French 4th Corps (with attached Polish division under general Valance) had to cross the bridge over the Guadiana River which was defended by the Spanish corps of Count Urbina Cartaojal. Polish lancers of the Legion of the Vistula under colonel Jan Konopka charged through the bridge taking it by surprise, then outflanked Spanish infantry and attacked it from behind as the main French and Polish forces crossed the bridge, and attacked the Spanish front lines. The battle was over when undisciplined Spanish soldiers dispersed, and began to retreat in the direction of Santa Cruz.