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Commanded by Brigadier General Daniel Tyler* 

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

First Brigade Colonel Erasmus Keyes
2nd Maine Infantry Regiment Colonel C. D. Jameson
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
Varian’s New York Battery Captain J. Varian mustered out 7/20
Second Brigade Brig. Gen. Robert C. Schenck**
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 New York State Militia Colonel G. W. B. Tompkins
New York Artillery, Battery B Captain Thaddeus P. Mott
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)
Lt. Colonel S.M. Elliott
2nd Wisconsin Infantry Regiment Colonel P. S. Coon
Lt. Colonel Henry W. Peck
3rd United States Artillery, Battery E Captain Romeyn B. Ayers
Fourth Brigade Colonel Israel Richardson
1st Massachusetts Infantry Regiment Colonel R. Cowdin
12th New York Infantry Regiment Colonel E. L. Walrath
2nd Michigan Infantry Regiment Major A. W. Williams
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

*Tyler’s commission was in the Connecticut militia
**Schenk’s commission was in the United States Volunteers