Wellington.
Field Marshall Sir Arthur Wellesly, Duke of Wellington, led the British forces opposed to the French armies commanded by Napoleon Bonaparte, "Emperor" of France.
It was his downfall. After the battle he was exiled on an island once again until his death.
gravity
To this day, historians argue over what caused the Roman empire's downfall.
What caused the downfall of the Shang Dynasty was that Shang Zhou's army was defeated by the Zhou people at the Battle of Muye.
Lack of food
Died of a stroke
Lack of food
Muslim destroyed them
Nothing caused Trajan's downfall. His reign ended when he died. He was ill in the last few months of his life and died of oedema.
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Domitian was murdered in a palace conspiracy by court officials.
Anti-protestantism contributed a lot to Louis' downfall because it caused them to not agree with him on many issues ;)