In a Swiss church, Antonio Carrera is getting married to the pretty daughter of an Italian Mafioso, when army police officers march in and take him to the 15 week compulsory Swiss military training.
World peace is under threat - it's a good thing that instructor Schmidt exists. As a sharpshooter with a cigar, sunglasses and beret, he immediately suspects the terrorist conspiracy lurking behind the peace summit at Schwangau Castle. The aim is to unite the strife-torn Kallushistan. Princess Shirin and the pacifist recruit Rainer assist in the hunt for alleged assassins.
Film tells the story of how Switzerland came into being - albeit in a slightly different way to the historical circumstances we have known up to now: William Tell proves himself a national hero against his will in the midst of the comic chaos of court intrigues, mishaps and misguided love of country. Habsburg occupiers and Swabian tourists stand in the way of the Confederates' fight for independence, but a parodic all-round attack ensures that all patriots learn their history lesson - and in the process are relegated to their respective national borders.
