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Commanded by:
Colonel David Hunter (w 7/21)
Colonel Andrew Porter

The Battle of Bull Run (Manassas) was fought on July 21.

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
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
71st New York Infantry Regiment Colonel H. P. Martin left for New York to muster out 7/31