[GoZelda]

A few improvements should be made to the castles:

Gates
Gates should be open-able by kingdom members, so multiple allies can pass trough. It should also be destroyable by siege weapons, so it'll be possible to take over a castle.

Ports
Ports should be little doors in the wall trough which kingdom allies/members can pass trough every minute. It can be taken over by an enemy, but will not be a terrible threat since someone can only pass trough every minute.

Kingdom inside
It should be possible for anyone to acces the inside of a castle, so the war can be continued there. It's pretty dumb you can't get in there now.