[cyborg5]

well, first off, I think every kingdom needs walls and a gate around it's base, and people from other kingdoms can attack the walls with picks for a while to create a crack in the wall, once therew is a crack a sapper can place a bomb and breach the wall!
also, kingdoms should have a way of moving their base without submitting levels, like several members of ther kingdom pick the walls apart and transport bircks to new location in covered wagons, or ships, or whatever,
and to go with the sapper idea there would need to be speciel members in each kingdom that can rebuild the walls!