La batalla de Montiel Historical milestone · Montiel, Campo de Montiel, Ciudad Real Image of Montiel, not of the place itself. The Battle of Montiel, fought on 14 March 1369 around this town, was the outcome of the Castilian civil war between Peter I and his half-brother Henry of Trastámara, a conflict that also formed part of the Hundred Years' War: France backed Henry's claim to the throne by sending the constable Bertrand du Guesclin, while England, through the Black Prince, supported Peter with arms and men. After the allied defeat at Nájera in 1367, Henry gathered a Castilian-French army which, with Du Guesclin's mercenaries, defeated Peter's troops on the plain of Montiel; the defeated king took refuge in the castle of La Estrella, where he would die nine days later. 14 de marzo de 1369 Photo: Español002 (CC BY-SA 4.0) What to see and do in Montiel