Battle of Pwll Melyn
1405 CE.
Shown on the map at 51.718°, -2.954°.
The Battle of Pwll Melyn (also known as the Battle of Usk) was a battle between the Welsh and English on 5 May 1405. It was part of the Glyndŵr Rising that lasted from 1400 to 1415. It was the first English victory in a pitched battle during the war. The battle resulted in heavy casualties for the Welsh, including two important commanders, Owain Glyndwr's brother and eldest son.
Text from the Wikipedia article Battle of Pwll Melyn, licensed CC BY-SA 4.0.