During the American Civil War, a pivotal battle between the Union and Confederate forces occurred along the Big Black River, culminating in the Siege of Vicksburg in 1863. Commanded by General Ulysses S. Grant, Union forces defeated Confederate troops under General John C. Pemberton at the Battle of Champion Hill. Grant chased Pemberton, who was headed toward Vicksburg. Pemberton left 5,000 troops to make a stand on both sides of the Big Black River after his Champion Hill defeat, while he withdrew with his main command to nearby Vicksburg.