What was the peculiarity of the Assyrian military power?

The difference between the Assyrian military power and many other states of antiquity was that it was not agricultural, and its economy was based on trophies of war, which were brought in large quantities during the conquests of neighboring powers. An important role was also played by taxes levied on subordinate peoples and tributes from trade routes. In general, this country existed thanks to a well-established communications network and superior military power. In this connection, some researchers call Assyria the first empire.