Category: History / European History Details: Words: 1297 | Pages: 5.5 (approximately 235 words/page) Essay - Why did France declare War on Austria in 1792? In April 1792, the French Legislative Assembly declared war against the King of Hungary and Bohemia, for plotting aggression. They declared war in the name of the French nation in defence of liberty; it began the first 'War of the People's' in the Modern world. Only 7 deputies voted against the war, which was thought by the majority to be in France's best interests. The conflict lasted nine years and France lost 1.