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Commanded by Brigadier General Israel B. Richardson

On March 3, 1861 General Sumner was given command of the newly established 2nd Corps. Sumner’s Division became the 1st Division in that corps under the command of its senior brigadier general, Israel Richardson.

First Brigade Brig. Gen. Oliver O. Howard
5th New Hampshire Infantry Regiment Colonel Edward E. Cross
61st New York Infantry Regiment Lt. Colonel Francis Barlow
64th New York Infantry Regiment Colonel Thomas J. Parker
81st Pennsylvania Infantry Regiment Colonel James Miller
Second Brigade Brig. Gen. Thomas F. Meagher
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 Brig. Gen. William H. French
52nd New York Infantry Regiment Colonel Paul Frank
57th New York Infantry Regiment Colonel Samuel K. Zook
66th New York Infantry Regiment Colonel Joseph C. Pinckney
53rd Pennsylvania Infantry Regiment Colonel John R. Brooke
Artillery 
Battery B, 1st New York Artillery
Battery G, 1st New York Artillery Captain J. D. Frank
Battery A, 2nd New York Artillery Bn.  from defenses Washington
Batteries A&C, 4th United States Artillery