Seems defense bonuses of a Wall and a Castle don't stack: both are 50%.
Building a Wall in a city with 20% cultural defense increased defense to 50% instantly.
Building a Castle in a city bombarded to 18% increased defense to 36%.
So wall/castle is not about permanent 50% defense but about increasing cultural defense beyond low cultural levels + reduction of bombardment cultural def (8/16/12 for cata/treb/cannon).
Does reduction of bombardment cultural def stack together? Or the best of available is taken (50% wall, 25% castle) or total 75% is used?
How fast does city recover from bombardment to its cultural or 50% def level with a wall / a castle / without (per turn)?
It seems walls / castle should be built when AI reduced city def to 25% to recover it to 50% - this will delay final assault. I built walls in advance and seems it is sub-optimal...
Recent discussion: https://forums.civfanatics.com/threads/city-defense-discussion.689330/
Building a Wall in a city with 20% cultural defense increased defense to 50% instantly.
Building a Castle in a city bombarded to 18% increased defense to 36%.
So wall/castle is not about permanent 50% defense but about increasing cultural defense beyond low cultural levels + reduction of bombardment cultural def (8/16/12 for cata/treb/cannon).
Does reduction of bombardment cultural def stack together? Or the best of available is taken (50% wall, 25% castle) or total 75% is used?
How fast does city recover from bombardment to its cultural or 50% def level with a wall / a castle / without (per turn)?
It seems walls / castle should be built when AI reduced city def to 25% to recover it to 50% - this will delay final assault. I built walls in advance and seems it is sub-optimal...
Recent discussion: https://forums.civfanatics.com/threads/city-defense-discussion.689330/