 The Union forces eventually pushed down the Mississippi River to besiege Vicksburg, Mississippi.After the surrender of Vicksburg and the fall of Port Hudson in the summer of 1863, the Mississippi River came under Union control and the Confederacy was cut in two.Davis was outraged at Beauregard for withdrawing from Corinth without a fight, even though he faced an army nearly twice his size and his water supplies in the city had become contaminated.