Battle of Tienhaara
1944 CE.
Shown on the map at 60.745°, 28.680°.
The Battle of Tienhaara was a part of Continuation War between Finland and the Soviet Union fought north of Viipuri on June 22, 1944, after the Red Army had captured Viipuri. Having lost Viipuri, the Finns concentrated their defense to the Tienhaara region which offered favourable area for defense with nearby waterway cutting the already narrow battlefield into several islands.
Text from the Wikipedia article Battle of Tienhaara, licensed CC BY-SA 4.0.