La Belle Alliance The Battle of Waterloo The Battle of Waterloo, fought on 18 June 1815, was Napoleon Bonaparte's last battle. His defeat put a final end to his rule as Emperor of France. While the campaign hung in the balance for most of its duration, the decisive battle became the Battle of Waterloo. Allied forces, under Wellington, withstood a final French attack, and counter-attacked while the Prussians, arriving in force, broke through on Napoleon's right flank. Included in the Napoleon's Last Battles Quadrigame. Also sold as an individual folio game. Folio version includes rules, a 17" x 22" map and 100 counters.