October 1861to November >

Provost Guard Colonel Andrew Porter
Sturgis (Illinois) Rifles from Headquarters, Div. Potomac
2nd United States Infantry Regiment from Defences of Washington
3rd United States Infantry, Cos.BDGH&K from Defences of Washington
4th United States Infantry Regiment from Defences of Washington
6th United States Infantry Regiment from Defences of Washington
8th United States Infantry, Cos. F&G from Defences of Washington
4th United States Cavalry, Cos. A&E from Defences of Washington
5th United States Artillery, Battery K new
Engineer Brigade
15th New York Engineer Regiment from 15th New York Infantry Regiment
50th New York Engineer Regiment from Porter’s Div., 3rd Bde.
Regular Engineer Battalion