Department of Pennsylvania (discontinued 7/25)

Major General Robert Patterson

Consolidated with the Department of Northeastern Virginia on July 25, 1861 to form the Department of the Potomac.
General Order #46 honorably discharged Generals Patterson and Cadwallader at the end of their terms of service on July 27th.

1st Division

Bde. General George Cadwallader

First Brigade

Col. George H. Thomas

dissolved 7/25, regiments mustered out

Brig. Gen. A. S. Williams

dissolved 7/22, regiments mustered out

Col. J. C. Longenecker
Col. Dixon S. Miles (after 7/2)

dissolved 7/21, regiments mustered out

Major General William H. Keim

Second Brigade

Bde. Gen. G. C. Wynkoop

dissolved 7/23, regiments mustered out

Bde. Gen. J. S. Negley

dissolved 7/21, regiments mustered out

Col. J. J. Abercrombie

Major General C. P. Sandford

Seventh Brigade

Col. C. P. Stone

Col. Schwartzwalder
Col. D. Butterfield

dissolved 7/25, regiments mustered out

Colonel Lew Wallace

from Cumberland, Md. 7/8
to Indianapolis for muster out 7/29