Map titles: Yazoo River defences at Walnut Hills near Vicksburg, Miss. occupied by the U.S. Naval Forces May 20, 1863; Haines Bluff, Miss. showing the positions of the attacking gunboats April 30th - May 1st, 1863; Survey of a canal connecting Walnut Bayou with the Mississippi River dug by the U.S. Forces under Genl. Grant in April 1863; Vicksburg and vicinity.