The battle of Waterloo changed the future of Europe and sealed Napoleon's fate. But why did such a successful and experienced commander as Napoleon lose that battle, 200 years ago today?

Historian Andrew Roberts describes Napoleon's uncharacteristic catalogue of errors, the poor communications on the battlefield and the Emperor's miscalculation about the vital part that would be played by the Prussians, fighting on the Allied side.

Simon Russell Beale is the voice of Napoleon.

Produced by Victoria Ferran and Susan Marling