I may have a solution for you. I'm 99% sure that I can write an event that forces the human player to unload units either into a city or from a transport that has full movement points if onto a beach. (I've tried similar things for Over the Reich, which may or may not be kept.) So, scrap the kill driven Maritime Supremacy system, and allow the French to build transports from an early stage. Since the first part of the invasion must take place on a beach, the full transports must be exposed to English attack before they can be unloaded. If the French have not adequately thinned out the Royal Navy, then the transports are in serious trouble. I would also write move unit events that direct nearby English warships to attack tiles with loaded transports, in order to help the AI be dangerous, and events to make the English try to keep "enough" warships in the Channel to challenge the French fleet. Perhaps add a delay for reinforcements after new French construction or victories ("Alarmed by recent losses at sea against the French, the British Admiralty recalls ships deployed outside of Europe. It will take some time for these ships to arrive."), so not only may a victory happen at an unpredictable time, there will be a limited window of opportunity to exploit it, so the troops must be kept near the shore, and not guarding against the Austrians or Prussians. Even if this works, there is still a problem that a successful invasion of England seems like it would decide the game in ~1808. Maybe it doesn't, and only just seems like it since I haven't played through the game. For all I know, leaving England free or not might be mostly inconsequential compared to the combined might of Russia, Austria, and Prussia. EDIT: I wasn't meaning to assert that he did sacrifice allies over Frenchmen (I don't know enough about that either way), just that it would not be surprising if he did.