The Battle of Waterloo was fought on Sunday, 18 June 1815, near Waterloo in present-day Belgium, then part of the United Kingdom of the Netherlands. An Imperial French army under the command of Emperor Napoleon was defeated by the armies of the Seventh Coalition, comprising an Anglo-allied army under the command of the Duke of Wellington combined with a Prussian army under the command of Gebhard von Blücher. It was the culminating battle of the Waterloo Campaign and Napoleon's last. The defeat at Waterloo ended his rule as Emperor of the French, marking the end of his Hundred Days return from exile. Upon Napoleon's return to power in March 1815, many states that had opposed him formed the Seventh Coalition and began to mobilise armies. Two large forces under Wellington and Blücher assembled close to the north-eastern border of France. Napoleon chose to attack in the hope of destroying them before they could join in a coordinated invasion of France with other members of the coalition. The decisive engagement of this three-day Waterloo Campaign occurred at the Battle of Waterloo. According to Wellington, the battle was "the nearest-run thing you ever saw in your life".