On 19 November, the massed battery pounded the Spanish center as Leval attacked Castejon and Werlé went in against Lacy's division. At first the Spanish swung their line back. Then, as the IV Corps halted to wait for artillery to be brought up, the two Spanish divisions surged forward into musket range and opened fire. The Dutch, Germans and Poles began to edge rearward. Soult ordered up Girard's division to support the wavering IV Corps battalions.
While this was going on, Milhaud's dragoons, supported by Woirgard and Paris, moved rapidly toward the vulnerable Spanish right flank. Screened by olive groves, they suddenly appeared in front of Freire's command. The French charged and soon routed the Spanish horsemen. Milhaud, Paris and Woirgard neatly wheeled their squadrons and tore into the unprotected flank of Lacy's infantry. Soult sent the French line forward. The massed battery savaged the Spanish line with renewed fury.
Faced by the threat of infantry pressing their front while cavalry slashed into their flank, the Spanish divisions collapsed one after another and bolted for the rear. At this crisis, Dessolles and the Royal Guard dashed across the ravine and burst into Ocaña, severing the Spanish left from their disintegrating center and right. As the Spanish army streamed away to the south, only Zayas's division remained intact to cover the retreat. Soult's cavalry pressed the pursuit and broke Zayas later in the day.
Results:The French captured 14,000 Spaniards, 50 cannon, 30 flags and the entire baggage train. Another 4,000 were killed and wounded. French losses were 2,000 killed and wounded. Paris was killed and Girard wounded. This catastrophe temporarily laid Spain open to French domination. The northern Spanish army was beaten a week later at the Battle of Alba de Tormes. The way was open for the French conquest of Andalusia.