A Balkan CF is when a series of war declarations by minor powers in the Balkan areas causes the war to go non-historical. These war declarations are caused a web of independence guarantees in that area.
How to avoid this:
- The guarantees will expire at new year 1940, so stay out of the area until then.
- The Italy AI will become aggressive in Balkans when Paris falls, so German players should wait with invading France until 1940.