U.S. Army - Army of the Potomac

First Army Corps

Major General John F. Reynolds

First Division

Brigadier General J.S. Wadsworth

1st Brigade

Colonel Walter Phelps, Jr. (until 5/30)

Colonel E. B. Fowler (after 5/30)

2nd Brigade

Brigadier General Lysander Cutler

3rd Brigade

Brigadier General Gabriel B. Paul

4th Brigade

Brigadier General Solomon Meredith

Second Division

Brigadier General J.C. Robinson

1st Brigade

Colonel Adrian R. Root (until 5/11)

Coloenl T. F. McCoy (5/11 - 5/21)

Colonel S. H. Leonard (after 5/21)

2nd Brigade

Brigadier General Henry Baxter

3rd Brigade

Colonel Samuel H. Leonard (until 5/20)

discontinued 5/20

Third Division

Brigadier General A. Doubleday

1st Brigade

Brigadier General Thomas R. Rowley

2nd Brigade

Brigadier General Roy Stone

Artilery Brigade

Colonel Charles Wainwright

2nd Maine Battery

Captain James A. Hall

from 2nd Div. artillery

5th Maine Battery

Lieutenant Greenleaf T. Stevens

from 2nd Div. artillery

Battery L, 1st New York Artillery

Captain John A. Reynolds

from 1st Div. artillery

Battery B, 1st Pennsylvania Artillery

Captain James H. Cooper

from 3rd Div. artillery

Battery B, 4th United States Artillery

Lieutenant James Stewart

from 1st Div. artillery

1st Maine Cavalry, Co. L

Captain Constantine Taylor