United States Regiments & Batteries > Pennsylvania
The 121st Pennsyvania Infantry Regiment lost 5 officers and 104 enlisted men killed or mortally wounded and 2 officers and 64 enlisted men to disease during the Civil War. It is honored by two monuments at Gettysburg.
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1861
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| August 22 – September 5 | Organized at Philadelphia |
| September | Moved to Washington, D.C. Camp at Arlington Heights, near Washington |
| October 1 | Moved to Frederick, Md., and join Army of the Potomac. Attached to 1st Brigade. 3rd Division, 1st Corps. |
| October | Duty at Sharpsburg, Md. |
| October 30-November 19 | Movement to Falmouth, Va. |
| December 12-15 |
Battle of Fredericksburg |
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1863
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| January 20-24 | Burnside’s 2nd Campaign, “Mud March” |
| February-April | Duty at Belle Plains |
| April 27-May 6 | Chancellorsville Campaign |
| April 29-30 | Fitzhugh’s Crossing |
| May 2-5 |
Battle of Chancellorsville |
| June 11-July 24 | Gettysburg Campaign |
| July 1-3 |
Battle of GettysburgThe regiment was commanded at Gettysburg by Major Alexander Biddle while his cousin, Colonel Chapman Biddle, held temporary brigade command. Colonel Biddle resumed command of the regiment during the battle despite being slightly wounded on July 1. From the monument on Seminary Ridge at Gettysburg: Occupied this position, the extreme left of the Union line. July 2d & 3d on Cemetery Ridge. Present at Gettysburg 11 officers and 286 men. Killed died of wounds 20 men. Wounded 5 officers and 33 men. Captured and missing 1 officer and 60 men. From the monument on Cemetery Ridge at Gettysburg: Whole number engaged 7 officers 258 enlisted men. Casualties Killed 12 enlisted men. |
| July 5-24 | Pursuit of Lee |
| August-October | Duty on line of the Rappahannock |
| October 9-22 | Bristoe Campaign |
| November 7-8 | Advance to line of the Rappahannock |
| November 26-December 2 | Mine Run Campaign |
| November 30 | Licking River Bridge |
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1864
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| February 6-7 | Demonstration on the Rapidan |
| February-April | Duty near Culpeper |
| March | Attached to 3rd Brigade, 4th Division, 5th Army Corps |
| May 4-June 12 | Rapidan Campaign |
| May 5-7 |
Battle of the Wilderness |
| May 8-21 |
Spottsylvania Court House |
| May 8 | Laurel Hill |
| May 12 | Assault on the Salient |
| May 23-26 | North Anna River |
| May 25 | Jericho Ford |
| May 26-28 | On line of the Pamunkey |
| May 28-31 | Totopotomoy |
| June 1-12 | Cold Harbor |
| June 1-3 | Bethesda Church |
| June 16-18 | Before Petersburg. Start of Siege of Petersburg attached to 1st Brigade, 1st Division. 5th Army Corps |
| July 30 | Mine Explosion, Petersburg (Reserve) |
| August 18-21 | Weldon Railroad |
| September | Attached to 3rd Brigade, 3rd Division, 5th Army Corps |
| September 29-October 2 | Poplar Springs Church, Peeble’s Farm |
| October 27-28 | Boydton Plank Road, Hatcher’s Run |
| December 7-12 | Warren’s Raid on Weldon Railroad |
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1865
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| February 5-7 | Dabney’s Mills, Hatcher’s Run |
| March 28-April 9 | Appomattox Campaign |
| March 29 | Lewis Farm, near Gravelly Run |
| March 30-31 | White Oak Road |
| April 1 | Five Forks |
| April 9 |
Appomattox Court HouseSurrender of Lee and his army. |
| May 1-12 | March to Washington, D.C. |
| May 23 | Grand Review |
| June 2 | Mustered out |