The battle that was fought in 1815, marking the final defeat of Napoleon Bonaparte, is the Battle of Waterloo. Taking place on June 18 during the Hundred Days, this decisive engagement involved British-led Allied forces, commanded by the Duke of Wellington, confronting Napoleon’s army in present-day Belgium. Despite initial successes, Napoleon's forces were ultimately overwhelmed, leading to his surrender. The defeat at Waterloo ended his rule and resulted in his exile to Saint Helena, where he spent the remaining years of his life. This battle significantly altered the course of European history, leading to a period of relative peace and the Congress of Vienna.