U.S. Army -22nd Army Corps - Department of Washington

Defences South of the Potomac

Brigadier General Robert O. Tyler (until 4/26)

Colonel T. R. Tannatt

organized April 15 from Artillery Defences of Alexandria

First Brigade

Colonel T. R. Tannatt

1st Massachusetts Heavy Artillery

from Artillery Defences Alexandria

10th Michigan Battery

from Artillery Camp

2nd New York Heavy Artillery

from Artillery Defences Alexandria

3rd New York Heavy Artillery Battalion

from Artillery Defences Alexandria

4th New York Heavy Artillery

from Abercrombie's Div.

1st Wisconsin Heavy Artillery, Bat. A

from Artillery Defences Alexandria

Second Brigade

Colonel G. D. Wells

1st Connecticut Heavy Artillery

from Artillery Defences Alexandria

19th Connecticut Infantry Regiment

from Artillery Defences Alexandria

34th Massachusetts Infantry Regiment

from Artillery Defences Alexandria

16th West Virginia Infantry Regiment

from 2nd Bde., Abercrombie's Div.