Battle of Sark
1448 CE.
Shown on the map at 54.986°, -3.072°.
The Battle of Sark, or the Battle of Lochmaben Stone, was fought between Scotland and England on 23 October 1448 or 1449. It was a decisive Scottish victory, the first since the Battle of Otterburn in 1388, and the last pitched battle to be fought between the two kingdoms during the Medieval period.
Text from the Wikipedia article Battle of Sark, licensed CC BY-SA 4.0.