Cite the reasons the the winter war occured what was the major battle of the war

the under lying reason for the winter war was soviet concern about Nazi Germany's expansionism.  the secret protocol of the pact gave the soviet union a sphere of influence that included Finland, the Baltic States, and and parts of Eastern Europe.  Suomussalmi is considered the the clearest most important and most significant Finnish victory in the northern half of Finland

b.provides a written record of the transaction