During the hottest days of the summer of 1863, while the nation's attention was focused on a small town in Pennsylvania known as Gettysburg, another momentous battle was being fought along the banks of the Mississippi. In the longest single campaign of the war, the siege of Vicksburg left 19,000 dead and wounded on both sides, gave the Union Army control of the Mississippi, and left the Confederacy cut in half. In this highly-anticipated new...