If we (Canada) invaded France, we'd get our butts whooped hard. They have better equipment, more troops, home-field advantage.
If France invaded Canada, I'm figuring a stalemate. We have so much room to maneuver and basically engage in guerrila-style warfare in the wilderness, not to mention a huge number of trained recreational shooters that would make life hell for any invasion force. That's if the US didn't get involved, in which case the North American units would smash the Frenchies into tiny itty little bits.