Why does Switzerland celebrate its national day on August 1st?

[BECKHAM]

People across Switzerland get busy brunching, lunching and setting off fireworks when the country celebrates its national day. But why is it held on August 1st and what does it commemorate?

for more... (https://www.thelocal.ch/20190801/why-the-swiss-national-day-is-celebrated-on-august-1st)