Which is why I'm suggesting a completely different system. It's IMHO a bit silly having a bunch of kings running around whacking each other. On the other hand, we should have armies. So I'm suggesting get rid of the axe-sword-chainmail system and go instead with a basic scissors-paper-rock combat system.
Say we have archers-infantry-cavalry. We can get more complicated. My original write-up had blackpowder, artillery, differences between light cavalry and knights etc. but for now let's keep it simple.
An "army" can be made up of one troop type, infantry, archers or cavalry. This army is trained in any territory where you own a castle. (One thing I'd suggest is a considerably larger map coincidentally.) Following the scissors-paper-rock logic, archers beat infantry, infantry (think pikes) beat cavalry and cavalry beat archers. (Let's just forget Crecy, Agincourt etc.
) If two armies of the same type come up against each other, both would retreat to a free adjacent square. If unable to do so, the army is destroyed. You'd be allowed more than one army, but that's ok because we'd have a GM who can keep track of it all. Armies would be expensive to prevent it from getting overboard.
In addition to this, all troop movements would be submitted to the GM through PM. One can post troop movements on the thread, and keep them public. This would be the honourable thing to do. However, you could feed false information too. This would mean that other kingdoms can initiate spying and such. Anyway, these two suggestions I feel would bring back the feel of the old King of the Hill.
I have more but I'm in a hurry at the moment.
Cheers,