United States Regiments & Batteries > U.S. Regulars
The 12th United States Infantry Regiment lost 8 officers and 118 enlisted men killed and mortally wounded and 3 officers and 190 enlisted men to disease during the Civil War. It is referenced on War Department markers at Antietam and honored by a monument at Gettysburg.
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1861
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| May 4 | Organized by direction of the President |
| July 29 | Confirmed by Act of Congress |
| Organized at Fort Hamilton, N.Y. Harbor | |
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1862
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| March 5 | Moved to Washington, D.C. Attached to Sykes’ Regular Infantry, Reserve Brigade, Army Potomac |
| March | Moved to the Virginia Peninsula |
| April 5-May 4 | Siege of Yorktown |
| May | Attached to 1st Brigade, 2nd Division, 5th Army Corps |
| June 25-July 1 | Seven days before Richmond |
| June 26 | Battle of Mechanicsville |
| June 27 | Gaines’ Mill |
| June 30 | Turkey Bridge |
| July 1 |
Malvern HillCaptain Matthew M. Blunt (USMA 1853) was breveted Major for gallantry. |
| July-August | At Harrison’s Landing |
| August 16-28 | Movement to Fortress Monroe, then to Centerville |
| August 28-September 2 | Pope’s Campaign in Northern Virginia |
| August 29 | Battle of Groveton |
| August 30 |
Second Battle of Bull Run |
| September 6-22 | Maryland Campaign |
| September 16-17 |
Battle of AntietamThe regiment was commanded by Captain Matthew M. Blunt. The 1st Battalion lost 1 man killed and 3 wounded, while the 2nd Battalion had no casualties. From the marker on the Antietam battlefield: At sunset September 16, 1862, the First Battalion, Twelfth Infantry relieved the Fourth Infantry, guarding the Middle Bridge over the Antietam and remained on that duty until after noon of the 17th, when it advanced in support of the Horse Batteries posted on the crest of the ridge crossing the road a few feet west of this point. Winthrop’s Company (G) was deployed in skirmishing down the road and in the fields south of it to drive the Confederate Sharpshooters, who were annoying the gunners, and continued on this dutv until late in the day, when it was relieved by the Fourth Infantry, the Second and Tenth Infantry and the Second Battalion of the Fourteenth Infantry. |
| September 19-20 |
Shepherdstown Ford |
| September 21 | At Sharpsburg, Md. |
| October 16-17 | Kearneysville and Shepherdstown |
| October 29-November 19 | Movement to Falmouth, Va. |
| December 12-15 |
Battle of FredericksburgCaptain Matthew M. Blunt was breveted Lieutenant Colonel for gallantry. |
| January 20-24 | “Mud March” |
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1863
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| April 27-May 6 | Chancellorsville Campaign |
| May 1-5 |
Battle of ChancellorsvilleCaptain Thomas M. Anderson was wounded. |
| June 11-July 24 | Gettysburg Campaign |
| July 1-3 |
Battle of GettysburgCommanded by Captain Thomas S. Dunn, the regiment brought eight companies to the field. From the monument on Houck’s Ridge at Gettysburg: July 2. Arrived in the morning and took position with the Brigade and Division near the Twelfth Corps on the right. Moved with the Division from the right to the left of the line and at 5 p.m. with the Brigade moved across Plum Run near Little Round Top and supported the Second Brigade in its advance to the crest of the rocky wooded hill in front and facing left engaged the Confederates but returned under a heavy fire on both flanks and from the rear after the Confederates had gained possession of the Wheatfield in the rear of the Brigade and went into position on Little Round Top. July 3. Remained in the same position July 4. Regiment with the 14th supported the 3d 4th and 6th U.S. Infantry in a reconnaissance and developed a force of the Confederate Infantry and Artillery in front. Casualties: killed 1 officer and 7 men, wounded 4 officers and 67 men, missing 13 men. |
| July 5-24 | Pursuit of Lee |
| July | Companies F and H, 2nd Battalion, in N.Y. riots |
| August 16-19 | Moved to New York |
| August 19 | Duty at New York attached to Dept. of the East |
| September 14 | Left New York for front |
| September 22 | Rejoined army at Culpeper, Va. and attached to 1st Brigade, 2nd Division, 5th Army Corps |
| October 9-22 |
Bristoe Campaign |
| November 7-8 | Advance to line of the Rappahannock |
| November 26-December 2 |
Mine Run Campaign |
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1864
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| March | Attached to 4th Brigade, 1st Division, 5th Army Corps |
| April | Attached to 1st Brigade, 1st Division, 5th Army Corps |
| May 5-7 |
Battle of the Wilderness |
| May 8-21 |
Spotsylvania Court House |
| May 22-26 | North Anna River |
| May 26-28 | On line of the Pamunkey |
| May 28-31 | Totopotomoy |
| June 1-12 |
Cold Harbor |
| June 1-3 | Bethesda Church |
| June | Attached to 1st Brigade, 2nd Division, 5th Army Corps |
| June 16-18 | First Assault on Petersburg |
| June 16 to November 2 | Siege of Petersburg |
| July 30 | Mine Explosion, Petersburg (Reserve) |
| August 18-21 | Weldon Railroad |
| September 29-October 2 | Poplar Springs Church, Peeble’s Farm |
| October 27-28 | Boydton Plank Road, Hatcher’s Run |
| November 2-6 | Moved to New York |
| November 1864-
July 1865 |
Attached to the Dept. of the East
1st Battalion on duty at Elmira, N.Y. 2nd Battalion at Fort Hamilton. N.Y. Harbor |