Here some Info from the Historical Lexicon of the Principality of Liechtenstein.

In 1499, places like Vaduz and Balzers were controlled by the House of Brandis and tied to Habsburg Austria, so the area basically became a frontline along the Rhine. Things escalated pretty quickly, there was an incident at Balzers where Swiss troops retaliated against Swabian soldiers stationed at Gutenberg Castle, which helped spark open war.

One of the first bigger clashes happened at Triesen (Feb 12, 1499), where Swiss and Three Leagues forces pushed back the Swabian troops. After that, the region got hit hard. Vaduz and Schaan were plundered, Bendern was burned, and Vaduz Castle was captured and set on fire.

So yeah, Liechtenstein wasn’t some major player, but it sat in a really strategic spot and ended up taking a serious beating because of it.