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Commanded by Major General Robert C. Schenck

8th Corps

Defenses Upper Potomac Brigadier General Benjamin F. Kelly
Harpers Ferry Brigade Brigadier General John R. Kenly  from Williamsport, Maryland Brig.
Martinsburg Brigade Colonel A. T. McReynolds
Milroy’s Division Brigadier General Robert H. Milroy
District of the Eastern Shore/
First Separate Brigade
 Henry H. Lockwood  redesignated 1/5
1st Maryland Eastern Shore Regiment Colonel James Wallace
2nd Maryland Eastern Shore Regiment Major Robert S. Rogers (Col. 1/28)
Purnell Legion Cavalry (Md) Co. A
Smith’s Maryland Cavalry Company Captain G.W.P. Smith
Defences of Baltimore/
Second Separate Brigade
 Colonel William H. Morris  redesignated 1/5
1st Connecticut Cavalry from 11th Corps 
18th Connecticut Infantry Regiment Colonel William G. Ely
3rd Delaware Infantry Regiment Colonel Samuel H. Jenkins
17th Indiana Battery
Purnell Legion Cavalry (Md) Co C
Purnell Legion Infantry (Md) Cos. B & C Colonel Samuel A. Graham
14th New Jersey Infantry Regiment Colonel William S. Truex
5th New York Heavy Artillery Colonel Samuel Graham
6th New York Heavy Artillery
Colonel William H. Morris
8th New York Heavy Artillery
Colonel Peter A. Porter
150th New York Infantry Regiment Colonel John H. Ketcham
151st New York Infantry Regiment Colonel William Emerson
138th Pennsylvania Infantry Regiment Colonel Charles L.K. Sumwalt
179th Pennsylvania Infantry Regiment Colonel William H. Blair
15th New York Independent Battery to Army Potomac Artillery Reserve
2nd United States Artillery, Battery I at Fort McHenry
5th United States Artillery, Battery L
Annapolis
3rd Maryland Potomac Home Brig. Colonel Stephen W. Downey
Purnell Legion Cavalry (Md) Co. B
67th Pennsylvania Infantry Regiment Colonel John F. Staunton