How was the Shamash Gate at Nineveh protected from attackers?

The Shamash Gate at Nineveh was heavily fortified to protect the city from attackers. The approach to the gate was secured by two moats and a watercourse, which were crossed by a series of bridges featuring arches cut from natural conglomerate.1

The gate structure itself was built using mud and burnt bricks and was faced with limestone. It featured a crenellated parapet that shielded a defense causeway. The gate's primary entrance was located in the center of a long, projecting bastion, which was further reinforced by six towers. Internally, the gate included six large chambers lined with orthostats.1