Battle of Bailén
The Battle of Bailén was fought 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. This battle was the first open-field defeat of a Napoleonic army. The heaviest fighting took place near Bailén (sometimes anglicized "Baylen"), a village by the Guadalquivir river in the Jaén province of southern Spain.