Rome, on her part, endeavored to retaliate (A.D. 526) by invading Persarmenia and Mesopotamia. The campaign is remarkable as that in which the greatest general of the age, the renowned and unfortunate Belisarius, first held a command and thus commenced the work of learning by experience the duties of a military leader. Hitherto a mere guardsman, and still quite a youth, trammelled moreover by association with a colleague, he did not on this occasion reap any laurels. A Persian force under two generals, Narses and Aratius, defended Persarmenia, and, engaging the Romans under Sittas and Belisarius, succeeded in defeating them. At the same time, Licelarius, a Thracian in the Roman service, made an incursion into the tract about Nisibis, grew alarmed without cause and beat a speedy retreat. Hereupon Justin recalled him as incompetent, and the further conduct of the war in Mesopotamia was entrusted to Belisarius, who took up his headquarters at Daras.
The year A.D. 527 seems to have been one in which nothing of importance was attempted on either side. At Constantinople the Emperor Justin had fallen into ill health, and, after associating his nephew Justinian on the 1st of April, had departed this life on the 1st of August. About the same time Kobad found his strength insufficient for active warfare, and put the command of his armies into the hands of his sons. The struggle continued in Lazica, but with no decisive result. At Daras, Belisarius, apparently, stood on the defensive. It was not till A.D. 528 had set in that he resumed operations in the open field, and prepared once more to measure his strength against that of Persia.
Belisarius was stirred from his repose by an order from court. Desirous of carrying further the policy of gaining ground by means of fortified posts, Justinian, who had recently restored and strengthened the frontier city of Martyropolis, on the Nymphius, sent instructions to Belisarius, early in A.D. 528, to the effect that he was to build a new fort at a place called Mindon, on the Persian border a little to the left of Nisibis. The work was commenced, but the Persians would not allow it to proceed. An army which numbered 30,000 men, commanded by Xerxes, son of Kobad, and Perozes, the Mihran, attacked the Roman workmen; and when Belisarius, reinforced by fresh troops from Syria and Phoenicia, ventured an engagement, he was completely defeated and forced to seek safety in flight. The attempted fortification was, upon this, razed to the ground; and the Mihran returned, with numerous prisoners of importance, into Persia.
It is creditable to Justinian that he did not allow the ill-success of his lieutenant to lead to his recall or disgrace. On the contrary, he chose exactly the time of his greatest depression to give him the title of “General of the East.” Belisarius upon this assembled at Daras an imposing force, composed of Romans and allies, the latter being chiefly Massagetse. The entire number amounted to 25,000 men; and with this army he would probably have assumed the offensive, had not the Persian general of the last campaign, Perozes the Mihran, again appeared in the field, at the head of 40,000 Persians and declared his intention of besieging and taking Daras. With the insolence of an Oriental he sent a message to Belisarius, requiring him to have his bath prepared for the morrow, as after taking the town he would need that kind of refreshment. Belisarius contented himself, in reply, with drawing out his troops in front of Daras in a position carefully prepared beforehand, where both his centre and his flanks would be protected by a deep ditch, outside of which there would be room to act for his cavalry. Perozes, having reconnoitred the position, hesitated to attack it without a greater advantage of numbers, and sent hastily to Nisibis for 10,000 more soldiers, while he allowed the day to pass without anything more serious than a demonstration of his calvary against the Roman left, and some insignificant single combats.
The next morning his reinforcement arrived; and after some exchange of messages with Belisarius, which led to no result, he commenced active operations. Placing his infantry in the centre, and his horse upon either wing, as the Romans had likewise done, and arranging his infantry so that one half should from time to time relieve the other, he assaulted the Roman line with a storm of darts and arrows. The Romans replied with their missile weapons; but the Persians had the advantage of numbers; they were protected by huge wattled shields; and they were more accustomed to this style of warfare than their adversaries. Still the Romans held out; but it was a relief to them when the missile weapons were exhausted on both sides, and a closer fight began along the whole line with swords and spears. After a while the Roman left was in difficulties. Here the Cadiseni (Cadusians?) under Pituazes routed their opponents, and were pursuing them hastily when the Massagetic horse, commanded by Sunicas and Aigan, and three hundred Heruli under a chief called Pharas, charged them on their right flank, and at once threw them into disorder. Three thousand fell, and the rest were driven back upon their main body, which, still continued to fight bravely. The Romans did not push their advantage, but were satisfied to reoccupy the ground from which they had been driven.
Scarcely was the battle re-established in this quarter when the Romans found themselves in still greater difficulties upon their right. Here Perozes had determined to deliver his main attack. The corps of Immortals, which he had kept in reserve, and such troops as he could spare from his centre, were secretly massed upon his own left, and charged the Roman right with such fury that it was broken and began a hasty retreat. The Persians pursued in a long column, and were carrying all before them, when once more an impetuous flank charge of the barbarian cavalry, which now formed an important element in the Roman armies, changed the face of affairs, and indeed decided the fortune of the day. The Persian column was actually cut in two by the Massagetic horse; those who had advanced the furthest were completely separated from their friends, and were at once surrounded and slain. Among them was the standard-bearer of Baresmanes, who commanded the Persian left. The fall of this man increased the general confusion. In vain did the Persian column, checked in its advance, attempt an orderly retreat. The Romans assaulted it in front and on both flanks, and a terrible carnage ensued. The crowning disaster was the death of Baresmanes, who was slain by Sunicas, the Massa-Goth; whereupon the whole Persian army broke and fled without offering any further resistance. Here fell 5000, including numbers of the “Immortals.” The slaughter would have been still greater, had not Belisarius and his lieutenant, Termogenes, with wise caution restrained the Roman troops and recalled them quickly from the pursuit of the enemy, content with the success which they had achieved. It was so long since a Roman army had defeated a Persian one in the open field that the victory had an extraordinary value, and it would have been foolish to risk a reverse in the attempt to give it greater completeness.
While these events took place in Mesopotamia, the Persian arms were also unsuccessful in the Armenian highlands, whither Kobad had sent a second army to act offensively against Rome, under the conduct of a certain Mermeroes. The Roman commanders in this region were Sittas, the former colleague of Belisarius, and Dorotheas, a general of experience. Their troops did not amount to more than half the number of the enemy, yet they contrived to inflict on the Persians two defeats, one in their own territory, the other in Roman Armenia. The superiority thus exhibited by the Romans encouraged desertions to their side; and in some instances the deserters were able to carry over with them to their new friends small portions of Persian territory.
In the year A.D. 531, after a vain attempt at negotiating terms of peace with Rome, the Persians made an effort to recover their laurels by carrying the war into a new quarter and effecting a new combination. Alamandarus, sheikh of the Saracenic Arabs, had long been a bitter enemy of the Romans, and from his safe retreat in the desert had been accustomed for fifty years to ravage, almost at his will, the eastern provinces of the empire. Two years previously he had carried fire and sword through the regions of upper Syria, had burned the suburbs of Chalcis, and threatened the Roman capital of the East, the rich and luxurious Antioch. He owed, it would seem, some sort of allegiance to Persia, although practically he was independent, and made his expeditions when and where he pleased. However, in A.D. 531, he put himself at the disposal of Persia, proposed a joint expedition, and suggested a new plan of campaign. “Mesopotamia and Osrhoene,” he said, “on which the Persians were accustomed to make their attacks, could better resist them than almost any other part of the Roman territory, In these provinces were the strongest of the Roman cities, fortified according to the latest rules of art, and plentifully supplied with every appliance of defensive warfare. There, too, were the best and bravest of the Roman troops, and an army more numerous than Rome had ever employed against Persia before. It would be most perilous to risk an encounter on this ground. Let Persia, however, invade the country beyond the Euphrates, and she would find but few obstacles. In that region there were no strong fortresses, nor was there any army worth mention. Antioch itself, the richest and most populous city of the Roman East, was without a garrison, and, if it were suddenly assaulted, could probably be taken. The incursion might be made, Antioch sacked, and the booty carried off into Persian territory before the Romans in Mesopotamia received intelligence of what was happening.” Kobad listened with approval, and determined to adopt the bold course suggested to him. He levied a force of 15,000 cavalry, and, placing it under the command of a general named Azarethes, desired him to take Alamandarus for his guide and make a joint expedition with him across the Euphrates. It was understood that the great object of the expedition was the capture of Antioch.
The allied army crossed the Euphrates below Circesium, and ascended the right bank of the river till they neared the latitude of Antioch, when they struck westward and reached Gabbula (the modern Jabul), on the north shore of the salt lake now known as the Sabakhah. Here they learned to their surprise that the movement, which they had intended to be wholly unknown to the Romans, had come to the ears of Belisarius, who had at once quitted Daras, and proceeded by forced marches to the defence of Syria, into which he had thrown himself with an army of 20,000 men, Romans, Isaurians, Lycaonians, and Arabs. His troops were already interposed between the Persians and their longed-for prey, Belisarius having fixed his headquarters at Chalcis, half a degree to the west of Gabbula, and twenty-five miles nearer to Antioch. Thus balked of their purpose, and despairing of any greater success than they had already achieved, the allies became anxious to return to Persia with the plunder of the Syrian towns and villages which they had sacked on their advance. Belisarius was quite content that they should carry off their spoil, and would have considered it a sufficient victory to have frustrated the expedition without striking a blow. But his army was otherwise minded; they were eager for battle, and hoped doubtless to strip the flying foe of his rich booty. Belisarius was at last forced, against his better judgment, to indulge their desires and allow an engagement, which was fought on the banks of the Euphrates, nearly opposite Callinicus. Here the conduct of the Roman troops in action corresponded but ill to the anxiety for a conflict. The infantry indeed stood firm, notwithstanding that they fought fasting; but the Saracenic Arabs, of whom a portion were on the Roman side, and the Isaurian and Lycaonian horse, who had been among the most eager for the fray, offered scarcely any resistance; and, the right wing of the Romans being left exposed by their flight, Belisarius was compelled to make his troops turn their faces to the enemy and their backs to the Euphrates, and in this position, where defeat would have been ruin, to meet and resist all the assaults of the foe until the shades of evening fell, and he was able to transport his troops in boats across the river. The honors of victory rested with the Persians, but they had gained no substantial advantage; and when Azarethes returned to his master he was not unjustly reproached with having sacrificed many lives for no appreciable result. The raid into Syria had failed of its chief object; and Belisarius, though defeated, had returned, with the main strength of his army intact, into Mesopotamia. The battle of Callinicus was fought on Easter Eve, April 19.
Azarethes probably reached Ctesiphon and made his report to Kobad towards the end of the month. Dissatisfied with what Azarethes had achieved, and feeling that the season was not too far advanced for a second campaign, Kobad despatched an army under three chiefs, into Mesopotamia, where Sittas was now the principal commander on the Roman side, as Belisarius had been hastily summoned to Byzantium in order to be employed against the “Vandals” in Africa. This force found no one to resist in the open field, and was therefore able to invade Sophene and lay siege to the Roman fortress of Martyropolis. Martyropolis was ill provisioned, and its walls were out of repair. The Persians must soon have taken it, had not Sittas contrived to spread reports of a diversion which the Huns were about to make as Roman allies. Fear of being caught between two fires paralyzed the Persian commanders; and before events undeceived them, news arrived in the camp that Kobad was dead, and that a new prince sat upon the throne. Under these circumstances, Chanaranges, the chief of the Persian commanders, yielded to representations made by Sittas, that peace would now probably be made between the contending powers, and withdrew his army into Persian territory.