What self-proclaimed nation declared war on Switzerland?

Question

I am talking about 20th century history.
What nation / government declared war against Switzerland, and why?

Answer 1

The Bavarian Soviet Republic, also known as the Munich Soviet Republic declared war on Switzerland over the Swiss refusal to lend 60 locomotives to the Soviet Republic. Rumors also had cables sent to both Pope Benedict XV and Vladimir Lenin, asking as to the whereabouts of the key to the lavatory. As such, the regime collapsed within six days, being replaced by the Communist Party, with Eugen Levine, sometimes characterized as a "potential German Lenin" as their leader.