On May 18, 1863, Major General Ulysses S. Grant achieved the objective he had sought for months. Union troops surrounded Vicksburg on three sides, and on its west side, Admiral David Porter's warships controlled the waters of the Mississippi. For three months Confederate Lieutenant General John C. Pemberton had watched as Grant flailed about in the floodplain on various unsuccessful bayou expeditions. Dur: 18mins File: .mp3