This was Von Oben's terrific project to simulate the struggle between Finland (and its German ally) and the Soviet Union, that war within a war that is too often forgotten:
There are three campaigns in this theatre:
The Winter War: November 30, 1939 - March 13, 1940
The Continuation War: June 25, 1941 - May 8, 1944.
The Summer 1944 Soviet offensive: May 14, 1944 - September 4, 1944.
Credit to those who worked with Von Oben: Edward, FreddyB, Illu, Knegel, Knug, and Neira, and again to Mr. Jelly who packaged it for 1.6.