Originally Posted by Philippe
If I could wave my magic wand I would create three classes of fortifications: temporary camps, wooden towers, and stone towers. The temporary camp would be much cheaper but much more ephemeral that the present fort (when the army building it leaves, it goes poof). Wooden towers could probably work like current forts, but would have much better defenses and very limited garrison capabilty. Stone towers would be like wooden towers, but even more expensive and permanent.