I don't believe there is a way to watch AI to AI combat. (At least, I've never figured it out.) It isn't really much of a big deal though, in my opinion... most of the time it's fairly easy to work out what went on where anyway. You're probably just not playing the game in the right way to encourage wars. There are many things you can do to "fix" this without bothering with Aggressive AI. A few suggestions: - Knock up the difficulty level. Noble is the minimum for decent AI, and if you want some serious competition and aggressiveness then you'll need to notch it up even further. - Crowd the maps a bit more. If you're playing in wide open spaces with plenty of room, nobody's going to feel much of a need for declaring war on one another. - Play with leaders like Montezuma and Alexander. If they don't declare war on anyone during the course of a game, I'd be very surprised. - Keep up your military. In Civ3, it was very easy to maintain a minimalistic military while holding the AI at bay. In Civ4, that is no longer the case - if your military is significantly weaker than another civ, they'll notice you right away, and will instantly start picking on you - demanding this and that. A few turns of keeping that up and they'll eventually just take advantage and declare war anyway. (Sometimes you won't even get the warning demands first.) - Finally, every game is different. Some seem to naturally lead to peaceful ways between most of the civs, while others end up as massive dogpiles and greedy domination. Don't think that Civ4 is "all peace" just because you've had one or two such experiences.