Map showing the military defences of Cincinnati, Covington and Newport Constructed under the direction of Brig. O. M. Mitchell, by Col. Charles Whittlesey in 1861: repaired and extended under the direction of Major Genl. H. G. Wright commanding Department of the Ohio, by Maj. J. H. Simpson, Chief Topogl. Engr. of the Dept. Bvt. Capt. W. E. Merrill, & Lieut. J. A. Tardy, Corps of Engs., and Col. Chas. Whittlesey, in 1862. Complied by order of Maj. Genl. H. G. Wright commanding Department of the Ohio, chiefly from surveys made under the direction of Maj. J. H. Simpson by W. H. Searles, G. A. Aschbach, O. P. Ransom, and J. R. Gillis, in Septr. & Octr. 1862. Published by authority of the Hon. the Sec. of War, in the office of the Chief of Engineers, U.S. Army.