...n was Brig.-Gen. Thomas' command, was headed by him, and included the U. S. Cavalry, (recently from Texas,) 4 companies, the Philadelphia City Troop, and the 2 companies of artillerists, commanded by Captains Doubleday and Seymour, McMullin's Independent Rangers, the Twenty-third Regiment, Col. Dare, the Twenty-first Regiment, Col. Ballier, and the Sixth Regiment, Col. Nagle. The line was nearly 2 miles in length...