(II) 12th New York Infantry

== Regimental History and Service Record ==
* "Onondaga Regiment" 
* "Independence Guard"
Organized at Elmira, N. Y, and mustered in for two years' State service May 8, 1861. Mustered in for three months' United States service May 13, and remustered for full term of State service August 2, 1861. Moved to Washington, D.C., May 29, 1861. Attached to Richardson's Brigade, Tyler's Division, McDowell's Army of Northeast Virginia, June to August, 1861. Richardson's Brigade, Division of the Potomac, to October, 1861. Wadsworth's Brigade, McDowell's Division, Army of the Potomac, to March, 1862. Butterfield's 3rd Brigade, Porter's 1st Division, 3rd Army Corps, Army of the Potomac, to May, 1862. 3rd Brigade, 1st Division, 5th Army Corps, to May, 1863. Headquarters, 5th Army Corps, to June, 1864.
SERVICE.--
* Duty in the Defenses of Washington, D. C., until July 16, 1861. 
* July 16-21, 1861 - The Manassas Campaign
** July 18, 1861 - Skirmish at Blackburn's/McLean's/Mitchell's Fords, VirginiaNot originally referenced on unit homepage
** July 21, 1861 - Battle of Bull Run, Virginia
Upton's Hill August 27. Duty in the Defenses of Washington, D. C, until March 10, 1862. Advance on Manassas, Va., March 10. 
* Moved to the Virginia Peninsula March 22-24. 
* March 24-September 2, 1862 - The Peninsula Campaign 
** Warwick Road April 5. 
** April 5-May 4, 1862 - Siege of Yorktown, Virginia
*** Before Yorktown April 11. 
** Reconnaissance up the Pamunkey May 10. 
** May 26, 1862 - Reconnaissance toward Hanover Court House, Virginia 
** May 27-29, 1862 - Operations about Hanover Court House, Virginia 
*** May 27, 1862 - Engagement at Hanover Court House, Virginia 
** June 25-July 1, 1862 - The Seven Days Battles before Richmond, Virginia
*** June 27, 1862 - Engagement at Gaines's Mill, Virginia
*** June 30, 1862 - Engagement at White Oak Swamp, Virginia
*** June 30, 1862 - Engagement at Turkey Bridge, Virginia
*** July 1, 1862 - Engagement at Malvern Hill, Virginia
Duty at Harrison's Landing until August 16. Movement to Fortress Monroe, thence to Centreville August 16-28. Pope's Campaign in Northern Virginia August 28-September 2. Battle of 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 30. Movement to Falmouth, Va., October 30-November 19. Battle of Fredericksburg, Va., December 12-15. Expedition to Richard's and Ellis' Fords December 29-30. "Mud March" January 20-24, 1863. At Falmouth until April. 
* April 27-May 6, 1863 - The Chancellorsville Campaign
** May 1-5, 1863 - Battle of Chancellorsville, Virginia
* Mustered out May 17, 1863, expiration of term. 
Three years men consolidated to a Battalion of two Companies and assigned to duty as Provost Guard at Headquarters, 5th Army Corps, to June, 1864. Participating in the Gettysburg (Pa.) Campaign June 11-July 24, 1863. Battle of Gettysburg July 1-3. Bristoe Campaign October 9-22. Advance to line of the Rappahannock November 7-8. Mine Run Campaign November 26-December 2.
* May 4-June 12, 1864 - The Overland Campaign
** May 5-7, 1864 - Battle of the Wilderness, Virginia
** May 8-21, 1864 - Battles of Spotsylvania Court House, Virginia
*** May 8, 1864 - Combat at Laurel Hill, VirginiaNot originally listed on unit homepage
*** May 12, 1864 - Assault on the Salient at Spotsylvania Court House, Virginia (Battalion)Not originally listed on unit homepage
** May 22-26, 1864 - Operations on Line of the North Anna River, Virginia
** May 26-28, 1864 - Operations on Line of the Pamunkey River, VirginiaNot originally listed on Dyer summary
** Totopotomoy May 28-31. 
* June 2, 1864 - Transferred to 5th New York Infantry as Companies E and F
== Regimental Roster ==
== Regiment Statistical Information ==
* Regiment lost during service 3 Officers and 61 Enlisted men killed and mortally wounded and 1 Officer and 59 Enlisted men by disease. Total 124.
== Legacy ==
== Notes ==
== Sources == 
* (Pages 758, 761, 895, 897, 900, 902, 903, 904, 905, 916, 933, 936, 938, 1410)
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