A Frozen Hell: The Battle of Tolvajärvi, Russo-Finnish War, 1939: In late 1939, the Soviet Union invaded Finland precipitating the Winter War. Vastly outnumbered, high quality Finnish troops fought the Red Army to a standstill. Here, at Tolvajärvi, you can see the inner workings of these battles in the snow. In and around these frozen lakes, you can take on a larger but ponderous force."