Department of the Shenandoah

The Department of the Shenandoah was a Union Military Department constituted on July 19, 1861 to consist of the Valley of Virginia, the counties of Washington and Allegany in Maryland, and such parts of Virginia as may be covered by the army in its operations. In Frederick Dyer's Compendium of the War of the Rebellion, this army is often referred to as "Banks' Division" rather than the army itself, possibly in anticipation of expanding the department. It was discontinued on August 17, 1861 and merged into the Department of the Potomac. It was recreated on April 4, 1862 and merged into the Army of Virginia on June 26, 1862.
== Statistical Information ==
* Begin: July 19, 1861
* End: August 17, 1861 (Merged into Department of the Potomac)
* Recreated: April 4, 1862
* End: June 26, 1862 (Merged into the Army of Virginia)
== Roster of Units ==
=== 1st Organization ("Banks' Division") ===
COMMANDERS
* July 25, 1861 - August 17, 1861: Nathaniel P. Banks (Major General)
Brigades 	Regiments or Smaller Units 	Dates of Service 	Previous Unit 	Next Unit
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	 	 	 	
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	19th New York Infantry 	July 1861 - August 1861	Dept. Pennsylvania / 3rd Div. / 8th Brig. 	(I) Dept. Potomac / 1st Div. / 1st Brig.
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	(I) 28th New York Infantry 	July 1861 - August 1861	Dept. Pennsylvania / 3rd Div. / 8th Brig. 	(I) Dept. Potomac / 1st Div. / 1st Brig.
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	2nd Pennsylvania Infantry 	July 1861 - August 1861	Dept. Pennsylvania / 1st Div. / 2nd Brig. 	No change to muster out
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	28th Pennsylvania Infantry 	July 1861 - August 1861	From new organization 	(I) Dept. Potomac / 1st Div. / 1st Brig.
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	5th Connecticut Infantry 	July 1861 - August 1861	From new organization 	(I) Dept. Potomac / 1st Div. / 1st Brig.
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	1st Rhode Island Light Artillery Battery	July 1861 - August 1861	Dept. Pennsylvania / 1st Div. / 1st Brig. 	No change to muster out
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	2nd United States Cavalry 	July 1861 - August 1861	Dept. Pennsylvania / 1st Div. / 1st Brig. 	No change to muster out
1st BrigadeGeorge H. Thomas (Colonel, 2nd United States Cavalry) 	Philadelphia City Troop 	July 1861 - August 1861	From new organizationACWR 0272 says this unit came from Dept. Pennsylvania / 1st Div. / 1st Brig., but it is not shown on ACWR 0270 nor ACWR 1570 under the unit history. For now it has been left this way. 	No change to muster out
2nd BrigadeJ.J. Abercrombie (Colonel, U.S. Army) 	 	 	 	
2nd BrigadeJ.J. Abercrombie (Colonel, U.S. Army) 	2nd Massachusetts Infantry 	July 1861 - August 1861	Dept. Pennsylvania / 2nd Div. / 6th Brig. 	Banks Division / Abercrombie's Brigade
2nd BrigadeJ.J. Abercrombie (Colonel, U.S. Army) 	12th Massachusetts Infantry 	July 1861 - August 1861	From new organization 	(I) Dept. Potomac / 1st Div. / 2nd Brig.
2nd BrigadeJ.J. Abercrombie (Colonel, U.S. Army) 	(I) 12th Indiana Infantry 	July 1861 - August 1861	From new organization 	(I) Dept. Potomac / 1st Div. / 2nd Brig.
2nd BrigadeJ.J. Abercrombie (Colonel, U.S. Army) 	(I) 16th Indiana Infantry 	July 1861 - August 1861	From new organization 	(I) Dept. Potomac / 1st Div. / 2nd Brig.
2nd BrigadeJ.J. Abercrombie (Colonel, U.S. Army) 	4th Connecticut Infantry 	July 1861 - August 1861	Dept. Pennsylvania / 2nd Div. / 6th Brig. 	(I) Dept. Potomac / 1st Div. / 2nd Brig.
2nd BrigadeJ.J. Abercrombie (Colonel, U.S. Army) 	1st United States Artillery / Battery E 	July 1861 - August 1861	From Regular Army garrisonACWR 0272 says this unit came from Dept. of Pennsylvania / Unassigned Units, but it is not shown on ACWR 0270 nor ACWR 1694 under the unit history. For now it has been left this way.	Defences of Washington
3rd BrigadeACWR 0272 lists these dates as 1862. This must be a transcription error.July 25, 1861 - August 8, 1861:C.P. Stone (Colonel, U.S. Army)August 8, 1861 - August 17, 1861:J.W. Stiles (Colonel, 83rd New York Infantry)	 	 	 	
3rd BrigadeACWR 0272 lists these dates as 1862. This must be a transcription error.July 25, 1861 - August 8, 1861:C.P. Stone (Colonel, U.S. Army)August 8, 1861 - August 17, 1861:J.W. Stiles (Colonel, 83rd New York Infantry)	1st New Hampshire Infantry 	July 1861 - August 1861	Dept. Pennsylvania / 3rd Div. / 7th Brig. 	No change to muster out
3rd BrigadeACWR 0272 lists these dates as 1862. This must be a transcription error.July 25, 1861 - August 8, 1861:C.P. Stone (Colonel, U.S. Army)August 8, 1861 - August 17, 1861:J.W. Stiles (Colonel, 83rd New York Infantry)	83rd New York Infantry 	July 1861 - August 1861	Dept. Pennsylvania / 3rd Div. / 7th Brig. 	(I) Dept. Potomac / 1st Div. / 3rd Brig.
3rd BrigadeACWR 0272 lists these dates as 1862. This must be a transcription error.July 25, 1861 - August 8, 1861:C.P. Stone (Colonel, U.S. Army)August 8, 1861 - August 17, 1861:J.W. Stiles (Colonel, 83rd New York Infantry)	3rd Wisconsin Infantry 	July 1861 - August 1861	From new organization 	(I) Dept. Potomac / 1st Div. / 3rd Brig.
3rd BrigadeACWR 0272 lists these dates as 1862. This must be a transcription error.July 25, 1861 - August 8, 1861:C.P. Stone (Colonel, U.S. Army)August 8, 1861 - August 17, 1861:J.W. Stiles (Colonel, 83rd New York Infantry)	4th United States Artillery / Battery F 	July 1861 - August 1861	Dept. Pennsylvania / 3rd Div. / 7th Brig. 	(I) Dept. Potomac / 1st Div. / 3rd Brig.
=== 2nd Organization ===
COMMANDERS
* April 4, 1862 - June 26, 1862: Nathaniel P. Banks (Major General)
== Notes ==
== Sources ==
* (Page 272)
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