An interesting postion and replies. In summary three strats to deal with them for the inevitable war coming.

1. Take France as per Servius, simplest and most direct but probably not the most fun, I prefer the cat playing with the mouse strats below,

2. Devastate France economically, as per Roland, not bad but perhaps a trifle un-aesthetic.

3. Have a strong enough navy to avoid trade blockades, then dismantle the OS French empire piece by piece till they beg for mercy( well I can only hope for that). I'd usually do this.