The Battle of Waterloo. A decisive battle that ended the Napoleonic War. One of the main reasons Napoleon lost was because General Rey had insufficient troops to attack the British army. If Napoleon, considering Wellington a greater threat than the Prussians, freed up some troops, Wellington would be killed and the Prussians would be dealt with. Although the French would inevitably lose the Napoleonic Wars, he would remain on the throne and the instability in France after his death would have never happened because of a Napoleonic Waterloo. The world would never be the same.