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An Aragonese cavalry force defeats a superior Castilian cavalry force in the Battle of Araviana during the War of the Two Peters.

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Battle of Araviana
The Battle of Araviana was a cavalry action fought during the War of the Two Peters on 22 September 1359. Eight hundred Aragonese horse, many of them Castilian exiles in service of the Crown of Aragon under Henry of Trastámara, had launched a cavalgada in Castilian territory…Source: Wikipedia (CC BY-SA)
War of the Two Pedros
Confrontation between the Castilian and Aragonese crowns.
The War of the Two Peters, also known as the Castilian–Aragonese War of 1356–1369, was fought from 1356 to 1369 between the crowns of Castile and Aragon. The conflict was a struggle between two claimants to the throne of Castile, Peter of Castile and Peter IV of Aragon. The…Source: Wikipedia (CC BY-SA)
September 22
Day of the year
September 22 is the 265th day of the year in the Gregorian calendar; 100 days remain until the end of the year.Source: Wikipedia (CC BY-SA)