Winter War was a cocky invasion of Finlandball (allied with Nazi Germanyball) by Soviet Unionball. The USSR wanted to annex Finland
just like poor Estonia. The invasion failed horribly however, as the Soviet Union suffered 3x as many casualties as the Finns. The end result was an exchange of territory where Finland gave up 12% of its land to the USSR, but the Soviets suffered a severely embarrassing moment in their history.