Battle of Myślibórz
1278 CE.
Shown on the map at 52.925°, 14.866°.
The Battle of Myślibórz (also known as the Battle of Soldin) was a battle which took place in August 1278. It was fought between the Duchy of Greater Poland led by Bolesław the Pious and the Duchy of Pomerelia led by prince Mestwin II against the Margraviate of Brandenburg led by Otto IV. It resulted in a Polish victory.
Text from the Wikipedia article Battle of Myślibórz, licensed CC BY-SA 4.0.