Need some tips here... I need to conquer a city with a defense of 144. It contains every defensive perk there is (wall, general, modern infantry with upgrades of engineer, loyalty, etc.). I've go a fleet of Battleships right next to it and I send in spies to disable defense but it still shows up as a defense of 144. I'm attacking with Veteran Bomber wings, which to my knowledge is the strongest offensive unit and though I can't remember exactly, I'm only getting an attack of approx 108. What else can I do here? I want to win by Domination even though I've had the means to win a Cultural or Economic victory for a while now.