
Originally Posted by
Asai Nagamasa
As far as I know improvements have no bearing on the losses incurred during a siege. On the campaign map, the difference between castles is garrison size. Upgrades are the same as castles, it's difficult to explain unless you've been involved in modding, but the Fort is referred to internally as "CASTLE". All upgrades (including whole new castles such as the Keep, Castle, Citadel and Fortress) are referred to as "CASTLE2", "CASTLE3", "CASTLE4". When you build a Fort (CASTLE) you have the option to upgrade to "CASTLE2" followed by "CASTLE3" (Upgrades) or you can jump to "CASTLE4" (the Keep). This is a simple matter of building dependencies. To summarise, all "Castles" and their upgrades are actually Castles. There is no difference. What gives the illusion of the upgrades is the "jumps" i.e. from CASTLE to CASTLE4 to CASTLE7 etc.