U.S. Army - Army of the Potomac

Third Army Corps

Brigadier General Samuel P. Heintzelman

Created March 3, 1862 and announced March 13.

First Division

Brigadier General Fitz John Porter

1st Brigade

Brigadier General J. H. Martindale

2nd Brigade

Brigadier General George Morrell

3rd Brigade

Brigadier General Daniel Butterfield

Second Division

Brigadier General Joseph Hooker

1st Brigade

Brigadier General H. M. Naglee

2nd Brigade

Colonel Nelson Taylor

3rd Brigade

Colonel S. M. Starr

Third Division

Brigadier General C. S. Hamilton

1st Brigade

Brigadier General C. D. Jameson

2nd Brigade

Brigadier General David B. Birney

3rd Brigade

Brigadier General H. G. Berry

Artillery

1st Rhode Island Artillery, Battery E

1st New Jersey Artillery, Battery B

2nd United States Artillery, Battery G

Cavalry

3rd Pensylvania Cavalry Regiment

Colonel William W. Averill