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The Battle of Plains Store was fought on May 21, 1863, in East Baton Rouge Parish, Louisiana, during the campaign to capture Port Hudson in the American Civil War. Union troops advancing from Baton Rouge, Louisiana, clashed with 600 Confederates at a road junction. The initial Confederate force withdrew, but 400 more Confederates arrived from Port Hudson. Some of the Confederate reinforcement overran Union artillery and routed a Union regiment, but were unable to capture the guns. Union reinforcements advanced to the front, attacked part of the Confederate force and drove them from the field. The Confederates withdrew to Port Hudson, which was almost entirely surrounded by Union troops the next day. Port Hudson was under siege until the defenders surrendered on July 9.