Final answer:
The important feature of the Assyrian Empire in Mesopotamia was their use of advanced bronze weapons.
Step-by-step explanation:
One important feature of the Assyrian Empire in Mesopotamia was that its armies used advanced bronze weapons. The Assyrians were known for being the most effective military force of the ancient world up to that point. They outfitted their armies with well-made iron weapons, making them the first major kingdom to manufacture iron weapons in large numbers. Their military strength allowed them to conquer and dominate the region.