[DiogenesLamp]

Not only did Switzerland have a well-trained civilian militia, there’s also the huge problem of invading a mountainous country. By 1940, the Swiss built a very extensive system of fortifications that took full advantage of the mountainous terrain of the country and any land invasion would have resulted in massive casualties on the German side because the Swiss defender held the “high ground” in too many parts of the country.

I recall reading a conversation between Hitler and a subordinate about invading Switzerland. The Subordinate said something to the effect that "surely we can beat their army?"

To which Hitler was said to have responded, "Switzerland doesn't have an army. Switzerland IS an Army. "

[HiTech RedNeck]

Not that Switzerland was always virtuous in what they did, but being a sitting duck was not among their follies.