Composed of Berkshire County men, and left the State Sept. 7, 1862. Arriving in Maryland it was assigned to Devens's (2d) Brigade of Couch's Division. This division was soon after attached to the Sixth Corps as the Third Division, General Newton in command. The Thirty-seventh participated in several battles, displaying praiseworthy steadiness, but sustaining slight loss, until Grant's campaign in 1864, when it took part in some bloody fighting. It crossed the Rapidan May 5, 1864, with 609 officers and men present for duty, and was soon in the thickest of the Wilderness fight. It lost there 30 killed, 101 wounded, and 6 missing; the latter were undoubtedly killed. An equally large percentage of loss occurred at Spotsylvania. In the various actions and skirmishes about that place, from May 8th to May 21st, its casualties amounted to 16 killed, 65 wounded, and 10 missing. In July the regiment was placed in the Third Brigade, Russell's (1st) Division, Colonel Edwards being placed in command of the brigade. At the battle of the Opequon the regiment lost 12 killed, and 79 wounded out of 296 men present in that action, and captured a stand of colors from Stonewall Jackson's old regiment. At Sailor's Creek the Thirty-seventh was commanded by Captain Arch. Hopkins, and encountered there some of the closest hand-to-hand fighting of the war. The regiment was one of the first to enter Petersburg, the surrender of the city being made to Colonel Edwards by the Mayor and Aldermen, Colonel Edwards being in command of the Sixth Corps skirmish-line.