The 5th Connecticut Infantry Regiment was organized at Hartford, Connecticut and mustered in for a three-year enlistment on July 26, 1861, under the command of Colonel Orris Sanford Ferry.
The regiment was attached to George H. Thomas' Brigade, Banks' Division, to October 1861.
Gordon's Brigade, Banks' Division, Army of the Potomac, to March 1862.
1st Brigade, 1st Division, Banks' V Corps, and Department of the Shenandoah to June 1862.
1st Brigade, 1st Division, II Corps, Army of Virginia, to September 1862.
2nd Brigade, 3rd Division, XX Corps, Army of the Cumberland, April 1864.
2nd Brigade, Bartlett's Division, XXII Corps, Department of Washington to July 1865.
They then moved to Harpers Ferry, West Virginia on July 30, and did duty there until August 16.
Next they did guard and outpost duty on the Upper Potomac until February 1862.
March to Fairfax Station December 10–14, and duty there until January 19, 1863.
Moved to Stafford Court House January 19–23, and duty there until April 27.
Near Raccoon Ford, Va. until September 24, 1863 At this point they shifted from the Virginia/West Virginia/Maryland/Pennsylvania region to Alabama, Tennessee and Georgia.
March to Brandy Station, then to Bealeton and movement to Stevenson, Alabama, September 24-October 3.
Guard duty along Nashville and Chattanooga Railroad at Cowan and Cumberland Tunnel until April 1864.
Operations on line of Pumpkin Vine Creek and battles about Dallas, New Hope Church, and Allatoona Hills May 26-June 5.
Operations about Marietta, Georgia and against Kennesaw Mountain June 10-July 2.
Ruff's Station, Smyrna Camp Ground July 4.