Department of Pennsylvania

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The Department of Pennsylvania was a Union Military Department constituted on April 27, 1861 to consist of Pennsylvania, Delaware, and all of Maryland not embraced in the Department of Annapolis or the Department of Washington. It was merged into the Department of the Potomac on August 24, 1861 and recreated on December 1, 1864 from the Department of the Susquehanna..

On April 27, 1861, Adjutant-General Lorenzo Thomas issued General Orders Number 12 constituting the Department of Pennsylvania. Major General Robert Patterson assumed command of the Department at Philadelphia, Pennsylvania on April 29. he was succeeded by Major General John A. Dix at Baltimore on July 25.

Statistical Information

  • Begin: April 27, 1861
  • End: August 24, 1861 (Merged into Department of the Potomac)
  • Recreated: December 1, 1864 (Changed from Department of the Susquehanna)

Roster of Units

1st Organization

COMMANDERS

Divisions Brigades Regiments or Smaller Units Dates of Service Previous Unit Next Unit
1ST DIVISION

April 27, 1861 - July 25, 1861:
George Cadwaller (Brigadier General)
July 25, 1861 - August 24, 1861:
John A. Dix (Major General)
1st Brigade

George H. Thomas (Colonel, 2nd United States Cavalry)
6th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
17th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
21st Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
(I) 23rd Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
2nd United States Cavalry June 1861 - July 1861 Garrison at Carlisle Barracks, Pennsylvania (I) Dept. of the Shenandoah / 1st Brig.
1st Rhode Island Light Artillery Battery June 1861 - July 1861 Department of Northeastern Virginia / Hunter's Division (I) Dept. of the Shenandoah / 1st Brig.
3rd Brigade

A.S. Williams (Brigadier General)
7th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
8th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
10th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
12th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
4th Brigade

April 27, 1861 - July 2, 1861:
J.C. Longenecker (Colonel, U.S. Army)
July 2, 1861 - July 5, 1861:
D.S. Miles (?)
9th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
13th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
16th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
2nd United States Regular Infantry[1] June 1861 - July 1861 From Regular Army garrison To Defences of Washington
3rd United States Regular Infantry[2] June 1861 - July 1861 From Regular Army garrison To Defences of Washington
2ND DIVISION

April 27, 1861 - July 25, 1861:
W.H. Keim (Major General)
2nd Brigade

April 27, 1861 - July 25, 1861:
George C. Wynkoop (Brigadier General)
1st Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
2nd Pennsylvania Infantry June 1861 - July 1861 From new organization (I) Dept. of the Shenandoah / 1st Brig.[3]
3rd Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
24th Pennsylvania Infantry June 1861 - July 1861 From new organization 5th Brigade (Negley)
5th Brigade

J.S. Negley (Brigadier General)
14th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
15th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
24th Pennsylvania Infantry June 1861 - July 1861 4th Brigade (Wynkoop) No change to muster out
6th Brigade

J.J. Abercrombie (Brigadier General)
(I) 11th Pennsylvania Infantry June 1861 - July 1861 From new organization No change to muster out
(I) 1st Wisconsin Infantry June 1861 - July 1861 From new organization No change to muster out
4th Connecticut Infantry June 1861 - July 1861 From new organization (I) Dept. of the Shenandoah / 2nd Brig.
2nd Massachusetts Infantry June 1861 - July 1861 From new organization (I) Dept. of the Shenandoah / 2nd Brig.
3RD DIVISION

C.P. Sanford (Major General)
7th Brigade

C.P. Stone (Colonel, U.S. Army)
1st New Hampshire Infantry July 1861 - July 1861 From Stone's Rockville Expedition (I) Dept. of the Shenandoah / 3rd Brig.
83rd New York Infantry July 1861 - July 1861 From Stone's Rockville Expedition (I) Dept. of the Shenandoah / 3rd Brig.
25th Pennsylvania Infantry July 1861 - July 1861 From Stone's Rockville Expedition No change to muster out
District of Columbia Volunteers July 1861 - July 1861 From Stone's Rockville Expedition To Defences of Washington
4th United States Artillery / Battery F July 1861 - July 1861 From Carlisle, Pennsylvania (I) Dept. of the Shenandoah / 3rd Brig.
8th Brigade

Daniel Butterfield (Colonel, 12th New York Infantry)
(I) 5th New York Infantry July 1861 - July 1861 Department of Northeastern Virginia / Washington, D.C. No change to muster out
(I) 12th New York Infantry July 1861 - July 1861 Department of Northeastern Virginia / Washington, D.C. No change to muster out
19th New York Infantry July 1861 - July 1861 Department of Northeastern Virginia / Washington, D.C. (I) Dept. of the Shenandoah / 1st Brig.
(I) 28th New York Infantry July 1861 - July 1861 Department of Northeastern Virginia / Washington, D.C. (I) Dept. of the Shenandoah / 1st Brig.
Unassigned
(I) 11th Indiana Infantry July 1961 - July 1861 From Cumberland, Maryland No change to muster out

2nd Organization

COMMANDERS

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Notes

  1. Listed in this unit on ACWR 270, but this part of the unit history does not appear on ACWR 1710.
  2. Listed in this unit on ACWR 270, but this part of the unit history does not appear on ACWR 1710.
  3. ACWR 0270 says this unit mustered out and the unit history on ACWR 1577 does not mention this unit changing. Howwever, it is listed on ACWR 0272 under (I) Dept. of the Shenandoah / 1st Brig.. For now, it has been left this way.

Sources