Walls

Boyd’s Bible Dictionary:

(palisades). Solid walls limitedly used in Oriental countries for ordinary dwellings, but at times solidly laid and strongly built for palaces and temples, and as a protection to cities. They were of various materials, palisades, clay, cemented pebbles, brick and stone. Houses were frequently erected on the walls of cities, and towers for archers and slingers (Josh. 2:15; Psa. 62:3; Isa. 30:13; Luke 6:48).