Colonel Speidel | mustered out 7/31 |
| 2nd Connecticut Infantry Regiment | Colonel A. H. Terry | |
| 3rd Connecticut Infantry Regiment | Colonel J. Chatfield | |
| 2nd Maine Infantry Regiment | Colonel C. D. Jameson | |
| Varian’s New York Battery | Captain J. Varian | mustered out 7/20 |
| Second Brigade | Brigadier General Robert C. Schenck* | |
| 2nd New York State Militia | Colonel G. W. B. Tompkins | |
| New York Artillery, Battery B | Captain Thaddeus P. Mott | |
| 1st Ohio Infantry Regiment | Colonel A. McCook | return to Ohio to muster out 7/30 |
| 2nd Ohio Infantry Regiment | Colonel L. Wilson Lt. Colonel Rodney Mason |
mustered out 7/31 |
| 2nd United States Artillery, Battery E | Captain Carlisle | |
| Third Brigade | Colonel W. T. Sherman | |
| 13th New York Infantry Regiment | Colonel Isaac F. Quinby | |
| 69th New York State Militia | Colonel Michael Corcoran (w/c 7/21) Captain James Kelly |
left for New York to muster out 7/27 |
| 79th New York Infantry Regiment | Colonel J. Cameron (k 7/21) Lieutenant Colonel S.M. Elliott |
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| 2nd Wisconsin Infantry Regiment | Colonel P. S. Coon Lieutenant Colonel Henry W. Peck |
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| 3rd United States Artillery, Battery E | Captain Romeyn B. Ayers | |
| Fourth Brigade | Colonel Israel Richardson | |
| 1st Massachusetts Infantry Regiment | Colonel R. Cowdin | |
| 2nd Michigan Infantry Regiment | Major A. W. Williams | |
| 12th New York Infantry Regiment | Colonel E. L. Walrath | |
| 3rd Michigan Infantry Regiment | Colonel D. McConnel Lieutenant Colonel Stevens |
|
| 1st United States Artillery, Battery G | Lieutenant J. Edwards | |
| 2nd United States Artillery, Battery M | Captain H. J. Hunt | |
2nd Division |
Colonel David Hunter | |
| First Brigade | Colonel Andrew Porter | |
| 8th New York State Militia | Colonel G. Lyons | to New York to muster out 7/23 |
| 14th New York State Militia | Colonel A. M. Wood (w 7/21) Lt. Colonel Edward B. Fowler |
|
| 27th New York Infantry Regiment | Colonel Henry W. Slocum (w 7/21) Major Joseph J. Bartlett |
Arrived from New York 7/17 |
| 35th New York Infantry Regiment | Colonel A. M. Wood | from Dist. Washington 7/27 |
| 2nd United States Infantry, Cos. C & K 3rd U.S., Cos. B, D, G, H & K 8th U. S., Co. G |
Major George Sykes | |
| 1st United States Cavalry, Cos. A & E 2nd U. S. Dragoons, Co. K 2nd U. S. Cavalry, Cos. B, E, G & I |
Major I. N. Palmer | |
| United States Marine Battalion | Major J. G. Reynolds | |
| Second Brigade | Colonel Ambrose Burnside | |
| 2nd New Hampshire Infantry Regiment | Colonel Gilman Marston (w 7/21) Lt. Colonel Frank S. Fiske |
|
| 71st New York Infantry Regiment | Colonel H. P. Martin | left for New York to muster out 7/31 |
| 1st Rhode Island Infantry Regiment | Major J. P. Balch | left for Rhode Island to muster out 7/25 |
| 2nd Rhode Island Infantry Regiment | Colonel J. S. Slocum (k 7/21) Lt. Colonel F. Wheaton |
|
| 1st Rhode Island Artillery, Battery A | Captain William H. Reynolds | |
3rd Division |
Colonel Samuel P. Heintzelman | |
| First Brigade | Colonel William B. Franklin | |
| 5th Massachusetts Infantry Regiment | Colonel S. C. Lawrence (w 7/21) | from Dept. Washington 7/16 to Boston to muster out 7/29 |
| 11th Massachusetts Infantry Regiment | Colonel G. Clark | |
| 1st Minnesota Infantry Regiment | Colonel W. A. Gorman | from Dept. Washington 7/3 |
| 4th Pennsylvania Infantry Regiment | Colonel John Hartranft | refused to extend service on eve of battle and mustered out 7/20 |
| 5th Pennsylvania Infantry Regiment | Colonel R. P. McDowell | remained at Alexandria during battle and mustered out at Harrisburg 7/25 |
| 1st United States Artillery, Battery I | Captain J. B. Ricketts (w&c 7/21) Lieutenant E. Kirby |
|
| Second Brigade | Colonel Orlando B. Wilcox (w&c 7/21) Colonel J. H. Hobart Ward |
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| 1st Michigan Infantry Regiment | Major A. F. Bidwell | |
| 4th Michigan Infantry Regiment | Colonel D. A. Woodbury | |
| 11th New York Infantry Regiment | Colonel Noah L. Farnham (mw 7/21) Lieutenant Colonel John A. Cregier |
|
| 38th New York Infantry Regiment | Colonel J. H. Ward (^ 7/21) Lieutenant Colonel Addison Farnsworth |
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| 2nd United States Artillery, Battery D | Captain Richard Arnold | |
| Third Brigade | Colonel Oliver O. Howard | |
| 3rd Maine Infantry Regiment | Major H. G. Staples | |
| 4th Maine Infantry Regiment | Colonel H. G. Berry | |
| 5th Maine Infantry Regiment | Colonel M. H. Dunnell | |
| 2nd Vermont Infantry Regiment | Colonel H. Whiting | |
4th Division |
Brigadier General Theodore Runyon | |
| First Brigade | ||
| 1st New Jersey State Militia | Colonel Adolphus J. Johnson | from Dist. Washington |
| 2nd New Jersey State Militia | Colonel Henry M. Baker | from Dist. Washington |
| 3rd New Jersey State Militia | Colonel William Napton | from Dist. Washington |
| 4th New Jersey State Militia | Colonel Matthew Miller, Jr. | from Dist. Washington |
| Second Brigade | ||
| 1st New Jersey Infantry Regiment | Colonel William R. Montgomery | from New Jersey 7/1 |
| 2nd New Jersey Infantry Regiment | Colonel George W. McLean | from New Jersey 7/1 |
| 3rd New Jersey Infantry Regiment | Colonel George W. Taylor | from New Jersey 7/1 |
| 41st New York Infantry Regiment | Colonel Leopold Von Gilsa | from New York 7/10 |
5th Division |
Colonel Dixon S. Miles | |
| First Brigade | Colonel Louis Blenker | |
| 8th New York Infantry Regiment | Lieutenant Colonel J. Stahel | |
| 29th New York Infantry Regiment | Colonel Adolph Von Steinwehr | |
| 39th New York Infantry Regiment | Colonel Frederick G. D’Utassy | |
| 27th Pennsylvania Infantry Regiment | Colonel Max Einstein | from Dept. Washington |
| 2nd United States Artillery, Battery A | Captain J. C. Tidball | |
| Bookwood’s New York Battery | Captain Charles Bookwood (29th NY) | ***see note below |
| Second Brigade | Colonel T. Davies | |
| 16th New York Infantry Regiment | Lieutenant Colonel S. Marsh | |
| 18th New York Infantry Regiment | Colonel William A. Jackson | |
| 31st New York Infantry Regiment | Colonel Calvin E. Pratt | |
| 32nd New York Infantry Regiment | Colonel Roderick Matheson | from New York 7/1 |
| 2nd United States Artillery, Battery G | Lieutenant O. D. Greene | |
*Commission in the United States Volunteers
**Commission in the militia
*** The guns of the Varian’s Battery (mustered out) were manned by men of the 8th and 29th New York on 7/21