Like the idea. Had some quick thoughts about it:
Sieging a castle would lock it down so noone can get in or out.
With the new building system
Castles could get the option to build up stuff like:
-Dig out wells: increases siege suppply by x days
-Stock up food:increases siege supply by x days
-Hidden side gate: reduces the % of siege-army you have to fight in a sally out.
-etc.
If the
supplys of a castle run out it looses x% troops per x houres.
Castle gets the opinion to
sally out: The army of the Castle attacks a certain % of the siege-army.
Sending a
relief force: If a army attacks the siegeing army the castle' troops have the option to join in and support attackers in the attempt to free the castle.
Attackers would get x% increased upkeep for every x houres the siege goes on and have the option to initiate attacks as they wish.
Maybe even the option to
build siege equipment while they siege so they can use those in attacks (?).
I think this would make it harder for people to hold castles since they would have to have troops outside a castle in case of a siege ( or allys that send backup etc.).
Makes sence to me since holding a castle atm is just like holding a village only with a bigger wall around it.
So holding a castle with a system like thsi would actually give you a certain need to have some power for backup.
Edit: Additional ideas:
Attackers decide who leaves the castleAlso, what about letting the attackers choose if they want to let certain person out of the castle? I mean, if the castle is under siege, and someone wants to leave, the defenders see what he has and then decide, can leave, or not.