Shows the positions of the U.S. forces under the command of Maj. Genl. U. S. Grant, U.S. Vol. and Maj. Genl. D. C. Buell, U.S. Vol. on the 6th and 7th of April 1862 Surveyed under the direction of Col. Geo. Thom, Chief of Topl. Engrs. Drawn by Otto H. Mat