Battle of Adrianople
1829 CE.
Shown on the map at 41.673°, 26.574°.
The Battle of Adrianople was one of the final battles of the Russo-Turkish War of 1828-1829 and resulted in the Treaty of Adrianople (1829), which ended that conflict.
Text from the Wikipedia article Battle of Adrianople (1829), licensed CC BY-SA 4.0.