Port Gibson was the site of several clashes during the American Civil War and figured in Ulysses S. Grant's Vicksburg Campaign. The Battle of Port Gibson occurred on May 1, 1863, and resulted in the deaths of over 200 Union and Confederate soldiers. The battle was a turning point in the Confederates' ability to hold Mississippi and defend against an amphibious attack. Port Gibson is the site of the Port Gibson Oil Works, a cottonseed oil plant.