In April 1792, Austria declared war on France, and in June 1792, the Duke of Brunswick, commander of the army of the King of Prussia, threatened to destroy Paris unless the Parisians accepted the authority of their king.[90] In response to the threat from the Prussians, on 10 August the leaders of the sans-culottes deposed the Paris city government and established their own government, the Insurrectionary Commune, in the Hôtel-de-Ville. Upon learning that a mob of sans-culottes was approaching the Tuileries Palace, the royal family took refuge at the nearby Assembly. In the attack of the Tuileries Palace, the mob killed the last defenders of the king, his Swiss Guards, then ransacked the palace.