Ah, okay, the bouncing your units outside of his borders does sound like a problem. The AI capitulating to another civ sounds like a smart thing for it to do, but it shouldn't delay your attacks on the vassal. IMO, what should happen is that you should automatically go to war with the new master of that civ, and your units should stay where they are. (Except for any units in the master's territory, which should get bounced because you're now at war with him too.) Also, the "you declared war on me" diplomatic penalty should be a hit on the master, not you. (I realize that humans don't get these penalty, but "you" could be another AI, since this doesn't have to happen to a human player.) So there does seem to be a problem with how the capitulations are done. That has nothing to do with the threshold, but I guess the problem is seen more often now. Thanks for the info. IMO, the fix should be to force a war with the master. If he knew a war with you was the result, he may be less willing to accept a capitulation.