The Battle of Bailén was contested in 1808 between the Spanish Army of Andalusia, led by Generals Francisco Castaños and Theodor von Reding, and the Imperial French Army's II corps d'observation de la Gironde under General Pierre Dupont de l'Étang. The heaviest fighting took place near Bailén (sometimes anglicized Baylen), a village by the Guadalquivir river in the Jaén province of southern Spain.