In April 1792, France had declared war on the “King of Hungary and Bohemia,” that is the House of Austria or Hapsburg, which, since it possessed most of Belgium, was the most important of the powers that adjoined the French frontiers. By the following summer the French were also at war with the kingdoms of Prussia and Sardinia, and by 1793 with Great Britain, the Dutch Republic, and the Bourbon Monarchy of Spain. Despite occasional appearances, or stated war aims, the war that began in April 1792 became an ideological conflict between new and old—between “democratic” and “aristocratic” forms of society in the sense explained in the preceding volume. This chapter focuses on this complex story and nations involved. It begins with a tale of two cities, involving ceremonial events in Frankfurt and Paris on July 14, 1792. It was, of course, Bastille Day, but it was also the date of the imperial coronation of Francis II, a young man of twenty-four who proved to be the last Holy Roman Emperor.