All these cities were fenced with high walls, gates, and bars; beside unwalled towns a great many.
Deuteronomy 1:28
Whither shall we go up? our brethren have discouraged our heart, saying, The people is greater and taller than we; the cities are great and walled up to heaven; and moreover we have seen the sons of the Anakims there.
Numbers 13:28
Nevertheless the people be strong that dwell in the land, and the cities are walled, and very great: and moreover we saw the children of Anak there.
Hebrews 11:30
By faith the walls of Jericho fell down, after they were compassed about seven days.