I have won one domination victory using Rome and basically steamrolling the entire world on a pangea map (noble). After this I believed I was invincible and was proven wrong by Justinian sailing a fleet of galleons onto my shores and easily taking my poorly defended capital. I am not a war monger and most of my victories on Noble come from culture, diplo, or space race. However I have been very paranoid and tend to construct enormous armies of where there are at least 10 units defending even the most inconsequential cities. It get quite boring as you can imagine and I wonder whether the AI knows that I am basically an invincible fortress-- I tend to have scores of nukes and hundreds of cruise missiles. No one will dare declare war on me but I long to nuke something. So at what size do you keep your army? I want the AIs to declare war on me just for some fun, at the same time it would just be too easy to nuke any opposition into compliance. My military could easily be described as excessive.