The departure of Constantius from Rome was hastened by the alarming intelligence of the distress and danger of the Illyrian provinces. The distractions of civil war, and the irreparable loss which the Roman legions had sustained in the battle of Mursa, exposed those countries, almost without defence, to the light cavalry of the barbarians; and particularly to the inroads of the Quadi, a fierce and powerful nation, who seem to have exchanged the institutions of Germany for the arms and military arts of their Sarmatian allies. The garrisons of the frontier were insufficient to check their progress; and the indolent monarch was at length compelled to assemble, from the extremities of his dominions, the flower of the Palatine troops, to take the field in person, and to employ a whole campaign, with the preceding autumn and the ensuing spring, in the serious prosecution of the war. The emperor passed the Danube on a bridge of boats, cut in pieces all that encountered his march, penetrated into the heart of the country of the Quadi, and severely retaliated the calamities which they had inflicted on the Roman province. The dismayed barbarians were soon reduced to sue for peace; they offered the restitution of his captive subjects, as an atonement for the past, and the noblest hostages as a pledge of their future conduct. While Constantius gave laws to the barbarians beyond the Danube, he distinguished with specious compassion the Sarmatian exiles, who had been expelled from their native country by the rebellion of their slaves, and who formed a very considerable accession to the power of the Quadi. The emperor, embracing a generous but artful system of policy, released the Sarmatians from the bands of this humiliating dependence, and restored them, by a separate treaty, to the dignity of a nation united under the government of a king, the friend and ally of the republic. He declared his resolution of asserting the justice of their cause, and of securing the peace of the provinces by the extirpation, or at least the banishment, of the Limigantes, whose manners were still infected with the vices of their servile origin; and the final combat was only terminated by the extinction of the name and nation of the Limigantes. The free Sarmatians were reinstated in the possession of their ancient seats; and although Constantius distrusted the levity of their character, he entertained some hopes that a sense of gratitude might influence their future conduct.

SAPOR’S INVASION OF MESOPOTAMIA

[355-356 A.D.]

While the Roman emperor and the Persian monarch, at the distance of three thousand miles, defended their extreme limits against the barbarians of the Danube and of the Oxus, their intermediate frontier experienced the vicissitudes of a languid war, and a precarious truce. Two of the eastern ministers of Constantius, the prætorian prefect Musonian, whose abilities were disgraced by the want of truth and integrity, and Cassian, duke of Mesopotamia, a hardy and veteran soldier, opened a secret negotiation with the satrap Tamsapor. These overtures of peace, translated into the servile and flattering language of Asia, were transmitted to the camp of the Great King; who resolved to signify, by an ambassador, the terms which he was inclined to grant to the suppliant Romans. Narses, whom he invested with that character, was honourably received in his passage through Antioch and Constantinople; he reached Sirmium after a long journey, and at his first audience, respectfully unfolded the silken veil which covered the haughty epistle of his sovereign. A few days after the departure of Narses, three ambassadors were sent to the court of Sapor, who was already returned from the Scythian expedition to his ordinary residence of Ctesiphon. The ambassadors of Rome retired without success, and a second embassy of a still more honourable rank was detained in strict confinement, and threatened either with death or exile.

The military historian, Ammianus, who was himself despatched to observe the army of the Persians as they were preparing to construct a bridge of boats over the Tigris, beheld from an eminence the plain of Assyria, as far as the edge of the horizon, covered with men, with horses, and with arms. Sapor appeared in the front, conspicuous by the splendour of his purple. The Roman deserter, who in some measure guided the councils of Sapor, had prudently advised that instead of wasting the summer in tedious and difficult sieges, he should march directly to the Euphrates, and press forwards without delay to seize the feeble and wealthy metropolis of Syria. But the Persians were no sooner advanced into the plains of Mesopotamia than they discovered that every precaution had been used which could retard their progress or defeat their design. Their skilful guide, changing his plan of operations, then conducted the army by a longer circuit, but through a fertile territory, towards the head of the Euphrates, where the infant river is reduced to a shallow and accessible stream. Sapor overlooked, with prudent disdain, the strength of Nisibis; but as he passed under the walls of Amida, he resolved to try whether the majesty of his presence would not awe the garrison into immediate submission. The sacrilegious insult of a random dart, which glanced against the royal tiara, convinced him of his error; and the indignant monarch listened with impatience to the advice of his ministers, who conjured him not to sacrifice the success of his ambition to the gratification of his resentment. The following day Grumbates advanced towards the gates with a select body of troops, and required the instant surrender of the city as the only atonement which could be accepted for such an act of rashness and insolence. His proposals were answered by a general discharge, and his only son, a beautiful and valiant youth, was pierced through the heart by a javelin shot from one of the ballistæ.

The ancient city of Amid, or Amida, was provided with an arsenal of military engines, and the ordinary garrison had been reinforced to the amount of seven legions, when the place was invested by the arms of Sapor. In one of the fiercest of his repeated assaults, Amida was betrayed by the treachery of a deserter, who indicated to the barbarians a secret and neglected staircase scooped out of the rock that hangs over the stream of the Tigris. The soldiers, the citizens, their wives, their children, all who had not time to escape through the opposite gate, were involved by the conquerors in a promiscuous massacre.

But the ruin of Amida was the safety of the Roman provinces. As soon as the first transports of victory had subsided, Sapor was at leisure to reflect that to chastise a disobedient city, he had lost the flower of his troops, and the most favourable season for conquest. Thirty thousand of his veterans had fallen under the walls of Amida, during the continuance of a siege which lasted seventy-three days; and the disappointed monarch returned to his capital with affected triumph and secret mortification. Instead of aspiring in the ensuing spring to the conquest of the East, he was obliged to content himself with the reduction of two fortified cities of Mesopotamia, Singara, and Bezabde. Five Roman legions, of the diminutive size to which they had been reduced in the age of Constantine, were made prisoners, and sent into remote captivity on the extreme confines of Persia. After dismantling the walls of Singara, the conqueror abandoned that solitary and sequestered place; but he carefully restored the fortifications of Bezabde, and fixed in that important post a garrison or colony of veterans, amply supplied with every means of defence, and animated by high sentiments of honour and fidelity.

The defence of the East against the arms of Sapor required, and would have exercised, the abilities of the most consummate general; and it seemed fortunate for the state, that it was the actual province of the brave Ursicinus, who alone deserved the confidence of the soldiers and people. In the hour of danger, Ursicinus was removed from his station by the intrigues of the eunuchs; and the military command of the East was bestowed, by the same influence, on Sabinian, a wealthy and subtle veteran, who had attained the infirmities, without acquiring the experience, of age. By a second order, which issued from the same jealous and inconstant counsels, Ursicinus was again despatched to the frontier of Mesopotamia, and condemned to sustain the labours of a war, the honours of which had been transferred to his unworthy rival. Sabinian fixed his indolent station under the walls of Edessa, and whenever Ursicinus recommended any vigorous plan of operations to relieve the distress of Amida, the timid and envious commander alleged that he was restrained by his positive orders from endangering the safety of the troops. Amida was at length taken; its bravest defenders, who had escaped the sword of the barbarians, died in the Roman camp by the hand of the executioner; and Ursicinus himself, after supporting the disgrace of a partial inquiry, was punished for the misconduct of Sabinian by the loss of his military rank. After Constantius had subdued or pacified the barbarians of the Danube, he proceeded by slow marches into the East; and after he had wept over the smoking ruins of Amida, he formed with a powerful army the siege of Bezabde. The walls were shaken by the reiterated efforts of the most enormous of the battering-rams; the town was reduced to the last extremity; but it was still defended by the patient and intrepid valour of the garrison, till the approach of the rainy season obliged the emperor to raise the siege, and ingloriously to retreat into his winter quarters at Antioch. The pride of Constantius, and the ingenuity of his courtiers, were at a loss to discover any materials for panegyric in the events of the Persian War; while the glory of his cousin Julian, to whose military command he had intrusted the provinces of Gaul, was proclaimed to the world in the concise narrative of his exploits.

JULIAN IN GAUL

[356-357 A.D.]