In November 7th 1918 Kurt Eisner (a social democrat) declare Bavaria a Socialist republic. After he lost local elections he decided to step down on February 21st 1919, however he was shot on his way to parliament. After some confusion the communists and anarchists seized power in Bavaria and announced an independent Soviet Republic on April 6th 1919. However on May 1919, loyal elements of the German Army and Marinebrigade Ehrhardt defeated the communists and recaptured Munich after bitter fights on the streets.
The challenge is to make the Bavarian Soviet Republic survive, and become a part of post WW1 Europe.