The Regiment was authorized on April 27, 1775 in the Connecticut State Troops as the 4th Connecticut Regiment. Organized between May 1-20, 1775, to consist of 10 companies from Litchfield and Hartford Counties. Each company to consist of 1 captain or field grade officer, two lieutenants, one ensign, four sergeants, four corporals, one drummer. one fifer, and 100 privates. Adopted on June 14, 1775 into the Continental Army. Disbanded in December 1775 in Canada, less two companies disbanded 19-20 December 1775 at Cambridge, Massachusetts. These latter two were Lieutenant Colonel Ozias Bissell's and Captain Hezekiah Parsons' Companies, which stayed behind to serve at the Siege of Boston. Re- organized between January 1-April 1777 at Norwich to consist of 8 companies from New London, Windham, and Hartford Counties. Re-formed again January 1, 1781 by redesignating the old 6th Connecticut. Served until January 1, 1783 when it was broken up. Half its remaining enlisted men were incorporated into the 1st Connecticut Regiment; half into the 3rd Connecticut Regiment.