The War of the First Coalition is the traditional name of the wars that several European powers fought between 1792 and 1797 against the French First Republic. Despite the collective strength of these nations compared with France, they were not really allied and fought without much apparent coordination or agreement. Each power had its eye on a different part of France it wanted to appropriate after a French defeat, which never occurred.
France declared war on the Habsburg Monarchy on 20 April 1792. In July 1792, an army under the Duke of Brunswick and composed mostly of Prussians joined the Austrian side and invaded France, only to be rebuffed at the Battle of Valmy in September.
Subsequently these powers made several invasions of France by land and sea, with Prussia and Austria attacking from the Austrian Netherlands and the Rhine, and the Kingdom of Great Britain supporting revolts in provincial France and laying siege to Toulon in October 1793. France suffered reverses and internal strife and responded with draconian measures. The Committee of Public Safety formed and the levée en masse drafted all potential soldiers aged 18 to 25.