A class of ships named after cities on this body of water were nicknamed “Pook Turtles” due to their shell-like shape. Though originally (-5[1])created as an army division, a “Western Gunboat Flotilla” was renamed for this body of water after being transferred to its country’s navy. “Tinclads” converted from civilian boats operated mostly on this (-5[1])body of water and provided the origin of the phrase “brown-water navy.” (10[1])Battles named for features on this body of water included Milliken’s Bend (10[1])and Island Number Ten. (10[2])Over (10[2])1000 people, including prisoners freed (10[1])from Andersonville, (10[2])died (10[1])in this body of water (10[1])after an overladen (10[1]-5[1])boat exploded (10[1])in the Sultana disaster. (10[1])A siege of a fortress city (-5[1])on this river ended with (-5[1])the surrender of John C. Pemberton. For 10 points, an 1863 (10[1])victory at the Siege (-5[1])of (10[1])Vicksburg (10[2])on what river (10[2])bisected the Confederacy? ■END■ (10[3])