CavalryCmdrThe AI behaves differently toward the Slave faction then other factions, any invade type toward the Slave faction will result in attacking as soon as they think they are strong enough. That said, Invade buildup is an agresive stance, and even on buildup the AI will attack other AI factions if they are overwhelmingly powerful. Much like invade immediate will build up thier forces if they are weaker then thier target. Unfortunately the AI will also have a tendency to lauch raid type attacks while on buildup if they do not have more pressing concerns. The best patrol-type defence I've found is invade none, defend deep toward neighbours and invade start, defend raids toward non neighbours. Problem here is they have a tendancy to not intercept invading armies, however they will concentrate more on building thier infrastucture while still recruiting a reasonable amount of troops.
The ai_db.xml only gives the AI a general 'stance' toward other factions, it dose not actually control the AI, so any invade type besides none is an agresive stance and can result in the AI attacking that faction. This is where manipulation of invade priority is very helpful, the AI will not invade a faction that has a much lower invade priority then another faction. For example if the ai_db gives an invade priority of 1000 toward slaves and only gets up to 400 toward everyone elts they will not attack unless invade_opportunistic is used, even if the only slave setlements left are the ones in america.
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