The 11th Connecticut Volunteer Infantry Regiment lost 8 officers and 140 enlisted men killed or mortally wounded and 1 officer and 176 enlisted men to disease during the Civil War. A monument to the 11th Connecticut is on the Antietam battlefield near Burnside’s Bridge.

October 24 – November 14 Organized at Hartford under Colonel Henry W. Kingsbury (USMA 1861), Lieutenant Colonel Charles Matthewson, and Major Griffin A. Stedman.
December 16 Left State for Annapolis, Md.
January 7-
February 8
Burnside’s expedition to Hatteras Inlet and Roanoke Island, N. C. Attached to Williams’ Brigade, Burnside’s Expeditionary Corps.
February 8 Battle of Roanoke Island
February At Roanoke Island
March 11-13 Moved to Newberne
March 14 Battle of Newberne
March-July Duty at Newberne
April Attached to 2nd Brigade, 2nd Division, Dept. of North Carolina
June 11 Lieutenant Colonel Matthewson resigned and Major Stedman was promoted to lieutenant colonel.
July 2 Moved to Morehead City
July 3-5 To Newport News, Va.
July Attached to 2nd Brigade, 3rd Division, 9th Army Corps, Army of the Potomac
August 1-6 Moved to Fredericksburg
August 31-September 3 Moved to Brooks’ Station, then to Washington, D.C.
Maryland Campaign
September 14 Battle of South Mountain
September 16-17
Battle of Antietam

Colonel Kingsbury led the regiment in an unsuccessful attack on Burnside’s Bridge. The regiment continued to provide cover fire to new attacks, and Colonel Kingsbury was mortally wounded, shot four times. Lieutenant Colonel Stedman took command of the regiment. He was badly wounded in the leg but refused to leave the field until the battle was over.

The regiment’s monument just to the east of Burnside’s Bridge on the Antitetam battlefield lists the 37 men who were killed or mortally wounded at Antietam:

Col. W. Kingsbury
Capt. J.D. Griswold, Co. A
Christian Steinmetz, Co. C
William Halbeass, Co. C
1st Sergt. J.R. Read, Co. D
Corp. G.R. Crane, Co. D
Edward Demming, Co. D
Lewis Dayton, Co. D
Alvin Flint, Co. D (Jr.)
1st Sergt. Hiram C. Roberts, Co. E
Corp. Theodore S. Bates, Co. E
Benjamin J. Beach, Co. E
William F. Coggswell, Co. E
Theodore Parrett, Co. E
George L. Wilson, Co. E
Clinton Fessington, Co. F
David Tarboc, Co. F
Fennimore Weeks, Co. F
Frank Chaffee, Co. G
George H. Heflin, Co. G
William H. Hitchcock, Co. G
Corp. David M. Ford, Co. H
Corp. John C. Holwell, Co. H
Corp. Orville F. Armstrong, Co. H
Davis Batty, Co. H
William H. Hall, Co. H
Thomas Lawson, Co. H
Charles H. Morse, Co. H
Asa W. Rouse, Co. H
John H. Walker, Co. H
James Morgan, Co. I
John Murray, Co. I
Albert Todd, Co. I
1st Sergt. George E. Bailey, Co. K
Henry W. Davis, Co. K
William H. Houghton, Co. K
William Lane, Co. K

103 men were also wounded in the battle.

September – October Duty at Pleasant Valley, Md.
September 25 Lieutenant Colonel Stedman was promoted to colonel.
October 27-November 19 Movement to Falmouth, Va.
December 12-15
Battle of Fredericksburg
January 20-24 Burnside’s 2nd Campaign, “Mud March”
February 6-9 Moved to Newport News, Va.
March 13 To Suffolk
April 12-May 4 Siege of Suffolk. Attached to 2nd Brigade, 2nd Division, 7th Army Corps, Dept. of Va.
April 24 Edenton Road
May 3 Providence Church Road and Nansemond River
May 4 Siege of Suffolk raised
June 9-16 Reconnaissance to the Chickahominy
June 24-July 7 Dix’s Peninsula Campaign
July 1-7 Expedition from White House to South Anna River
July Moved to Portsmouth, Va. and attached to 2nd Brigade, Getty’s Division, Portsmouth, Va., Deptartment of Virginia and North Carolina
October 1 Moved to Gloucester Point
January The regiment reenlisted for the duration of the war.
April Attached to 2nd Brigade, 2nd Division, 18th Army Corps, Dept. Va. and N. C.
May 4-28 Butler’s operations on south side of the James River and against Petersburg and Richmond
May 5 Occupation of Bermuda Hundred, Va.
May 7 Port Walthal Junction, Chester Station
May 9-10 Swift Creek or Arrow field Church
May 12-16 Operations against Fort Darling, Battle of Drewry’s Bluff
May 17-27 On Bermuda Hundred front
May 27-31 Moved to White House, thence to Cold Harbor
June 1-12
Battles about Cold Harbor
June 15-18 First Assault on Petersburg
June 16 – April 2 Siege operations against Petersburg and Richmond
July 30 Mine explosion Petersburg (Reserve)
August 5 Colonel Stedman was mortally wounded, shot in the stomach after a skirmish while talking with General Ames. He died the next day. A major redoubt on the Union defensive line would be named after him.
August 25 On Bermuda Hundred front, attached to Provisional Division, Army of the James
December On north side of the James before Richmond, attached to 1st Brigade, 3rd Division, 24th Army Corps, Dept. of Va.
April 3 Occupation of Richmond
April-December Duty at Richmond and Lynchburg, Va.
July Attached to 1st Independent Brigade, 24th Army Corps
December 21 Mustered out