The Insurrection of 10 August 1792 was a defining event of the French Revolution, when armed revolutionaries in Paris, increasingly in conflict with the French monarchy, stormed the Tuileries Palace. The conflict led France to abolish the monarchy and establish a republic. Conflict between King Louis XVI of France and the country's new revolutionary Legislative Assembly increased through the spring and summer of 1792 as Louis vetoed radical measures voted upon by the Assembly. Tensions accelerated dramatically on August 1 when news reached Paris that the commander of the allied Prussian and Austrian armies had issued the Brunswick Manifesto, threatening "unforgettable vengeance" on Paris should harm be done to the French Monarchy. On August 10th, the National Guard of the Paris Commune and fédérés from Marseille and Brittany stormed the King's residence in the Tuileries Palace in Paris, which was defended by the Swiss Guards. Hundreds of Swiss guardsmen and 400 revolutionaries were killed in the battle, and Louis and the royal family took shelter with the Legislative Assembly. The formal end of the monarchy occurred six weeks later on September 21st as one of the first acts of the new National Convention, which established a Republic on the next day.