21st Connecticut Infantry Regiment The 21st Connecticut Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War . Service . The 21st Connecticut Infantry was organized at Norwich , Connecticut on August 22 , 1862 under the command of Colonel Arthur H . Dutton . The regiment was attached to 2nd Brigade , 3rd Division , IX Corps , Army of the Potomac , to January 1863 . 3rd Brigade , 3rd Division , IX Corps , to April 1863 . 3rd Brigade , 2nd Division , VII Corps , Department of Virginia , to July 1863 . 3rd Brigade , Getty ' s Division , Portsmouth , Virginia , Department of Virginia and North Carolina , to October 1863 . Heckman ' s Command , Newport News , Virginia , Department of Virginia and North Carolina , to February 1864 . Defenses of New Bern , North Carolina , Department of Virginia and North Carolina , to March 1864 . Sub - District of the Pamlico , North Carolina , Department of Virginia and North Carolina , to May 1864 . 3rd Brigade , 1st Division , XVIII Corps , Department of Virginia and North Carolina , to December 1864 . 3rd Brigade , 3rd Division , XXIV Corps , Department of Virginia , to June 1865 . The 21st Connecticut Infantry mustered out of service June 16 , 1865 . Detailed service . Left Connecticut for Washington , D . C . , September 11 . Duty at Arlington Heights , Va . , Defenses of Washington , D . C . , November 1862 . March to Falmouth , Va . , November 7 – 19 . Battle of Fredericksburg , Va . , December 12 – 15 . Burnside ' s 2nd Campaign , " Mud March , " January 20 – 24 , 1863 . Moved to Newport News , Va . , February 6 – 9 , then to Suffolk , Va . , March 13 . Siege of Suffolk April 12 – May 4 . Chuckatuck and Reed ' s Ferry , Nansemond River , May 3 . Siege of Suffolk raised May 4 . Reconnaissance to Chickahominy June 9 – 16 . Moved to Portsmouth , Va . , June 16 . Provost and guard duty at Portsmouth and Norfolk November 10 . Moved to Newport News November 10 , and duty there February 1864 . Expedition up the James River to Fort Powhatan January 24 – 25 . Smithfield February 1 . Moved to Morehead City , N . C . , February 3 , then to New Bern February 12 , and duty there , Plymouth , and Washington , North Carolina , April . Near Blount ' s Creek April 5 . Moved to Portsmouth , Va . , April 28 . Butler ' s operations on south side of the James River and against Petersburg and Richmond May 10 – 28 . Swift Creek , or Arrow field Church , May 10 . Operations against Fort Darling May 12 – 16 . Battle of Drewry ' s Bluff May 14 – 16 . At Bermuda Hundred May 17 – 27 . Moved to White House , then to Cold Harbor May 27 – 31 . Battles about Cold Harbor June 1 – 12 . Before Petersburg June 15 – 18 . Siege operations against Petersburg and Richmond June 16 , 1864 to April 2 , 1865 . Hare ' s Hill June 24 – 28 , 1864 . In the trenches at Bermuda Hundred August 25 – September 27 , 1864 . Chaffin ' s Farm , New Market Heights , September 28 – 30 . Fair Oaks October 27 – 28 . Duty in trenches before Richmond March , 1865 . Expedition to Fredericksburg March 5 – 8 , and up the Potomac River March 11 – 13 . Moved to White House March 13 – 18 , then to Signal Hilt , before Richmond , March 24 – 26 . Occupation of Richmond April 3 . Moved to Columbia April 28 , and duty there June . Casualties . The regiment lost a total of 175 men during service ; 5 officers and 55 enlisted men killed or mortally wounded , 1 officer and 114 enlisted men died of disease .