yes, the real life background between Finnish/Soviet relations during WW2 is pretty crazy.http://en.wikipedia.org/wiki/Simo_H%C3%A4yh%C3%A4
this guy (a Finnish sniper nicknamed "the White Death" by the Soviets) is the most successful sniper in history. it is said that he killed something like 0.3% of all the Russians who died during the first year of the war on his front. he also took a bullet through the head and lived.
also, the Finns, who were outnumbered something like 3:1, and had less than 100 tanks, managed to cripple an entire Soviet armoured division and credit themselves with a 20:1 kill-death ratio per man.