Battle of Bornhöved
1227 CE.
Shown on the map at 54.067°, 10.200°.
The (second) Battle of Bornhöved took place on 22 July 1227 near Bornhöved in Holstein. Count Adolf IV of Schauenburg and Holstein — leading an army consisting of troops from the cities of Lübeck and Hamburg, Dithmarschen, Holstein, and various Northern German nobles, defeated King Valdemar II of Denmark and the Welf Otto the Child.
Text from the Wikipedia article Battle of Bornhöved (1227), licensed CC BY-SA 4.0.