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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 |