surveyed under the orders of Bvt. Col. J.C. Duane, Major of Engineers, Chief Engineer, Army of the Potomac, by Bvt. Maj. C.W. Howell, 1st Lieut. of Engineers ; assisted by Messers. L.C. Oswell, L. Bell, and R.B. Talfor, topographical engineers ; J. Bien, lith., N.Y