Fort Beauregard
Louisiana, United States · built 1862
Fort Beauregard, located half a mile north of the village of Harrisonburg, Catahoula Parish, Louisiana, was one of four Confederate forts guarding the Ouachita River during the American Civil War. In 1863, four Union gunboats attacked it, unsuccessfully.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).