The military leader known for his mastery of strategy during the Napoleonic Wars is Duke of Wellington, Arthur Wellesley. He is best recognized for his pivotal role in leading the British forces to victory against Napoleon Bonaparte at the Battle of Waterloo in 1815. Wellington’s strategic skills, particularly his ability to effectively coordinate and position troops, were instrumental in defeating Napoleon's army. His victory marked the end of the Napoleonic Wars and led to significant changes in European power dynamics. Wellington went on to serve as a statesman, eventually becoming the Prime Minister of the United Kingdom.