I have been pondering this, and i would like to raise some questions on the area of Napoleons defeat at Waterloo and some contributing factors that could of turned it the other way and seen the emperor regain control of europe..
1) What if Marshal Grouchey had finsihed off the retreating prussians and even killed Gebhard Leberecht von Blucher?
2) What if there had been no rain and the ground had not been softend?
3)What if Napoleon had won?
4) What if Wellington had not decided to fight near waterloo, but instead different location closer or further away from the french?