U.S. Army

Army of the Potomac

Major General George B. McClellan

On April 4, 1862 General McClellan's command was split, with the First Corps transferred to the newly-created Department of the Rappahannock and the Fifth Corps to the Department of the Shenandoah.

Headquarters

First Army Corps

Major General Irvin McDowell  

Transferred to the
Department of the Rapahannock 4/4

1st Division

Brigadier General W. B. Franklin

2nd Division

Brigadier General G. A. McCall

3rd Division

Brigadier General R. King

Second Army Corps

Major General Edwin V. Sumner

1st Division

Brigadier General I. B. Richardson

2nd Division

Brigadier General J. Sedgwick

Third Army Corps

Brigadier General Samuel P. Heintzelman

1st Division

Brigadier General Fitz John Porter

2nd Division

Brigadier General J. Hooker

3rd Division

Brigadier General C. S. Hamilton (until 4/30)
Brigadier General P. Kearney (after 4/30)

Fourth Army Corps

Brigadier General Erasmus Keyes

1st Division

Brigadier General D. N. Couch

2nd Division

Brigadier General W. F. Smith

3rd Division

Brigadier General S. Casey

Fifth Army Corps

Major General Nathaniel P. Banks

merged into Dept. of the Shenandoah 4/4

1st Division

Brigadier General A S. Williams

2nd Division

Brigadier General J. Shields

Cavalry Command

Brigadier General J. P. Hatch