(a) Vicksburg was the last major port on the river held by the South (b) The city’s location on a high cliff made invasion all but impossible (c) Union navy cannons couldn’t reach the city (d) Vicksburg was held by General (e) John Pemberton with 18,000 soldiers (f) Grant with 35,000 men under his command surrounded the city, cut off their supplies and continually shelled them (g) The Confederates ran out of food and became sick—so they surrendered on July 4, 1863 (h) This victory gave the Union control of the Mississippi River which cut off a vital supply line for the South and cut the Confederacy in two.