Why did the Duke of Wellington defeat Napoleon?

Answer 1

a) by constantly defeating French armies in Spain, draining the resources of the Empire which would have been useful elsewhere.

b) by winning at Waterloo and finally seeing Napoleon off to St. Helena.

Answer 2

There is a mistake in your question:

Both Duke of Wellington and Admiral Nelson were English, and neither one defeated the other!

But both of them are famous for defeating Napoleon at the Battle of Trafalgar in 1805 and Battle of Waterloo in 1815.

Admiral Nelson was killed in Trafalgar, but he still managed to defeat French Admiral Villeneuve who was in charge of the Franco-Spanish fleet that was based in Cadiz.

Nelson won thanks to his naval skills and naval supremacy. Although the French fleet had more vessels, quite a number of them didn't participate in the battle.

Napoleon was defeated by Wellington because he failed to receive reinforcements from his officer Crouchy, who could have cleared the French army away by attacking the flanks of the Allies.

Answer 3

Because he was British and a better strategist and soldier than Napoleon. The duke which then was know as Wesseley knew that napoleons cavalry played a major role in battles, so he Waited for Napoleons cavalry to come to flank his regiments, then flanked his Calvary thus surrounding the Napoleonic army.

Or:

Napoleon's Army was essentially untrained. The troops were armed with muskets while Wellington had many units armed with the longer ranged and more accurate rifle. The UK soldier was highly trained, and stood his ground in every engagement. He was resolute and determined. He would not yield an inch to the French Army.