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Commanded by:
Brigadier General James Cooper
(to July 7)
Brigadier General Christopher C. Augur

First Brigade Brigadier General James Cooper (to 7/16)
Brigadier General John W. Geary
3rd Maryland Infantry Regiment
102nd New York Infantry Regiment
109th Pensylvania Infantry Regiment Colonel Henry J. Stainrook
111th Pensylvania Infantry Regiment Colonel Matthew Schlaudecker
8th & 12th United States Infantry
Second Brigade Brigadier General John P. Slough (to 7/1)
Colonel James A. Tate 
(7/1 – 7/10)
Colonel Daniel Ullman 
(7/10 – 7/16)
Brigadier General Henry Prince 
(after 7/16)
3rd Delaware Infantry Regiment
1st District of Columbia Infantry Regt.
60th New York Infantry Regiment
78th New York Infantry Regiment
Purnell (Maryland) Legion Infantry
Artillery
1st New York Light Artillery, Battery L