Fortress, I wanted the battle to be horribly lopsided, hence the 15 aa guns. wink
Besides, my rule of thumb has always been, and will always be, attack with 3x what the defender has. Well, or MAJOR engagements such as attacking a lone battleship I would use 4-6 aircraft so it only gets the one shot off. Hitting a single defender, 2 inf/fig if I wanted the land, inf/fig if I just wanted to kill the defender.
AA Guns toss that last one outta whack. What do you do when you have Moscow and Germany/Japan/Italy has you surrounded with 3 infantry/AA Gun in each territory? This is why I like the AA Gun rules now…they migrate forward and really complicate things. It should be rare that more than one aa gun gets attacked, in my opinion. Except for Sea Lion, and maybe the invasion of W. Germany (and Moscow, but max there is 3 AA Guns) the odds of facing a shear mass of AA Gun fire should be over.