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Commanded by Major General George B. McClellan
On March 3, 1862, President Lincoln created the first five army corps in the Army of the Potomac and appointed their commanders. This was done despite the protests of General McClellan, who wanted to delay until he had judged his division commanders in battle.
Headquarters |
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| Guards & Orderlies | ||
| Sturgis (Illinois) Rifles | from Provost Guard (below) | |
| McClellan Dragoons (Illinois) | from Cavalry Reserve (below) | |
| Oneida (New York) Cavalry Company | from Cavalry Reserve (below) | |
| 4th United States Cavalry, Cos. A & E | from Provost Guard (below) | |
| Provost Guard | Colonel Andrew Porter | |
| Sturgis (Illinois) Rifles | to Guards & Ordelies (above) | |
| 2nd United States Infantry Regiment | to Infantry Reserve (below) | |
| 2nd United States Cavalry Regiment | from Cavalry Reserve (below) | |
| 3rd United States Infantry, Companies BDGH&K | to Infantry Reserve (below) | |
| 4th United States Infantry Regiment | to Infantry Reserve (below) | |
| 6th United States Infantry Regiment | to Infantry Reserve (below) | |
| 8th United States Infantry, Cos. F&G | ||
| 4th United States Cavalry, Cos. A&E | to Guards & Ordelies (above) | |
| 5th United States Artillery, Battery K | to Artillery Reserve (below) | |
| Engineer Brigade | Lieutenant Colonel Daniel Woodbury (to BG 3/19) | |
| 15th New York Engineer Regiment | ||
| 50th New York Engineer Regiment | Colonel Charles B. Stuart | |
| Regular Engineer Battalion | ||
| Siege Artillery | ||
| 1st Connecticut Heavy Artillery | from Defenses Washington | |
| Infantry Reserve | Brigadier General George Sykes | |
| 2nd United States Infantry Regiment | ||
| 3rd United States Infantry, 6 Cos. | ||
| 4th United States Infantry Regiment | ||
| 6th United States Infantry Regiment | ||
| 10th United States Infantry, 4 Cos. | ||
| 11th United States Infantry Regiment | ||
| 12th United States Infantry Regiment | ||
| 14th United States Infantry Regiment | ||
| 17th United States Infantry, 4 Cos. | ||
| 5th New York Infantry Regiment | Colonel Gouverneur Warren | |
First Corps |
Major General Irvin McDowell | |
| First Division | Brigadier General Willliam B. Franklin | |
| Second Division | Brigadier General George A. McCall | |
| Third Division | Brigadier General Rufus King | |
Second Corps |
Brigadier General Edwin V. Sumner | |
| First Division | Brigadier General Israel B. Richardson | |
| Second Division | Brigadier General John Sedgwick | |
| Blenker’s Division | Brigadier General Louis Blenker | transferred to Dept. Mountains 3/31 |
Third Corps |
Brigadier General Samuel P. Heintzelman | |
| First Division | Brigadier General Fitz John Porter | |
| Second Division | Brigadier General Joseph Hooker | |
| Third Division | Brigadier General C. S. Hamilton | |
Fourth Corps |
Brigadier General Erasmus Keyes | |
| First Division | Brigadier General Darius N. Couch | |
| Second Division | Brigadier General William F. Smith | |
| Third Division | Brigadier General Silas Casey | |
Fifth Corps |
Major General Nathaniel P. Banks | |
| First Division | Brigadier General Alpheus S. Williams | |
| Second Division | Brigadier General John Shields | |
| Cavalry Command | Brigadier General John P. Hatch | |
Cavalry Reserve |
Brigadier General Philip St. George Cooke | |
| First Brigade | Colonel William H. Emory | |
| 5th United States Cavalry Regiment | ||
| 6th United States Cavalry Regiment | ||
| 6th Pennsylvania Cavalry Regiment | Colonel Richard H. Rush | |
| 2nd Brigade | Colonel George A.H. Blake | |
| 1st United States Cavalry Regiment | Lieutenant Colonel William N. Grier | |
| McClellan Dragoons (Illinois) | to Army Headquarters (above) | |
| Unattached | ||
| Oneida New York Cavalry | Captain Daniel P. Mann | to Army Headquarters (above) |
| 4th Pennsylvania Cavalry Regiment | Colonel David Campbell | |
| 2nd United States Cavalry Regiment | to Provost Guard (above) | |
| 4th United States Cavalry Regiment | to Army Headquarters (above) | |
Artillery Reserve |
Colonel Henry J. Hunt | |
| 1st New York Artillery Bn., Battery A | Captain Thomas H. Bates | |
| 1st New York Artillery Bn., Battery B | Captain Rufus T. Pettit | |
| 1st New York Artillery Bn., Battery C | ||
| 1st New York Artillery Bn., Battery D | Captain Thomas W. Osborn | |
| 5th New York Independent Battery | ||
| 1st United States Artillery, Battery E | from Hooker’s Division | |
| 1st United States Artillery, Battery H | to 3rd Corps, 2nd Div. Artilery | |
| 1st United States Artillery, Batteries G&K | ||
| 2nd United States Artillery, Battery A | ||
| 2nd United States Artillery, Battery B | ||
| 2nd United States Artillery, Battery E | from Porter’s Division | |
| 2nd United States Artillery, Battery L | ||
| 2nd United States Artillery, Battery M | from McDowell’s Division | |
| 3rd United States Artillery, Batteries C&G | from San Francisco via New York | |
| 3rd United States Artillery, Batteries F&K | ||
| 3rd United States Artillery, Batteries L&M | from San Francisco via New York | |
| 4th United States Artillery, Battery G | from Defenses Washington | |
| 4th United States Artillery, Battery K | ||
| 5th United States Artillery, Battery A | ||
| 5th United States Artillery, Battery I | from Defences Washington | |
| 5th United States Artillery, Battery K | from Provost Guard | |
| 5th United States Artillery, Battery M | from Defences Washington | |