United States Regiments & Batteries > Pennsylvania
“Roundheads”
The 100th Pennsylvania Volunteer Infantry Regiment lost 16 officers and 208 enlisted men killed or mortally wounded and 2 officers and 183 enlisted men to disease during the Civil War. The regiment is honored by a monument on the Antietam battlefield.
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1861
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| August 31 | Organized at Pittsburg. Recruited in Lawrence, Washington, Butler, Beaver, Mercer and Westmoreland Counties. |
| September 2 | Left State for Washington, D.C. Attached to Casey’s Provisional Division |
| October 9 | Moved to Annapolis, Md. Attached to Stevens’ 2nd Brigade, Sherman’s South Carolina Expedition. Captain David Leckey of Company M was promoted to major. |
| October 21-November 7 | Sherman’s Expedition to Port Royal Harbor, South Carolina, attached to 2nd Brigade, 2nd Division, Dept. of the South |
| November 7 | Capture of Forts Walker and Beauregard, Port Royal Harbor |
| December 8 | Occupation of Beaufort, S.C. |
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1862
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| January 1 | Port Royal Ferry, Coosa River | |
| June 1-28 | Operations on James Island, S.C. | |
| June 3 | Legaire’s Point, James Island | |
| June 3-4 | Skirmishes on James Island | |
| June 16 | Battle of Secessionville, James Island | |
| June 28-July 7 | Evacuation of James Island and movement to Hilton Head, S.C. | |
| July 12-17 | Moved to Newport News, Va. and attached to 2nd Brigade, 1st Division, 9th Army Corps, Army Potomac. Mejor Leckey was promoted to lieutenant colonel. | |
| August 4-6 | To Fredericksburg | |
| August 6-16 | Operations in support of Pope | |
| August 16-September 2 | Pope’s Campaign in Northern Virginia | |
| August 29 |
Battle of Groveton |
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| August 30 |
Second Battle of Bull Run |
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| September 1 |
Battle of Chantilly |
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| September 6-24 | Maryland Campaign Attached to 3rd Brigade, 1st Division, 9th Army Corps | |
| September 14 |
Battle of South MountainThe regiment lost 9 men killed and 25 wounded. |
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| September 16-17 |
Battle of AntietamThe 100th Pennsylvania was comanded at the Battle of Antietam by Lieutenant Colonel David A. Leckey. Assigned as skirmishers for the brigade, it suffered 7 enlisted men wounded and one man missing in its advance from Antietam Creek to the edge of Sharpsburg. From the War Department tablet for Welsh’s Brigade on the Antietam battlefield: On the morning of the 17th Welsh’s Brigade was in reserve on the eastern slope of the ridge on the left bank of the Antietam, nearly opposite the Burnside Bridge. About 2 P.M., after Sturgis’ Division had carried the bridge, the Brigade crossed and, following the road to Sharpsburg about 250 yards, formed line west of the road. The Brigade then advanced over the high ground west of the road, gradually crossing to the east, until its right was near this point, its center in the ravine and at the stone mill, and its left in the apple orchard beyond, when the attack of A.P. Hill on the left flank of the Corps compelled it to withdraw to the banks of the Antietam, where it remained until the evening of the 18th. |
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| October 11-November 18 | March up the Potomac to Leesburg, then to Falmouth | |
| December 12-15 |
Battle of Fredericksburg |
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| December 30 |
Lieutenant Colonel Leckey resigned. |
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1863
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| January 20-24 | Burnside’s 2nd Campaign, “Mud March” |
| February 13 | Moved to Newport News, Va. |
| March 20-28 | To Covington, Ky. |
| April | Duty in District of Kentucky at Paris, Nicholasville, Lancaster, Stanford and Somerset attached to 3rd Brigade, 1st Division, 9th Army Corps, Dept. Ohio |
| June 4-10 | Movement through Kentucky to Cairo, Ill. |
| June 14-17 | To Vicksburg, Miss. |
| June 17-July 4 | Siege of Vicksburg Attached to Army of the Tennessee |
| July 5-10 | Advance on Jackson, Miss. |
| July 10-17 | Siege of Jackson |
| July | Duty at Milldale |
| August 6 | Moved to Covington, Ky. and attached to the Army of the Ohio |
| August 6-18 | To Crab Orchard, Ky., |
| September 10-26 | March to Knoxville, Tenn. |
| October 10 | Action at Blue Springs |
| November 4-December 23 | Knoxville Campaign |
| November 16 | Campbell Station |
| November 17-December 4 | Siege of Knoxville |
| November 29 | Repulse of Longstreet’s assault on Fort Saunders |
| December 5-24 | Pursuit of Longstreet |
| December 25 | At Blain’s Cross Roads |
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1864
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| January | Veterans marched over Cumberland Mountains to Nicholasville, Ky. and on furlough until March. |
| April | Ordered to Annapolis, Md., and duty there attached to 2nd Brigade, 1st Division, 9th Army Corps, Army Potomac |
| May 4-June 12 | Rapidan Campaign. Attached to 1st Brigade, 1st Division, 9th Army Corps |
| May 5-7 |
Battle of the Wilderness |
| May 8-21 |
Battle of Spotsylvania Court House |
| May 10 | Ny River |
| May 12 | Assault on the Salient |
| May 12-21 | North Anna River |
| May 24 | Ox Ford |
| May 26-28 | Line of the Pamunkey |
| May 28-31 | Totopotomoy |
| June 1-12 |
Cold Harbor |
| June 1-3 | Bethesda Church |
| June 16-18 | First Assault on Petersburg |
| June 16, 1864 -April 2, 1865 | Siege of Petersburg |
| July 30 | Mine Explosion, Petersburg |
| August 18-21 | Weldon Railroad |
| September | Attached to 3rd Brigade, 1st Division, 9th Army Corps |
| September 29-October 2 | Poplar Springs Church |
| November 8 | Reconnaissance on Vaughan and Squirrel Level Road |
| October 27-28 | Boydton Plank Road, Hatcher’s Run |
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1865
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| March 25 | Fort Stedman |
| March 28-April 9 | Appomattox Campaign |
| April 2 | Final assault on Petersburg |
| April 3 | Occupation of Petersburg |
| April 3-8 | Pursuit of Lee |
| April 21-28 | Moved to Washington, D. C |
| May 23 | Grand Review |
| July 24 | Mustered out |