" The survivors of that confusion would surely be bemused by the argument that Waterloo really was not that important, that if Napoleon had won then he would have still faced overwhelming enemies and ultimate defeat. That is probably, though not certainly, true. If the Emperor had forced the ridge of Mont St Jean and driven Wellington back into a precipitate retreat, he would still have had to cope with the mighty armies of Austria and Russia that were marching towards France. Yet that did not happen. Napoleon was stopped at Waterloo, and that gives the battle its significance. It is a turning point of history, and to say history would have turned anyway is not to reduce the importance of the moment it happened. "

― Bernard Cornwell , Waterloo: The True Story of Four Days, Three Armies and Three Battles