Short answers, pulled from the story.
On the 12th of April 1798, 121 cantonal deputies proclaimed the Helvetic Republic with the motto One and Indivisible. This new regime abolished cantonal sovereignty and feudal rights across Switzerland.
Peter Ochs designed the constitution of the Helvetic Republic while serving as a magistrate from Basel. It established a central two-chamber legislature including the Grand Council with eight members per canton and the Senate with four members per canton.
The Battle of Winterthur occurred on the 27th of May 1799 between elements of Army of Danube, Massena's Army of Switzerland, and Habsburg army commanded by Friedrich Freiherr von Hotze. Michel Ney deployed his force around heights called Ober-Winterthur while Hotze assembled his force into three columns marching toward Winterthur that morning.
Napoleon Bonaparte then First Consul summoned representatives both sides Paris negotiate solution the 19th of February 1803. The Act of Mediation restored cantons abolishing centralized state making Switzerland confederation once again.
Act Mediation partially restored sovereignty cantons former subject territories Aargau Thurgau Vaud Ticino became cantons equal rights. Three Leagues formerly associate not full member confederacy became full member canton Graubünden and City St Gallen along with own former subject territories those belonging Abbey Saint Gallen became full member canton St Gallen total nineteen cantons.