United States Regiments & Batteries > Pennsylvania
The 12th Pennsylvania Volunteer Cavalry Regiment lost 2 officers and 32 enlisted men killed or mortally wounded and 1 officer and 107 enlisted men to disease during the Civil War. It is honored by a monument at Antietam.
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1861
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| December – April 1862 | Organized at Philadelphia under Colonel William Frishmuth |
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1862
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| April | Ordered to Washington, D.C. |
| April | Duty at Washington, D.C. Attached to Military District of Washington |
| April 20 | Colonel Frishmuth resigned. Lewis B. Pierce was promoted to colonel. |
| June 20 | Moved to Manassas Junction, Va., and guard Orange & Alexandria Railroad |
| August | Moved to Bristoe, thence to Alexandria, and picket north bank Potomac from Chain Bridge to Edward’s Ferry |
| September-October | Maryland Campaign. Assigned to 4th Brigade, Pleasanton’s Cavalry Division, Army Potomac |
| September 12 | Frederick, Md. |
| September 16-17 |
Battle of Antietam |
| October | Duty on line of the Baltimore & Ohio Railroad, Headquarters at Sir John!s Run and Bath. Assigned to Averill’s Cavalry Command, 8th Army Corps, Middle Department |
| November | Attached to Defenses Upper Potomac, 8th Corps |
| November 6 | To Martinsburg, W. Va. |
| November 9 | To Moorefield |
| November 24 | To Newtown |
| December 26 | To Kearneysville |
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1863
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| January 1 | Bunker Hill |
| February | Assigned to 1st Brigade, 2nd Division, 8th Corps |
| February 12 | Near Smithfield and Charlestown |
| April 8 | MillWood Road near Winchester |
| April 20 | Reconnaissance from Winchester to Wardensville and Strasburg |
| April 22-29 | Operations in Shenandoah Valley |
| April 22 | Strasburg Road, Fisher’s Hill |
| April 25-30 | Scout to Strasburg |
| June 12 | Cedarville and Winchester |
| June 13-15 | Winchester |
| June | Attached to Pierce’s Brigade, Dept. of the Susquehanna |
| June 24 | McConnellsburg, Pa. |
| July 5 | Cunningham’s Cross Roads |
| July 5 |
Greencastle, PennsylvaniaA detachment of 100 men of the regiment operating with a similar sized detachment of the 1st New York Cavalry captured 700 prisoners, two 12-pounder howitzers and 108 wagons at Cunningham Cross Roads. |
| July 10 | Near Clear Springs, Md. |
| July | Attached to McReynold’s Command, Dept. Susquehanna |
| August 3 | Moved to Sharpsburg, Md., then to Martinsburg. Attached to Martinsburg, W. Va., Dept. West Virginia |
| October 10 | Jeffersonton, Va. |
| October | Attached to 3rd Brigade, 1st Division, Dept. West Virginia |
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1864
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| February | Attached to Reserve Division, Dept. West Virginia |
| February 5 | Near Winchester |
| February 6 | Middletown |
| April 26 | Winchester |
| June 9 | Affair in Loudoun County (Detachment) |
| June 29 | Charlestown and Duffield Station |
| July 2 | Bolivar Heights |
| July | Attached to 1st Brigade, 1st Cavalry Division, West Virginia |
| July 15-16 | Near Hillsboro |
| July 17 | Charlestown |
| July 17-18 | Snicker’s Ferry |
| July 19 | Ashby’s Gap and Berry’s Ford |
| July 23 | Near Kernstown |
| July 24 | Winchester |
| July 25 | Bunker Hill and Martinsburg |
| July 28 | Cherry Run |
| July 29 | Winchester |
| August | Guard and garrison duty at Charlestown, covering railroad from Harper’s Ferry to Winchester. Attached to Reserve Division, Dept. West Virginia |
| September 27 | Charlestown |
| November 12 | Halltown and Mount Zion Church |
| November 24 | Newtown |
| November 29 | Charlestown (Detachment) |
| December 15 | Colonel Pierce was discharged. |
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1865
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| January | Attached to 3rd Infantry Division, West Virginia |
| January 1 | Lieutenant Colonel Marcus A. Reno was transferred from a staff position, promoted to colonel and given command of the Regiment. |
| February 3 | Affair at Harper’s Ferry (Detachment) |
| March 20-23 | Scout from Harper’s Ferry into Loudoun County |
| March 21 | Near Hamilton |
| March 23 | Goose Creek |
| April | Duty at Winchester and in the Shenandoah Valley attached to Cavalry, Army Shenandoah |
| July 20 | Mustered out |