Louis XVI and the Legislative Assembly in the context of French Constitution of 1791

The War of the First Coalition (French: Guerre de la première coalition) was a set of wars between a coalition of several European powers and France fought between 1792 and 1797. The coalition was only loosely allied and fought without much coordination; each power wanted to annex a different part of France should they defeat the French, something which never occurred.

Relations between the French revolutionaries and neighbouring monarchies had deteriorated following the Declaration of Pillnitz in August 1791. Eight months later, following a vote by the revolutionary-led Legislative Assembly, France declared war on Austria on 20 April 1792; Prussia, having allied with Austria in February, declared war on France in June 1792. In July 1792, an army under the Duke of Brunswick and composed mostly of Prussians joined the Austrian side and invaded France. The capture of Verdun (2 September 1792) triggered the September massacres in Paris. France counterattacked with victory at Valmy (20 September) and two days later the National Convention, which had replaced the Legislative Assembly, proclaimed the French Republic.

The Low Countries theatre of the War of the First Coalition, also known as the Flanders campaign, was a series of campaigns in the Low Countries conducted from 20 April 1792 to 7 June 1795 during the first years of the War of the First Coalition. As the French Revolution radicalised, the revolutionary National Convention and its predecessors broke the Catholic Church's power (1790), abolished the monarchy (1792) and even executed the deposed king Louis XVI (1793), vying to spread the Revolution beyond the new French Republic's borders, by violent means if necessary. The First Coalition, an alliance of reactionary states representing the Ancien Régime in Central and Western Europe – Habsburg Austria (including the Southern Netherlands), Prussia, Great Britain, the Dutch Republic (the Northern Netherlands), Hanover and Hesse-Kassel – mobilised military forces along all the French frontiers, threatening to invade Revolutionary France and violently restore the monarchy. The subsequent combat operations along the French borders with the Low Countries and Germany became the primary theatre of the War of the First Coalition until March 1796, when Napoleon took over French command on the Italian front.

The April–June 1792 French incursions into the Austrian Netherlands were a disaster, eventually leading frustrated radical revolutionaries to depose the king in August. An unexpected French success in the Battle of Jemappes in November 1792 was followed by a major Coalition victory at Neerwinden in March 1793. After this initial stage, the largest of these forces assembled on the Franco-Flemish border. In this theatre a combined army of Anglo-Hanoverian, Dutch, Hessian, Imperial Austrian and (south of the river Sambre) Prussian troops faced the republican Armée du Nord, and (further to the south) two smaller forces, the Armée des Ardennes and the Armée de la Moselle. The Allies enjoyed several early victories, but were unable to advance beyond the French border fortresses. Coalition forces were eventually forced to withdraw by a series of French counter-offensives, and the May 1794 Austrian decision to redeploy any troops in Poland.

The Demonstration of 20 June 1792 (French: Journée du 20 juin 1792) was the last bloodless attempt made by the revolutionaries of Paris to persuade King Louis XVI of France to abandon his current policy and adopt a more compliant role in the escalating frenzy of the French Revolution. The demonstrators' stated aims were to persuade the king to enforce the Legislative Assembly's rulings, defend France against foreign invasion, and conform to the French Constitution of 1791. In particular, the demonstrators hoped that the king would withdraw his veto and recall the Girondin ministers.

The Demonstration was the last phase of the unsuccessful attempt to establish a constitutional monarchy in France. After the Insurrection of 10 August 1792, the monarchy was deposed. Soon after, Louis XVI was beheaded by guillotine.