66:5.8
The purpose of an ancient city wall was to protect against ferocious beasts as well as to prevent surprise attacks by hostile humans. Those living without the walls and in the forest were dependent on tree dwellings, stone huts, and the maintenance of night fires. It was therefore very natural that these teachers should devote much time to instructing their pupils in the improvement of human dwellings. By employing improved techniques and by the use of traps, great progress was made in animal subjugation.