Twenty-first regiment Massachusetts Infantry.
（1) Col. Augustus Morse
（2) Col. William S. Clark
|Field and Staff.||Line.||Band.||companies.||Unassigned Recruits.||Totals.|
|Number on regimental rolls,—|
|Enlisted men (included above) commissioned in regiment.2||9||–||–||5||3||2||4||3||1||3||2||3||2||–||37|
|Enlisted men (included above) serving elsewhere within regiment.||–||–||–||2||1||1||–||2||1||4||1||1||2||–||15|
|Actual total of members of regiment,—|
The 21st Mass. Infantry was organized during July and August, 1861, in camp at Worcester, Mass.
, and was mustered into service on varying dates from August 16 to the 23d, when it left the State
in command of Col. Augustus Morse
, and, remaining in Baltimore
a few days, moved on the 29th to Annapolis, Md.
, and encamped.
On September 17 the regiment was remustered.
In command of Lieutenant-Colonel Maggi
, and forming part of General Reno
's brigade, it sailed January 9 for North Carolina
in the Burnside
It suffered loss in the charge and capture of the enemy's works at the battle of Roanoke Island
February 8, was closely engaged at New Berne March 14, and took part in the expedition to Camden
The regiment moved with its brigade to Newport News July 6, becoming part of the 2d Brigade, Reno
's Division, 9th Army Corps.
Joining General Pope
's forces at the Rapidan
, it engaged at Manassas
August 30, and met heavy loss at Chantilly
It was engaged at South Mountain
, and was active at Fredericksburg
, encamping afterward at Falmouth, Va.
Leaving camp Feb. 9, 1863, the regiment moved to Kentucky
, to serve as part of the 9th Corps in the department of the Ohio, and went into camp at Mt. Sterling, Ky.
, April 3, moving in July to Lexington
and in August to Camp Nelson
on the Kentucky River
On September 12 it left camp for Knoxville, Tenn.
, and engaged in action at Blue Springs
October 10 and at Campbell's Station
During the siege of Knoxville
it took part in a charge on the morning of November 24.
While encamped near Rutledge, Tenn.
, after the raising of the siege, all but 24 of the members of the regiment re-enlisted for another term, and January 7 left camp to spend their furlough in Massachusetts
Leaving the State
March 18, on its return to duty the command joined the 9th Corps at Annapolis
and became part of the 2d brigade, General Stevenson
It took part at the Wilderness
May 6 and was active at Spotsylvania
May 10, 12 and 18; it shared in the movements to North Anna
and in the engagements at Cold Harbor.
Reaching the vicinity of Petersburg
June 16, it took part in the assault on that day and was closely engaged again on the 17th.
The regiment shared afterward in the duties of the siege, taking part with its division in the charge at the ‘Crater’ July 30.
On August 22 those whose term of service had expired returned to Massachusetts
and were mustered out Aug. 30, 1864.
The remainder, as a battalion of three companies, under command of Capt. Orange S. Sampson
, still serving in the trenches, engaged in action at the Weldon Railroad in August, and at Poplar Spring Church on September 30, when Captain Sampson
On Oct. 21, 1864, the command was transferred to the 36th Mass. Infantry by order of the War Department.