21st Massachusetts Infantry

== Regimental History and Service Record ==
Organized at Worcester July 19 to August 19, 1861. Moved to Baltimore, Md., August 23-25; thence to Annapolis, Md., August 29; and duty there until January 6, 1862. Attached to Reno's 2nd Brigade, Burnside's Expeditionary Corps, to April, 1862. 2nd Brigade, 2nd Division, Dept. of North Carolina, to July, 1862. 2nd Brigade, 2nd Division, 9th Army Corps, Army of the Potomac, to April, 1863. 2nd Brigade, 2nd Division, 9th Army Corps, Dept. of the Ohio, to June, 1863. Unassigned, 1st Division, 23rd Army Corps, Dept. of the Ohio, to October, 1863. 1st Brigade, 2nd Division, 9th Army Corps, Dept. of the Ohio, to April, 1864. 2nd Brigade, 1st Division, 9th Army Corps, Army of the Potomac, to June, 1863. 1st Brigade, 1st Division, 9th Army Corps, to September, 1864. 2nd Brigade, 1st Division, 9th Army Corps, to October, 1864.
SERVICE.--Burnside's Expedition to Hatteras Inlet January 6-February 7, 1862. Battle of Roanoke Island February 8. At Roanoke Island until March 11. Moved to New Berne March 11-13. Battle of New Berne March 14. Expedition to Elizabeth City April 17-19. Battle of Camden, South Mills, April 19. Duty at New Berne until July 6. Expedition to Pollocksville to relief of 2nd Maryland, May 17. Moved to Newport News, Va., July 6-9; thence to Fredericksburg August 2-4. March to relief of Gen. Pope August 12-15. Pope's Campaign in Northern Virginia August 16-September 2. Battles of Groveton August 29. Bull Run August 30, and Chantilly September 1. 
* September 3-20, 1862 - The Maryland Campaign
** Battles of South Mountain September 14
** September 17, 1862 - Battle of Antietam, Maryland
At Pleasant Valley, Md., until October 27. Movement to Falmouth, Va., October 27-November 17. Warrenton, Sulphur Springs, November 15. Battle of Fredericksburg December 12-15. "Mud March" January 20-24, 1863. At Falmouth until February 19. Moved to Newport News, Va., and duty there until March 26. Moved to Covington, Ky., March 26-April 1. At Paris, Ky., April 1-5. At Mt. Sterling until July 6, and at Camp Nelson until September 12. March to Knoxville September 12-20. Operations in East Tennessee October 22-November 4. Knoxville Campaign November 4-December 23. Campbell's Station December 16. Siege of Knoxville November 17-December 4. Pursuit of Longstreet December 5-29. Reenlisted December 29. Veterans absent on furlough January to March, 1864. Moved to Annapolis, Md., and Join 9th Army Corps. 
* 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 10, 1864 - Combat at Ny River, 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 24, 1864 - Combat at Ox 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, Virginia
Before Petersburg June 16-18. Siege of Petersburg June 16-October 21. Mine Explosion, Petersburg, July 30. Non-Veterans left front August 18 and mustered out August 30. 1864. Weldon Railroad August 18-21. Poplar Springs Church, Peeble's Farm, September 29-October 2. 
* October 21, 1864 - Veterans and Recruits transferred to 36th Massachusetts Infantry
== Regimental Roster ==
== Regiment Statistical Information ==
Source 	Casualties	Remarks
Dyer 	
* 11 Officers and 148 enlisted men killed and mortally wounded 
* 2 Officers and 89 enlisted men killed by disease
* Total 250	None
Fox 	
* Fox lists this unit as:
** 57th on the list of units with losses based on duration of the entire term of service of the unit (6th 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 761, 932, 933, 934, 935, 936, 937, 938, 940, 941, 1255)
* (Page 11)
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