>>279790305
Kinda. There was indeed a movement by rebellous cantons to overthrow the influence of the habsburg and for the right to self-govern (meaning, they don't have to pay taxes to any Emperor of the Holy Roman Empire), which would lead to the formation of the swiss confederacy.
It would lead to a very famous battle, where the rebellous mountain peasants (plus their mercenaries) would triumph over the much larger knight army of the habsburgians.
As far as I can tell, the manga series is taking that feud as the basis of the story.