For 10 points, name this 1939 to 1940 war between the Soviet Union and Finland.
The proceeds from the first Washington state screening of Gone With the Wind were forwarded to civilians in this war in an initiative organized by Herbert Hoover. This war began after the attacking side shelled its own village of Mainila in a false flag operation. At the end of this war, the losing side leased the Hanko Peninsula as a naval base. The losing side of this war annihilated a much larger force with the help of (*) ski troopers at the Battle of Suomussalmi, and employed the "White Death," the most successful sniper in world history. It was followed by the Continuation War, and it began when the aggressors crossed the incomplete Mannerheim Line and entered the Isthmus of Karelia. For 10 points, name this 1939 to 1940 war between the Soviet Union and Finland.
The proceeds from the first Washington state screening of Gone
Winter War [or Talvisota; or Vinterkriget] 