The significant battle that marked the end of Napoleon Bonaparte's rule in 1815 is the Battle of Waterloo. Fought on June 18, 1815, it saw British-led allied forces, under the command of the Duke of Wellington, confront Napoleon's army. The battle resulted in a decisive defeat for Napoleon, leading to his abdication and subsequent exile to Saint Helena. This battle is considered pivotal as it effectively concluded the Napoleonic Wars, restored the Bourbon monarchy in France, and reshaped the political landscape of Europe for years to come.