Defences of Washington

Major General Samuel P. Heintzelman

Abercrombie's Division

Brigadier General J. J. Abercrombie

Provisional Brigade

Colonel Clarence Buell

Second Brigade

Brigadier General R. Cowden

Third Brigade

Colonel William Gurney

Casey's Division

Major General Silas Casey

First Brigade

Colonel Frank Fessenden

Second Brigade

Brigadier General E. H. Stoughton

Third Brigade

Brigadier General Alexander Hays

Defences North of the Potomac

Lt. Colonel J. A. Haskins

First Brigade

Second Brigade

Third Brigade

Distict of Alexandria

Brigadier General John P. Slough

1st District of Columbia Infantry Regt.

26th Michigan Infantry Regiment

153rd New York Infantry Regiment

11th Rhode Island Infantry Regiment

Artillery, Distict of Alexandria

Brigadier General John Tyler

34th Massachusetts Infantry Regiment

1st Connecticut Heavy Artillery

19th Connecticut Infantry Regiment

1st Massachusetts Heavy Artillery

2nd New York Heavy Artillery

3rd New York Heavy Artillery Battalion

1st Wisconsin Heavy Artillery

Whipple's Command

Bde. Gen. A. W. Whipple

1st Massachusetts Heavy Artillery

2nd New York Heavy Artillery Regiment

4th New York Heavy Artillery Regiment

11th New York Independent Battery

12th New York Independent Battery

1st Wisconsin Heavy Artillery

Grover's Brigade

Colonel A. B. Jewett

22nd Maine Infantry Regiment

23rd Maine Infantry Regiment

39th Massachusetts Infantry Regiment

14th New Hampshire Infantry Regiment

10th Vermont Infantry Regiment

10th Massachusetts Battery

Cavalry Brigade

Colonel R. Butler Price

1st Michigan Cavalry Regiment

5th New York Cavalry Regiment

1st Ohio Cavalry, Cos. A & C

2nd Pennsylvania Cavalry Regiment

1st Vermont Cavalry Regiment

1st West Verginia Cavalry Regiment

Uassigned Infantry

2nd District of Columbia Infantry Regt.

10th New Jersey Infantry Regiment

26th Pennsylvania Infantry Regiment

27th Pennsylvania Infantry, Company F

135th Pennsylvania Infantry Regiment

143rd Pennsylvania Infantry Regiment

149th Pennsylvania Infantry Regiment

150th Pennsylvania Infantry Regiment

151st Pennsylvania Infantry Regiment

Unassigned Artillery

9th New York Independent Battery

16th New York Independent Battery

19th New York Independent Battery

27th New York Independent Battery

West Virginia Artillery, Battery A

Cavalry

11th New York Cavalry Regiment