American Civil War: During the Vicksburg campaign, Union forces under Ulysses S. Grant win the Battle of Port Gibson and establish a firm presence on the east side of the Mississippi River.

The Vicksburg campaign was a series of maneuvers and battles in the Western Theater of the American Civil War directed against Vicksburg, Mississippi, a fortress city that dominated the last Confederate-controlled section of the Mississippi River. The Union Army of the Tennessee under Major General…