The siege of Amida lasted eighty days, and the year A.D. 503 had commenced before it was over. Anastasius, on learning the danger of his frontier town, immediately despatched to its aid a considerable force, which he placed under four commanders--Areobindus, the grandson of the Gothic officer of the same name who distinguished himself in the Persian war of Theodosius; Celer, captain of the imperial guard; Patricius, the Phrygian; and Hypatius, one of his own nephews. The army, collectively, is said to have been more numerous than any that Rome had ever brought into the field against the Persians but it was weakened by the divided command, and it was moreover broken up into detachments which acted independently of each other. Its advent also was tardy. Not only did it arrive too late to save Amida, but it in no way interfered with the after-movements of Kobad, who, leaving a small garrison to maintain his new conquest, carried off the whole of his rich booty to his city of Nisibis, and placed the bulk of his troops in a good position upon his own frontier. When Areobindus, at the head of the first division, reached Amida and heard that the Persians had fallen back, he declined the comparatively inglorious work of a siege, and pressed forward, anxious to carry the war into Persian territory. He seems actually to have crossed the border and invaded the district of Arzanene, when news reached him that Kobad was marching upon him with all his troops, whereupon he instantly fled, and threw himself into Constantia, leaving his camp and stores to be taken by the enemy. Meanwhile another division of the Roman army, under Patrilcius and Hypatius, had followed in the steps of Areobindus, and meeting with the advance-guard of Kobad, which consisted of eight hundred Ephthalites, had destroyed it almost to a man.
Ignorant, however, of the near presence of the main Persian army, this body of troops allowed itself soon afterwards to be surprised on the banks of a stream, while some of the men were bathing and others were taking their breakfast, and was completely cut to pieces by Kobad, scarcely any but the generals escaping.