The Fourth Alabama Painting by Don Troiani

Department of Pennsylvania

Army of Pennsylvania

MAJOR GENERAL R PATTERSON, Pennsylvania Volunteers
Major General R Patterson was assigned to command the Department of Pennsylvania, Philadelphia, Pennsylvania, by General Orders No.12, Paragraph III, War Department, Adjutant General's Office, Washington, D. C., on 27 April, 1861, and was discharged by General Orders No.46, Paragraph I, War Department, Adjutant General's Office, Washington, D. C., on 19 July, 1861, dated 27 July, 1861.

First Division

Brevet Major General & Brigadier General G Cadwallader, Pennsylvania Volunteers

FIRST BRIGADE
Colonel G H Thomas, Second United States Cavalry

First Rhode Island Detached Militia Infantry, Sixth, Twenty-first, & Twenty-third Pennsylvania Infantry; Doubleday's Battalion Infantry; Philadelphia City Cavalry, First Troop; Second United States Cavalry, Companies A, C, F, & K; First Rhode Island Detached Militia Artillery, Fourth United States Artillery, Light Company F

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THIRD BRIGADE
Brigadier General E C Williams, Pennsylvania Volunteers

Seventh, Eighth, Tenth, & Twentieth Pennsylvania Infantry

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FOURTH BRIGADE
Colonel D S Miles, Second United States Infantry

Ninth, Thirteenth, & Sixteenth Pennsylvania Infantry; Third United States Infantry, Companies B, D, G, H, & K; Second United States Infantry, Companies C & K

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Second Division

Major General W H Keim, Pennsylvania Volunteers

SECOND BRIGADE
Brigadier General G C Wynkoop, Pennsylvania Volunteers

First, Second, & Third Pennsylvania Infantry

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FIFTH BRIGADE
Brigadier General J S Negley, Pennsylvania Volunteers

Fourteenth, Fifteenth, & Twenty-fourth Pennsylvania Infantry; Ninth New York State Militia Infantry, Company K

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SIXTH BRIGADE
Colonel J J Abercrombie, Seventh United States Infantry

Eleventh Pennsylvania Infantry, First Wisconsin Infantry, Fourth Connecticut Infantry, Second Massachusetts Infantry

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Third Division

Major General C W Sandford, New York Volunteers

SEVENTH BRIGADE
Colonel C P Stone, Fourteenth United States Infantry

First New Hampshire Infantry, Ninth New York State Militia Infantry, Seventeenth Pennsylvania Infantry & Twenty-fifth Pennsylvania Infantry, Companies D, F, G, I, & K; Third District of Columbia Militia Battalion Infantry, Detachment

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EIGHTH BRIGADE
Acting Brigadier General & Colonel D Butterfield, Twelfth New York State Militia Infantry

Ninteenth & Twenty-eighth New York Infantry, Fifth & Twelfth New York State Militia Infantry

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UNASSIGNED

Eleventh Indiana Infantry

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