Battle of Montiel

The Battle of Montiel was fought in 1369 between Franco-Castilian forces, and an alliance of pro-English forces.

Background
In 1366 there was a civil war of succession in Castile the  ruler, Peter of Castile's forces, was pitched against those of  his half brother Henry of Trastámara. Peter was supported by England and Trastámara by the French. Edward, Prince of Wales, known as the Black Prince, led the English forces and the French were led by Bertrand du Guesclin

The armies in support of Trastámara were defeated at the battle of Najera (1367); however, this was of dubious long-term significance as Peter of Castile and the Black Prince fell out over money. The Black Prince, also affected by dysentery, withdrew his support from Peter and returned to Aquitaine.

The battle
The Battle of Montiel was fought between Franco-Castilian forces, and an alliance of pro-English forces. The Franco-Castilian force was led by Bertrand du Guesclin, while Peter of Castile led a Castilian-Granadine force. The Franco-Castilians were victorious largely thanks to the tactics of du Guesclin.

The aftermath
After the battle, Peter fled to the castle of Montiel, where he became trapped. In an attempt to bribe Bertrand du Guesclin, Peter was lured into a trap outside the castle. In a confrontation with his stepbrother Henry, Peter was killed. His death on 23 March 1369 marked the end of the Castilian Civil War. His victorious half-brother was crowned Henry II of Castille.

Henry made du Guesclin, Duke of Molina and he formed an alliance with French King Charles V. Between 1370 and 1376, the Castilian fleet provided naval support to French campaigns against Aquitaine and the English coast, while du Guesclin recaptured Poitou and Normandy from the English.