Cross reference
Deuteronomy 3:5
5 All these were cities fortified with high walls, gates, and bars; besides the unwalled towns a great many.
Numbers 13:28
28 Howbeit the people that dwell in the land are strong, and the cities are fortified, `and' very great: and moreover we saw the children of Anak there.
Deuteronomy 1:28
28 Whither are we going up? our brethren have made our heart to melt, saying, The people are greater and taller than we; the cities are great and fortified up to heaven; and moreover we have seen the sons of the Anakim there.
Hebrews 11:30
30 By faith the walls of Jericho fell down, after they had been compassed about for seven days.