I have seen in many posts that you need to keep an good defense in your border cities to deter the AI. I have not moved up in difficulty yet, so I typically have little problems with only one defender in my border cities. On the Terra map, I have more problems from the barbarians in the New World so i will defend my settlements better there. 1. Could people post, stating their difficultly level, what they consider a good defense in border cities? 2. On the flip side of that, do you have minimal defenses (obsolete units perhaps) in the core cities away from the border? I want to move up in level, but I don't want to get wiped out early since I am used to weaker defenses in my cities.