Battle of Mont-Saint-Jean, known as Waterloo, 18 June 1815, (c1850). The Battle of Waterloo was fought near Waterloo in present-day Belgium, then part of the United Kingdom of the Netherlands. A French army under the command of Emperor Napoleon Bonaparte was defeated by two of the armies of the Seventh Coalition: a British-led Allied army under the command of the Duke of Wellington, and a Prussian army under the command of Gebhard Leberecht von Bl?cher, Prince of Wahlstatt. The battle marked the end of the Napoleonic Wars. Print from a series depicting the campaigns of Napoleon I, published c1850.