Andrew, it might be some of the other mods you have downloaded are incompatible. It says you have Weeping Angels and Grimiore of Gaia downloaded along with da Lotr mod. I dunno, I'm not techy, just a suggestion.
How about you add Barbarians as the next level? They could have a much higher AI than the Zoblins or the Rabid Dwarves, that could be where the actual battle strategy part of the mod comes in. Barbarians could set up catapults and all sorts of siege engines to attack your fort with
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