Title: Troops set to evasive shouldn't attack fortifications
Summary: it doesn't make much sense to have troops who are evading combat, or attempting to, attack fortifications. As ot stands, if troops fail to evade in an enemy region with fortifications, they'll prefer to suicide against said forts. I mean, seriously, how are troops hiding behind a palisade going to spot troops sneaking by? Much less force them to attack.
Details: Either make it impossible for defenders to engage evasive troops when in a region with fortifications, or make them have to leave the fortifications to pursue. Restore common sense!
Benefits: Prevents immersion shattering nonsense battles.
Possible Downsides or Exploits: Could be used to force defenders to give up fortifications if it were decided to have defenders leave fortifications to engage the defenders. This could be countered by not having them engage if set to normal/defensive.
