Occupied Fiefs
Somehow somewhere along the way someone decided that attacking occupied fiefs isn't really attacking the occupier. That is complete rubbish. Fiefs generate gold and iron so why wouldn't the occupier take an attack upon his fief as an attack upon him/her. I mean I get the low level fiefs like a lvl 11 fief who cares about that but once you start attacking occupied fiefs over level 20 you are taking the risk that you'll come across someone like me and I will bomb the crap out of you. And not just you. Your behavior is a reflection on your league so if hostilities continue after I retaliate I'm going after your entire league. I don't care how powerful your league is I can be a major long term annoyance. Battles may be won with brute strength but wars are not.
Someone told me this was a game of war and they are right so don't think you can attack the fiefs of others and they won't retaliate. That is some kinda entitlement attitude to think that you can take away something someone else owns without paying a cost for doing so.