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Are we counting civil wars? Sonderbundskrieg in 1847.I can't name the last time Switzerland was at war. Probably just before they decided that one of those should be in every closet and everyone should know how to use it.
Except that one mainly keeps the Italians out (didn’t help so much with the Roman legions though). The Jura forms the main defensive line against France (and formerly Burgundy, when it was independent). The Rhine and Lake Constance are the principal defense against the Germans. And there are gaps. The land from Romanshorn in the east to Geneva in the west, north of the Berner Oberland, is pretty flat and accessible. Particularly to mechanized forces.And they have a formidable wall that they named The Alps.