He had to fight. That's all he had. Not memories, not experiences, not skills. He had a will. And his will was to fight until he couldn't fight anymore.
The division of the Roman world between the sons of Theodosius marks the final establishment of the empire of the East, which, from the reign of Arcadius to the taking of Constantinople by the Turks, subsisted one thousand and fifty-eight years in a state of premature and perpetual decay.