Battle of Varolampi Pond
1939 CE.
Shown on the map at 62.300°, 31.367°.
The Battle of Varolampi Pond also known as the 'Sausage War' occurred during the Winter War and was a precursor to the Battle of Tolvajärvi.
Text from the Wikipedia article Battle of Varolampi Pond, licensed CC BY-SA 4.0.