Battle of Trautenau
1866 CE.
Shown on the map at 50.556°, 15.915°.
The Battle of Trautenau (German: Schlacht bei Trautenau) or Battle of Trutnov was fought on 27 June 1866, during the Austro-Prussian War. It was the only battle of the war that ended in an Austrian victory over the Prussians, but at a large cost.
Text from the Wikipedia article Battle of Trautenau, licensed CC BY-SA 4.0.