4th Pennsylvania (Reserve) Infantry

== Regimental History and Service Record ==
(33rd Volunteers)
Organized at Harrisburg July 17, 1861. Moved to Washington, D.C., thence to Tennallytown, Md. Attached to 2nd Brigade, McCall's Pennsylvania Reserves Division, Army of the Potomac, to March, 1862. 2nd Brigade, 2nd Division, 1st Army Corps, Army of the Potomac, to April, 1862. 2nd Brigade, McCall's Division, Dept. of the Rappahannock, to June, 1862. 2nd Brigade, 3rd Division, 5th Army Corps, Army of the Potomac, to August, 1862. 2nd Brigade, 3rd Division, 3rd Corps, Army of Virginia, to September, 1862. 2nd Brigade, 3rd Division, 1st Army Corps, Army of the Potomac, to February, 1863. 2nd Brigade, Pennsylvania Reserves Division, 22nd Corps, Dept. of Washington, to January, 1864. Dept. of West Virginia to April, 1864. 3rd Brigade, 2nd Infantry Division, Dept. of West Virginia, to June, 1864.
SERVICE.--Duty at Tennallytown, Md., until October 10, and at Camp Pierpont, near Langley, Va., until March, 1862. Expedition to Grinnell's Farm December 6, 1861. Advance on Manassas, Va., March 10-15, 1862. McDowell's advance on Falmouth, Va., April 9-19. Duty at Fredericksburg until June. Moved to White House June 9-11. 
* June ?-September 2, 1862 - The Peninsula Campaign
** June 25-July 1, 1862 - The Seven Days Battles before Richmond, Virginia
*** June 26, 1862 - Engagement at Beaver Dam Creek, Virginia
*** June 27, 1862 - Engagement at Gaines's Mill, Virginia
*** June 30, 1862 - Engagement at Glendale, Virginia
*** July 1, 1862 - Engagement at Malvern Hill, Virginia
* At Harrison's Landing until August 16. 
* Movement to Join Pope August 16-26. 
* August 16-September 2, 1862 - The Northern Virginia CampaignNot originally referenced on unit homepage, joined campaign day or two before Gainesville
** August 28, 1862 - Engagement at Gainesville, Virginia 
Groveton August 29. Bull Run August 30. 
* September 3-20, 1862 - The Maryland Campaign
** September 14, 1862 - Battle of South Mountain, Maryland
** September 17, 1862 - Battle of Antietam, Maryland
Duty in Maryland until October. Movement to Falmouth, Va., October 30-November 19, Battle of Fredericksburg December 12-15. "Mud March" January 20-24, 1863. Ordered to Washington, D.C., February 6, and duty there and in the District of Alexandria until January 6. 1864. Duty near Martinsburg, W. Va., until January 27. Operations in Hampshire and Hardy counties January 27-February 7. Duty near Kearneysville until March 27. Moved to Webster, thence to the Kanawha Valley April 22. Crook's Expedition to Virginia & Tennessee Railroad May 2-19. Battle of Cloyd's Mountain May 9. New River Bridge May 10. Expedition to Meadow Bluff May 10-19. Near Newport May 12-13. Left front for Philadelphia via Pittsburg, Pa., June 4. Mustered out June 17, 1864. Veterans and Recruits transferred to 54th Pennsylvania Infantry June 8, 1864.
== Regimental Roster ==
== Regiment Statistical Information ==
* Regiment lost during service 2 Officers and 76 Enlisted men killed and mortally wounded and 1 Officer and 60 Enlisted men by disease. Total 139.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 760, 761, 906, 907, 1578-1579)
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