U.S. Army - Army of the Potomac

Fourth Army Corps

Major General Erasmus D. Keyes

First Division

Brigadier General

1st Brigade

Brigadier General O. O. Howard

2nd Brigade

Brigadier General T. F. Meagher

3rd Brigade

Brigadier General W. H. French

Artillery

First Division

Brigadier General

1st Brigade

Brigadier General W. A. Gorman

2nd Brigade

Brigadier General W. W. Burns

3rd Brigade

Brigadier General N. J. T. Dana

Artillery