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Events leading to the abolition of the monarchy on 10 August 1792

Leopold's and Francis II's strong action on behalf of Marie Antoinette led to France's declaration of war on Austria on 20 April 1792. This resulted in the Queen being viewed as an enemy, although she was personally against Austrian claims to French territories on European soil. That summer, the situation was compounded by multiple defeats of the French Revolutionary Army by the Austrians, in part because Marie Antoinette passed on military secrets to them. In addition, at the insistence of his wife, Louis XVI vetoed several measures that would have further restricted his power, earning the royal couple the nicknames "Monsieur Veto" and "Madame Veto", nicknames then prominently featured in different contexts, including La Carmagnole.

Barnave remained the most important advisor and supporter of the Queen, who was willing to work with him as long as he met her demands, which he did to a large extent. Barnave and the moderates comprised about 260 lawmakers in the new Legislative Assembly; the radicals numbered around 136, and the rest around 350. Initially, the majority was with Barnave, but the Queen's policies led to the radicalization of the Assembly and the moderates lost control of the legislative process. The moderate government collapsed in April 1792 to be replaced by a radical majority headed by the Girondins. The Assembly then passed a series of laws concerning the Church, the aristocracy and the formation of new National Guard units; all were vetoed by Louis XVI. While Barnave's faction had dropped to 120 members, the new Girondin majority controlled the legislative assembly with 330 members. The two strongest members of that government were Jean Marie Roland, who was minister of interior, and General Charles François Dumouriez, the minister of foreign affairs. Dumouriez sympathized with the royal couple and wanted to save them but he was rebuffed by the Queen.

Marie Antoinette's actions in refusing to collaborate with the Girondins, in power between April and June 1792, led them to denounce the treason of the Austrian comity, a direct allusion to the Queen. After Madame Roland sent a letter to the King denouncing the Queen's role in these matters, urged by the Queen, Louis XVI disbanded the government, thus losing his majority in the Assembly. Dumouriez resigned and refused a post in any new government. At this point, the tide against royal authority intensified in the population and political parties, while Marie Antoinette encouraged the King to veto the new laws voted by the Legislative Assembly in 1792. In August 1791, the Declaration of Pillnitz threatened an invasion of France. This led in turn to a French declaration of war in April 1792, which led to the French Revolutionary Wars and to the events of August 1792, which ended the monarchy.

On 20 June 1792, "a mob of terrifying aspect" broke into the Tuileries, made the King wear the bonnet rouge (red Phrygian cap) to show his loyalty to the Revolution, insulted Marie Antoinette, accusing her of betraying France, and threatened her life. In consequence, the Queen asked Fersen to urge the foreign powers to carry out their plans to invade France and to issue a manifesto in which they threatened to destroy Paris if anything happened to the royal family. The Brunswick Manifesto, issued on 25 July 1792, triggered the Insurrection of 10 August when the approach of an armed mob on its way to the Tuileries Palace forced the royal family to seek refuge at the Legislative Assembly. Ninety minutes later, the palace was invaded by the mob, who massacred the Swiss Guards. On 13 August the royal family was imprisoned in the tower of the Temple in the Marais under conditions considerably harsher than those of their previous confinement in the Tuileries.

A week later, several of the royal family's attendants, among them the Princesse de Lamballe, were taken for interrogation by the Paris Commune. Transferred to the La Force Prison, after a rapid judgment, Marie Louise de Lamballe was savagely killed on 3 September. Her head was affixed on a pike and paraded through the city to the Temple for the Queen to see. Marie Antoinette was prevented from seeing it, but fainted upon learning of it.

On 21 September 1792, France was declared a republic, the monarchy was abolished and the National Convention became the governing body of the French First Republic. The royal family name was downgraded to the non-royal " Capets ". Preparations began for the trial of the former king in a court of law.