Ai's Military Defenses
Ai existed in a world that was sometimes rather unfriendly. Cities were attacked, conquered, and burned by invading enemies. Safety in times of danger was one of the reasons for city living.
The people of Ai built massive walls to make it easier to defend their city. These walls were over 15 feet (4 meters) high in some places. They were built of field stones, and probably had mud-brick walls built on top of them, making them even higher.