re: Why didn't Germany invade Switzerland?

Theres a reason popes bodyguards are Swiss, just because they like to be neutral doesn't mean they frick around. They have a very American-esque approach to guns compared to the rest of Europe. The Alps protect them in the same way a castle wall would and every entry into their small country is rigged with explosives, the Nazi's probably thought that invading Switzerland would take far more resources than it was worth.