Just saw a documentary on HIST CHANNEL last night in the Secret Passages series, which was all about secret tunnels of WWII, including with the very elaborate underground passages set up by the Swiss to resist a possible Nazi invasion. Now, what would've been the outcome of Hitler deciding to invade Switzerland at some point after July-Sept 1940 ? Given the immense strengths of the Swiss fixed defences in the Alps, the large nos. of Swiss soldiers and reservists who would've waged a partisan war against the invaders for every inch of Swiss territory, the respectable Swiss arms industry and the very rugged terrain of the country itself which would've seriously hindered the execution of blitzkrieg tactics, would the Germans have been given a very bloody nose if Hitler had decided to invade Switzerland ?