The 18th Connecticut Infantry Regiment lost 4 officers and 67 enlisted men killed or mortally wounded and 1 officer and 80 enlisted men to disease during the Civil War. The regiment is honored by a monument in the National Cemetery in Winchester, Virginia.

Organized at Norwich
August 22 Left State for Baltimore, Md.
August Duty at Forts McHenry and Marshall, Defenses of Baltimore attached to Defenses of Baltimore, Md., 8th Corps, Middle Dept.
January Attached to 2nd Separate Brigade, 8th Corps
February Attached to 2nd Brigade, 2nd Division, 8th Army Corps
May 22 Moved to Winchester, Va., and Joined Milroy’s Command
June Assigned to Scammon’s Division, Dept. West Virginia
June 13-15 Second Battle of Winchester
June 15 Most of the regiment was captured
July 2 Regiment was paroled
September 30 Non-captured part of regiment on Provost duty at Hagerstown, Md.,
October 1 Regiment exchanged. Moved to Martinsburg, Va., to join those not captured.
December Assigned to 3rd Brigade, 1st Division, Department of West Virginia
March At Martinsburg
March 7-28 At Bolivar Heights
March 16-18 Reconnaissance toward Snicker’s Gap
March 28-April 9 On furlough
April 29-May 17 Sigel’s Expedition from Martinsburg to New Market. Assigned to 1st Brigade, 1st Infantry Division, Department of West Virginia.
May 15 Battle of New Market
May 26-July 1 Hunter’s Expedition to Lynchburg
May 26-June 5 Advance on Staunton
June 5 Action at Piedmont, Mount Crawford
June 6 Occupation of Staunton
June 17-18 Lynchburg
July 1-18 Moved to Camp Piatt, then to Parkersburg, Cumberland, Md., Martinsburg, Harper’s Ferry and Snicker’s Ford. Attached to 2nd Brigade, 1st Division, Deartment of West Virginia
July 18 Snicker’s Ferry
July 24 Battle of Kernstown, near Winchester
July 25 Martinsburg
August-September At Charlestown, W. Va.
October 1-29 At Martinsburg
November 11 Moved to New Haven, Conn., and duty at Conscript Camp
November 11-13 Moved to Martinsburg, W. Va. and assigned to 1st Brigade, 3rd Division, West Virginia
November 23 To Halltown
April Assigned to 1st Brigade, 2nd Division, West Virginia
June At Martinsburg
June 27 Mustered out at Harper’s Ferry, W. Va.