12th Pennsylvania (Reserve) Infantry

== Regimental History and Service Record ==
(41st Volunteers)
Organized at Harrisburg August, 1861. At Camp Curtin until August 10. Moved to Washington, D.C.; thence to Tennallytown, Md., August 10-13. Attached to 3rd Brigade, McCall's Pennsylvania Reserves Division, Army of the Potomac, to March, 1862. 3rd Brigade, 2nd Division, 1st Army Corps, Army of the Potomac, to April, 1862. 3rd Brigade, McCall's Division, Dept. of the Rappahannock, to June, 1862. 3rd Brigade, 3rd Division, 5th Army Corps, Army of the Potomac, to August, 1862. 3rd Brigade, 3rd Division, 3rd Corps, Army of Virginia, to September, 1862. 3rd Brigade, 3rd Division, 1st Army Corps, Army of the Potomac, to February, 1863. 3rd Brigade, Pennsylvania Reserves Division, 22nd Corps, Dept. of Washington, to June, 1863. 3rd Brigade, 3rd Division, 5th Army Corps, Army of the Potomac, to June, 1864.
SERVICE.--Duty at Tennallytown, Md., August 13 to October 10, 1861, and at Camp Pierpont, near Langley, Va., to March, 1862. Expedition to Grinnell's Farm December 6, 1861. Action at Dranesville December 20, 1861. Advance on Manassas, Va., March 10-15, 1862. McDowell's advance on Falmouth April 9-19. Duty at Fredericksburg until June. Moved to White House June 9-12. 
* 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. Battles of Gainesville August 28; Groveton August 30; 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 30. Movement to Falmouth, Va., October 30-November 19. Bat- tle of Fredericksburg, Va., December 12-15. "Mud March" January 20-24, 1863. Ordered to Washington, D.C., February 6, and duty there and at Alexandria until June 25. Ordered to rejoin Army of the Potomac in the field. 
* June 11-August 1, 1863 - The Gettysburg CampaignNot originally referenced on unit homepage
** July 1-3, 1863 - Battle of Gettysburg, Pennsylvania
Pursuit of Lee July 5-24. Duty on the Rapidan until October. Bristoe Campaign October 9-22. Advance to line of the Rappahannock November 7-8. Rappahannock Station November 7. Mine Run Campaign November 26-December 2. Guard Orange & Alexander Railroad until April, 1864. 
* May 4-June 12, 1864 - The Overland Campaign
** May 5-7, 1864 - Battle of the Wilderness, Virginia
** May 8-21, 1864 - Battles of Spotsylvania Court House, Virginia
*** May 8, 1864 - Combat at Laurel Hill, Virginia
*** May 12, 1864 - Assault on the Salient at Spotsylvania Court House, Virginia
*** May 19, 1864 - Engagement at Harris Farm, Virginia
** May 22-26, 1864 - Operations on Line of the North Anna River, Virginia
*** May 25, 1864 - Engagement at Jericho Ford, Virginia
** May 26-28, 1864 - Operations on Line of the Pamunkey River, Virginia
** May 28-31, 1864 - Operations on Line of the Totopotomoy River, Virginia
* May 31, 1864 - Veterans and recruits re-organized into the 190th Pennsylvania Infantry
* Non-veterans left front 
** June 11, 1864 - Mustered out of federal service
== Regimental Roster ==
== Regiment Statistical Information ==
* Regiment lost during service 1 Officer and 110 Enlisted men killed and mortally wounded and 1 Officer and 69 Enlisted men by disease. Total 181.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 761, 827, 902, 903, 904, 932, 933, 934, 936, 937, 938, 939, 940, 1582-1583)
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