Battle of Taipale
1939 CE.
Shown on the map at 60.507°, 29.012°.
The Battle of Taipale was a series of battles fought during the Winter War between Finland and Soviet Union from 6 to 27 December 1939. The battles were part of a Soviet campaign to penetrate the Finnish Mannerheim Line in the Karelian Isthmus region to open a route into southern Finland. Despite their numerical superiority, the Soviet forces were unable to break through the Finnish defences.
Text from the Wikipedia article Battle of Taipale, licensed CC BY-SA 4.0.