 Complete the following phrase:  His first assignment was to command a recruiting camp near Columbus, and then the Kanawha Brigade of the Department of the Ohio. His brigade joined the Department of Western Virginia and fought successfully in the early Kanawha Valley campaign under Maj. Gen. George B. McClellan. In 1862 the brigade moved to Washington, D.C., and was attached to John Popes Army of Virginia, but was delayed by McClellan and so did not see action at the Second Battle of Bull Run with the rest of the army. At the beginning of the Maryland Campaign, Coxs brigade became the Kanawha Division of the IX Corps of the Army of the Potomac. In the Maryland campaign, Coxs men took the important city of Frederick, Maryland, and Cox led the assault on the Confederates on September 14, 1862, at the 