Organized at Elmira, N.Y., and mustered in for two years May 22, 1861. Left State for Washington, D.C., June 5, and duty in the Defenses of that city until July. Attached to Sandford's Division, Patterson's Army, July. Butterfield's Brigade, Patterson's Army, July 11-29, 1861. 1st Brigade, Banks' Division, Army of the Potomac, to September 15, 1861. 3rd Brigade, Banks' Division, Army of the Potomac, to December, 1861.
SERVICE.--Joined Patterson's Army July 6, 1861. Occupation of Martinsburg, Va., July 10. Skirmish at Bunker Hill July 17. Picket duty at Bolivar Heights July 25. Occupation of Maryland Heights July 28. Lovettsville August 8 (Detachment). Moved to Hyattstown August 16. Duty near Darnestown until September 24. Duty on Upper Potomac until December. Designation of Regiment changed to 3rd Regiment New York Light Artillery December 11, 1862.