Organized for three months' United States service April, 1861. Left State for Washington, D.C., April 20, 1861. Mustered in April 26. Duty in the Defenses of Washington until July. Attached to Porter's 1st Brigade, Hunter's 2nd Division, McDowell's Army of Northeast Virginia. Advance on Manassas, Va., July 16-21. Battle of Bull Run July 21. Mustered out at New York City August 2, 1861, expiration of term.