As we know, Switzerland has gained a reputation for being neutral in the major conflicts of the modern era. How would we make it so that it doesn't go neutral?
Hitler suffers a stroke and orders the invasion of Switzerland. Neutrality terminated.
Oh wait, this is before 1900. Have Switzerland become a fundamentalist Zwinglist Protestant nation that regularly gets into wars against the Lutherans, Catholics, and Calvinists.
Since Neutrality came about from the Napoleonic wars, you'd need to have a) nobody accepts to recognize Swiss neutrality between 1800 and 1815 and b) people stop treating Switzerland as the carpet of the Alps because given everyone and their grandmother routinely kicked their ass, if swiss is not recognized as neutral OTL, its chances of survival at Vienna drop to 0: Vaud, Genève and Valais becomes Sardinian, Neuchatel is Prussian, the rest either becomes a rump Helvetic grand duchy or kingdom or is mostly annexed by Austria (Thurgovia, Grisons, Ticino, Appenzell and Saint-Gall are, no if; some of the northern cantons might go to Baden or stick in the rump state).
Basically either the Netherlands (with reminiscences of Saxony, it was, after all, solidly on the french side) or the Italian-Republican treatment.
Heh, I'm imagining the Huguenots and French Catholics putting aside their differences just to shut those Swiss up.
Interesting; a balkanized Switzerland isn't something you see everyday.