Newcastle function.

[grim2122]

I think there should be a new function, called abandon Castle. This would let you abandon your hold on a castle that you no longer wanted, making it a free castle but leaving whatever upgrades and resources it had before you abandoned it intact. Maybe have some kind of thing to noting it as a free castle once held. Something to that effect.
This would let you, if maybe you want to get rid of a few castles, do it without letting people attack you and take those castles away from you.