This map was apparently captured by Confederate cavalry under the command of Maj. Gen. Earl Van Dorn during a raid on the Union arsenal at Holly Springs, Miss., in December 1862, and forwarded to the Confederate Engineer's Office in Richmond, Va.
Nicholson, W. L. - Bache, Alexander Dallas - Krebs, Charles G. - Confederate States of America. Army. Dept. Of Northern Virginia. Chief Engineer's Office - U.S. Coast and Geodetic Survey