@Imperious:
Its not just for france its for any 2 allies combining up the turns (combat movement) it can be anywhere one event per game.
Now that would be a HUGE surprise!!
I recall hearing about some Cammander-in-Chief rules from the Original Nova version of Axis & Allies. Maybe Larry might be bringing them back :-)
If such a Combined Attack were to be incorporated, I would think you would need several limitations to keep it balanced:
-one-time use only
-only one territory can be targeted
-no unit will be able to move twice in that round
-defender must be given some sort of warning the attack will be happening (consider it as intelligence). I would think something along the lines that if the Combined attack is going to occur on say US turn 5, the Allies would have to declare a Combined attack will be happening next round at the end of US turn 4 (but without any declaration of where and with what units). This would give the opponent sometime to prepare.
I could see the rule being used in a lot of theatres and potentially blowing the game wide open (ie. totally changing the momentum in a theater) with a well-orchestrated attack…
UK/US vs. France
Ger/Ita vs. Atlantic Fleet, Russia, or Africa
Allies vs. Japan in SE Asia, or Pacific
The biggest worry though, would be balance… I’d be most concerned about Axis navies. Again though, the rule would just require some restrictions to keep it balanced.
P.S. I doubt we’ll see this as a surprise for the new game… but it would be cool :-D