The Battle of Bailén was fought in 1808 between the Spanish Army of Andalusia, led by General Francisco Javier Castaños 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, a village by the Guadalquivir river in the Jaén province of southern Spain.

The Austrian Empire, officially known as the Empire of Austria, was a multinational European great power from 1804 to 1867, created by proclamation out of the realms of the Habsburgs. During its existence, it was the third most populous monarchy in Europe after the Russian Empire and the United Kingdom. Along with Prussia, it was one of the two major powers of the German Confederation. Geographically, it was the third-largest empire in Europe after the Russian Empire and the First French Empire.