On June 28, 1861, the three newly created three-year regiments began the journey to Virginia, where in June they were joined with a brigade of three-month enlistment New Jersey Militia regiments to form a division commanded by Brig. Gen. Theodore Runyon. This was the first time the New Jersey regiments officially formed the brigade. During the First Bull Run Campaign, most of the brigade saw service in the field guarding train hubs, supply depots and roadways, being considered too "green" to be reliable in combat. However, a few companies of the 1st and 2nd New Jersey Infantries were directed to help stem the retreat at Centreville, Virginia, after the Confederates routed General Irvin McDowell's forces at Manassas, Virginia, on July 21, 1861. They were unsuccessful, and many officers and men retreated in the route as well.