12th Massachusetts Infantry

== Regimental History and Service Record ==
* Organized at Fort Warren and mustered in June 26, 1861
* Moved to Sandy Hook, Md., July 23-27
* Attached to (I) Department of the Shenandoah / 2nd Brigade (Abercrombie), Brigaded with:
** 2nd Massachusetts Infantry
** (I) 12th Indiana Infantry
** (I) 16th Indiana Infantry
** 4th Connecticut Infantry
** 1st United States Artillery / Battery E
* Abercrombie's Brigade, Banks' Division, Army of the Potomac, to March, 1862
* 2nd Brigade, Williams' 1st Division, Banks' 5th Army Corps and (II) Dept. of the Shenandoah, to May, 1862
* 3rd Brigade, 2nd Division, Dept. of the Rappahannock, to June, 1862
* 3rd Brigade, 2nd Division, 3rd Army Corps, Army of Virginia, to September, 1862
* 3rd Brigade, 2nd Division, 1st Army Corps, Army of the Potomac, to November, 1862
* 2nd Brigade, 2nd Division, 1st Army Corps, to March, 1864
* 2nd Brigade, 2nd Division, 5th Army Corps, to May, 1864
* 2nd Brigade, 3rd Division, 5th Army Corps, to July, 1864.
SERVICE.--Operations on the Upper Potomac August, 1861, to February, 1862. Operations opposite Edward's Ferry October 21-24, 1861. Operations in the Shenandoah Valley March 24-April 27. Strasburg March 27. Edenburg April 1-2. Rappahannock Crossing April 18. Battle of Cedar Mountain August 9. Pope's Campaign in Northern Virginia August 16-September 2. Rappahannock Station August 20-23. Thoroughfare Gap August 28. Bull Run August 30. Chantilly September 1. 
* September 3-20, 1862 - The Maryland Campaign
** September 14, 1862 - Battle of South Mountain, Maryland
** September 17, 1862 - Battle of Antietam, Maryland
Duty at Sharpsburg until October 30. Movement to Warrenton, thence to Falmouth, Va., October 30-November 19. Battle of Fredericksburg December 12-15. "Mud March" January 20-24, 1863. At Falmouth and Belle Plain, Va., until April 27. 
* April 27-May 6, 1863 - The Chancellorsville Campaign
** Operations at Pollock's Mill Creek April 29-May 2. 
** Fitzhugh's Crossing April 29-30.
** May 1-5, 1863 - Battle of Chancellorsville, Virginia
* June 11-August 1, 1863 - The Gettysburg Campaign
** July 1-3, 1863 - Battle of Gettysburg, Pennsylvania
Picket duty on the Rapidan until October. Bristoe Campaign October 9-22. Advance to line of the Rappahannock November 7-8. Mine Run Campaign November 26-December 2.
* Demonstration on the Rapidan February 6-7, 1864.
* 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, Virginia
*** May 12, 1864 - Assault on the Salient at Spotsylvania Court House, Virginia
** May 22-26, 1864 - Operations on Line of the North Anna River, Virginia
*** May 25, 1864 - Engagement at Jericho Ford, 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
*** June 1-3, 1864 - Battle of Bethesda Church, VirginiaNot originally listed on unit homepage
** White Oak Swamp June 13. 
* Before Petersburg June 16-18. 
* June 25, 1864 - Ordered home for muster out
* July 8, 1864 - Mustered out of federal service
== Regimental Roster ==
== Regiment Statistical Information ==
Source 	Casualties	Remarks
Dyer 	
* 18 Officers and 175 enlisted men killed and mortally wounded 
* 83 enlisted men killed by disease
* Total 276	None
Fox 	
* Fox lists this unit as:
** 84th on the list of units with losses based on duration of the entire term of service of the unit (11th of the Massachusetts troops)	
WotRWiki Statistics	
* troops killed
** Includes troops mortally wounded
** Includes troops killed by disease
** All others are troops killed in action or under special circumstances	
== Legacy ==
== Notes ==
== Sources == 
* (Pages 272, 761, 827, 905, 916, 932, 933, 934, 936, 937, 938, 939, 941, 1252)
* (Page 11)
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