On April 3 Henry advanced over the little river Najarilla against the enemy. The Spanish host fought after a different fashion from that practised by both sides in the French wars. Only Du Guesclin and the small remnant of the companies which still abode in Spain dismounted. The mass of the Castilians remained on their horses.
Henry fled in panic from the scene; Du Guesclin was again a prisoner, and the Najarilla was reddened by the blood of the thousands of fugitive Spaniards, for, caught as in a trap at the narrow bridge which offered the sole means of retreat, they were massacred without difficulty by the prince's troops.