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				 Re: Besieging Forts - Reduction/Repair Formulas 
 The manual claims there is a defense penalty for being an animal.  The manual is lying.  Note, AFAIK black hawks penalty is only offensive (since they seem to make exceptional defenders).
 Mindless units also theoretically have a defense penalty, and people seem to assume this one is true.  (Notably, most undead hordes).  Have not tested.
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