In April 1798, French revolutionary troops annexed Geneva. French control and occupation lasted over 15 years until the defeat of France in the Napoleonic Wars. On December 31st 1813, the last French troops left Geneva and the Restoration of the Republic of Geneva was declared.
Shortly after, on June 1st 1814, Geneva was admitted to the Swiss Confederation.
To mark the anniversary of the restoration, cannons are fired at 8 am on December 31st from the Promenade de la Treille. This is followed by an official governmental ceremony and a memorial service at the Cathedrale Saint-Pierre, and a concert in the cathedral.