Battle of Krosno Odrzańskie
1015 CE.
Shown on the map at 52.053°, 15.113°.
The Battle of Krosno Odrzańskie was fought in August of 1015 during the German–Polish War, between the army of the Duchy of Poland led by Bolesław I the Brave, against the army of the Holy Roman Empire led by Henry II. It was fought in Krosno Odrzańskie, Poland. It ended on 3 August with German victory, as their forces managed to break through the defensive positions of Poland.
Text from the Wikipedia article Battle of Krosno Odrzańskie, licensed CC BY-SA 4.0.