Goto Google and type in "French military victories", then hit "I'm feeling lucky".
Sort of been done before in a different event many years ago. Basically we had a whole team that developed a campaign where if this side one this frame then it would lead to this frame and so on. It was a lot more administrative overhead and required a whole separate team to manage .. i.e. what if battle of Britain lost? What if Invasion of Normandy failed? Or Germans won battle of Bulge.
Was it successful? If so, I'd like to see it redone.