he commanded Dagisteus, with seven thousand Romans, and one thousand of the Zani, * to expel the Persians from the coast of the Euxine.

The siege of Petra, which the Roman general, with the aid of the Lazi, immediately undertook, is one of the most remarkable actions of the age. The city was seated on a craggy rock, which hung over the sea, and communicated by a steep and narrow path with the land. Since the approach was difficult, the attack might be deemed impossible: the Persian conqueror had strengthened the fortifications of Justinian; and the places least inaccessible were covered by additional bulwarks. In this important fortress, the vigilance of Chosroes had deposited a magazine of offensive and defensive arms, sufficient for five times the number, not only of the garrison, but of the besiegers themselves. The stock of flour and salt provisions was adequate to the consumption of five years; the want of wine was supplied by vinegar; and of grain from whence a strong liquor was extracted, and a triple aqueduct eluded the diligence, and even the suspicions, of the enemy. But the firmest defence of Petra was placed in the valor of fifteen hundred Persians, who resisted the assaults of the Romans, whilst, in a softer vein of earth, a mine was secretly perforated. The wall, supported by slender and temporary props, hung tottering in the air; but Dagisteus delayed the attack till he had secured a specific recompense; and the town was relieved before the return of his messenger from Constantinople. The Persian garrison was reduced to four hundred men, of whom no more than fifty were exempt from sickness or wounds; yet such had been their inflexible perseverance, that they concealed their losses from the enemy, by enduring, without a murmur, the sight and putrefying stench of the dead bodies of their eleven hundred companions. After their deliverance, the breaches were hastily stopped with sand-bags; the mine was replenished with earth; a new wall was erected on a frame of substantial timber; and a fresh garrison of three thousand men was stationed at Petra to sustain the labors of a second siege. The operations, both of the attack and defence, were conducted with skilful obstinacy; and each party derived useful lessons from the experience of their past faults. A battering-ram was invented, of light construction and powerful effect: it was transported and worked by the hands of forty soldiers; and as the stones were loosened by its repeated strokes, they were torn with long iron hooks from the wall. From those walls, a shower of darts was incessantly poured on the heads of the assailants; but they were most dangerously annoyed by a fiery composition of sulphur and bitumen, which in Colchos might with some propriety be named the oil of Medea. Of six thousand Romans who mounted the scaling-ladders, their general Bessas was the first, a gallant veteran of seventy years of age: the courage of their leader, his fall, and extreme danger, animated the irresistible effort of his troops; and their prevailing numbers oppressed the strength, without subduing the spirit, of the Persian garrison. The fate of these valiant men deserves to be more distinctly noticed. Seven hundred had perished in the siege, two thousand three hundred survived to defend the breach. One thousand and seventy were destroyed with fire and sword in the last assault; and if seven hundred and thirty were made prisoners, only eighteen among them were found without the marks of honorable wounds. The remaining five hundred escaped into the citadel, which they maintained without any hopes of relief, rejecting the fairest terms of capitulation and service, till they were lost in the flames. They died in obedience to the commands of their prince; and such examples of loyalty and valor might excite their countrymen to deeds of equal despair and more prosperous event. The instant demolition of the works of Petra confessed the astonishment and apprehension of the conqueror.

A Spartan would have praised and pitied the virtue of these heroic slaves; but the tedious warfare and alternate success of the Roman and Persian arms cannot detain the attention of posterity at the foot of Mount Caucasus. The advantages obtained by the troops of Justinian were more frequent and splendid; but the forces of the great king were continually supplied, till they amounted to eight elephants and seventy thousand men, including twelve thousand Scythian allies, and above three thousand Dilemites, who descended by their free choice from the hills of Hyrcania, and were equally formidable in close or in distant combat. The siege of Archæopolis, a name imposed or corrupted by the Greeks, was raised with some loss and precipitation; but the Persians occupied the passes of Iberia: Colchos was enslaved by their forts and garrisons; they devoured the scanty sustenance of the people; and the prince of the Lazi fled into the mountains. In the Roman camp, faith and discipline were unknown; and the independent leaders, who were invested with equal power, disputed with each other the preeminence of vice and corruption. The Persians followed, without a murmur, the commands of a single chief, who implicitly