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Commanded by 
Brigadier General George Stoneman
(to August 15)
Brigadier General Israel B. Richardson

First Brigade Brigadier General John C. Caldwell
5th New Hampshire Infantry Regiment Lt. Colonel Samuel G. Langley
7th New York Infantry Regiment Colonel George Von Schack
61st New York Infantry Regiment Lt. Colonel Francis Barlow
64th New York Infantry Regiment Captain Rufus Washburg from 3 Brig. (below)
81st Pennsylvania Infantry Regiment Lt. Colonel Charles F. Johnson
Second (Irish) Brigade Colonel R. Nugent (to 8/8)
Brig. Gen. Thomas F. Meagher
29th Massachusetts Infantry Regiment Colonal Ebenezer Peirce
63rd New York Infantry Regiment Colonel John Burke
69th New York Infantry Regiment Colonel Robert Nugent
88th New York Infantry Regiment Colonel Henry M. Baker
Third Brigade Colonel John R. Brooke (to 8/10)
Brig. Gen. William H. French

2nd Delaware Infantry Regiment Colonel Henry Wharton
52nd New York Infantry Regiment Colonel Paul Frank
57th New York Infantry Regiment Colonel Samuel K. Zook
64th New York Infantry Regiment Captain Rufus Washburg to 1 Brig. (above)
66th New York Infantry Regiment Colonel Joseph C. Pinckney
53rd Pennsylvania Infantry Regiment Colonel John R. Brooke
Artillery  
Batteries A&C, 4th United States Artillery