May 7 Organized at New Haven under Colonel Alfred H. Terry, Lieutenant Colonel Young and Major Colburn.
May 10 Left State for Washington, D.C. on the steamship Cahawba
May 14 Arrived in Washington, camping at Meridian Hill
May 16 Crossed the Long Bridge into Virginia and continued to Taylor’s Tavern on Oak Hill.
June Attached to Key’s 1st Brigade, Tyler’s Division, McDowell’s Army of Northeastern Virginia
June 1-3 Advance to Vienna and Falls Church, Va.
June 4- July 15 Picket duty at Falls Church
July 16-21 Advance on Manassas
July 17 Occupation of Fairfax C. H.
July 21
Battle of Bull Run

The regiment lost 2 men killed or mortally wounded and 16 men captured. After the battle the regiment fell back in good order to Centreville and continued on to Oak Hill.

July 22-23 The regiment worked with the 1st and 3rd Connecticut Infantry Regiments to strike the deserted camps of other regiments, saving large quantities of arms and equipment.
August 7 Mustered out in New Haven