12th United States Infantry

== Regimental History and Service Record ==
Organized by direction of the President May 4, 1861, and confirmed by Act of Congress July 29, 1861. Organized at Fort Hamilton, N.Y. Harbor. Moved to Washington, D.C., March 5, 1862. Attached to Sykes' Regular Infantry, Reserve Brigade, Army Potomac, to May, 1862. 1st Brigade, 2nd Division, 5th Army Corps, to August, 1863. Dept. of the East to September, 1863. 1st Brigade, 2nd Division, 5th Army Corps, to March, 1864. 4th Brigade, 1st Division, 5th Army Corps, to April, 1864. 1st Brigade, 1st Division, 5th Army Corps, to June, 1864. 1st Brigade, 2nd Division, 5th Army Corps, to November, 1864. Dept. of the East to July, 1865.
SERVICE.--
* Moved to the Virginia Peninsula March, 1862. 
* March 17-September 2, 1862 - The Peninsula Campaign 
** April 5-May 4, 1862 - Siege of Yorktown, Virginia
** 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 Turkey Bridge, Virginia
*** July 1, 1862 - Engagement at Malvern Hill, Virginia
At Harrison's Landing until August 16. Movement to Fortress Monroe, thence to Centerville August 16-28. Pope's Campaign in Northern Virginia August 28-September 2. Battles of Groveton August 29; Bull Run August 30.
* September 3-20, 1862 - The Maryland Campaign
** September 17, 1862 - Battle of Antietam, Maryland
** September 19, 1862 - Actions at Sharpsburg and Shepherdstown/Blackford's/Boteler's Fords, Maryland
* At Sharpsburg, Md., until October 29.
* Kearneysville and Shepherdstown October 16-17.
* October 16-17, 1862 - Reconnoissance from Sharpsburg, Maryland to Smithfield, West VirginiaNot originally listed on unit homepage but referenced on Dyer summary
* Movement to Falmouth, Va., October 29-November 19.
* Battle of Fredericksburg, Va., December 12-15.
* "Mud March" January 20-24, 1863. 
* April 27-May 6, 1863 - The Chancellorsville Campaign
** May 1-5, 1863 - Battle of Chancellorsville, Virginia
* June 11-August 1, 1863 - The Gettysburg Campaign
** July 1-3, 1863 - Battle of Gettysburg, Pennsylvania
Pursuit of Lee July 5-24. Moved to New York August 16-19. (Cos. "F" and "H," 2nd Battalion, in N.Y. riots July, 1863.) Duty at New York until September 14. Rejoined army at Culpeper, Va., September 22. Bristoe Campaign October 9-22. Advance to line of the Rappahannock November 7-8. Mine Run Campaign November 26-December 2.
* Rapidan Campaign
** May 5-7, 1864 - Battle of the Wilderness, Virginia
** May 8-21, 1864 - Battles of Spotsylvania Court House, Virginia (Companies A/B/C/D/G [1st Battalion], and Companies A/C/D/F/H [2nd Battalion])According to Wikipedia
** May 22-26, 1864 - Operations on Line of the North Anna River, 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
** June 1-12, 1864 - Battles of Cold Harbor, Virginia - 1st Battalion (Companies A/B/C/D/G) and 2nd Battalion (Companies A/C/D/F/H)
*** June 1-3, 1864 - Battle of Bethesda Church, Virginia
Before Petersburg June 16-18. Siege of Petersburg June 16 to November 2. Mine Explosion, Petersburg, July 30 (Reserve). Weldon Railroad August 18-21. Poplar Springs Church, Peeble's Farm, September 29-October 2. Boydton Plank Road, Hatcher's Run, October 27-28. Moved to New York November 2-6. 1st Battalion on duty at Elmira, N.Y., and 2nd Battalion at Fort Hamilton. N.Y. Harbor, until July, 1865.
== Regimental Roster ==
== Regiment Statistical Information ==
* Regiment lost during service 8 Officers and 118 Enlisted men killed and mortally wounded and 3 Officers and 190 Enlisted men by disease. Total 319.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 758, 759, 761, 828, 897, 902, 903, 904, 905, 916, 932, 933, 934, 938, 939, 940, 941, 1713)
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