Battle of Fredericia
1849 CE.
Shown on the map at 55.568°, 9.753°.
The Battle of Fredericia was fought between soldiers of Schleswig-Holstein and Denmark on 6 July 1849 at Fredericia in Denmark. The battle was part of the First Schleswig War, which was a conflict between Schleswig-Holstein, supported by several German states, and Denmark. The Danes won the battle.
Text from the Wikipedia article Battle of Fredericia, licensed CC BY-SA 4.0.