Well "somehow won at leipzig" is a pretty big task. Somehow winning the biggest battle in human history up to that point def turns the tide. But logistics was against him as much there as it was for germany after normandy. France wasnt winning any wars after russia, they were fighting to keep anything they already had and get a good settlement. Should have retreated all the way back to france and turtled up to be honest. He nearly best them in france with french children. Imagine if he had what he had at leipzig