I don't think this is an expliot as I've never seen the AI factions make a fort let alone a fort in a economically strategic location!!
I think this gives the game a new angle, forts should be used a lot more and now they have worth for the expense. My forts (when I bother to make one) have been attacked, when in a militarilly strategic location. You would have to plan your campaigns around going through certain bottlenecks or take out forts causing them.
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