Walls are tall and can be built in linear arrays. They can connect gatehouses and towers. From the ground, they are accessible through stairs, another gatehouse, a ladder or a siege tower. Multiple wall lines can be built next to each other, granting theoretically infinite thickness.
Foot soldiers can mount walls, who gain height advantage. Attacks coming from lower ground have a miss chance and lower damage on units in elevated positions. Braziers can also be placed on walls, which allows for the shot of fiery arrows for archers and Arabian bowmen.
Walls may be damaged by melee attacks, battering ram bashes and catapulted rocks, of which the latter causes collateral damage to adjacent structures. If a wall segment is damaged, it becomes lower in height but does not drop any units atop. Stones may fly over damaged walls or even crush units on it. They can be repaired by simply erecting a new wall line over it.
The low wall is cheaper than the average wall, but only is half height and thus withstands less punishment. Also allows the access to towers. Can be outfitted with a low-height crenulated wall.
The standard wall. Can be outfitted with a standard-height crenulated wall.
A special type of wall, which can be sited next to regular walls, granting limited personal cover in a zig-zag pattern for troops behind. The most expensive wall type.