Answer :

The batle of Waterloo. It was the last battle of his 100 days after running away from Elba island
It was the Battle of Waterloo, at Waterloo (In Belgium) in which Napolean was against the Duke of Wellington for the first part (We were outnumbered during this part), and then the Prussian army came to back up Wellington, meaning we outnumbered them, and won

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