The famous military leader at the Battle of Waterloo was Duke of Wellington, Arthur Wellesley. He commanded the Anglo-allied forces against Napoleon Bonaparte’s French army on June 18, 1815. This decisive battle took place near Waterloo in present-day Belgium and marked the end of the Napoleonic Wars. The Duke’s strategic leadership and ability to unite various Allied forces were crucial to his victory. Napoleon's defeat at Waterloo led to his exile to Saint Helena and a significant shift in the balance of power in Europe, establishing a period of peace known as the Congress of Vienna.