1. Map of battlefield of Big Black River Bridge, Mississippi, showing the positions of the U.S. troops, May 17th 1863 Maps Pennsylvania State University Public content 1863. Mason, F. (Act. Asst. Engineer). Scale approximately 1:7,200; 1 map: color; 49 x 45 cm Big Black River (Miss.)--History--Civil War, 1861-1865--Maps.