I´ve read that war between the Factions maybe will be added to the game.
So if they attack a Town, Stronghold or whatever, they could take it over. So they claim the town for they self. And the losing faction went to the desert and tries to regain an army to take it back. (just an idea).
There also must be some Siege Weapons. ( I didnt find any other thread ^^)
If someone attacks a town, he will need Siege weapons, such es, Trebuchés ( is it right?), catapults, Ballistas and so on.
But there must be some defending siege weapons. Oil, stones. something like that? Closeable town doors.
Secret passages out of Town to rescue the lords and ladys?
If something similar is already post, Im sorry. ^^