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But Mermeroes, after passing the Iberian frontier with the whole Median army, was moving forward with the River Phasis on his right. For he was quite unwilling to go through the country of Lazica, lest any obstacle should confront him there. For he was eager to save the city of Petra and the Persians in it, even though a portion of the circuit-wall had fallen down suddenly. For it had been hanging in the air, as I have said; and volunteers from the Roman army to the number of fifty got inside the city, and raised the shout proclaiming the Emperor Justinian triumphant. These men were led by a young man of Armenian birth, John by name, the son of Thomas whom they used to call by the surname Gouzes. This Thomas had built many of the strongholds about Lazica at the direction of the emperor, and he commanded the soldiers there, seeming to the emperor an intelligent person. Now John, when the Persians joined battle with his men, was wounded and straightway withdrew to the camp with his followers, since no one else of the Roman army came to support him. Meanwhile the Persian Mirranes who commanded the garrison in Petra, fearing for the city, directed all the Persians to keep guard with the greatest diligence, and he himself went to Dagisthaeus, and addressed him with fawning speeches and deceptive words, agreeing readily to surrender the city not long afterwards. In this way he succeeded in deceiving him so that the Roman army did not immediately enter the city.
Now when the army of Mermeroes came to the pass, the Roman garrison, numbering one hundred men, confronted them there and offered a stalwart resistance, and they held in check their opponents who were attempting the entrance. But the Persians by no means withdrew, but those who fell were constantly replaced by others, and they kept advancing, trying with all their strength to force their way in. Among the Persians more than a thousand perished, but at last the Romans were worn out with killing, and, being forced back by the throng, they withdrew, and running up to the heights of the mountain there were saved. Dagisthaeus, upon learning this, straightway abandoned the siege without giving any commands to the army, and proceeded to the River Phasis; and all the Romans followed him, leaving their possessions behind in the camp. And when the Persians observed what was being done, they opened their gates and came forth, and approached the tents of the enemy in order to capture the camp. But the Tzani, who had not followed after Dagisthaeus, as it happened, rushed out to defend the camp, and they routed the enemy without difficulty and killed many. So the Persians fled inside their fortifications, and the Tzani, after plundering the Roman camp proceeded straight for Rhizaeum. And from there they came to Athens and betook themselves to their homes through the territory of the Trapezuntines.
And Mermeroes and the Median army came there on the ninth day after the withdrawal of Dagisthaeus; and in the city they found left of the Persian garrison three hundred and fifty men wounded and unfit for fighting, and only one hundred and fifty men unhurt; for all the rest had perished. Now the survivors had in no case thrown the bodies of the fallen outside the fortifications, but though stifled by the evil stench, they held out in a manner beyond belief, in order that they might not afford the enemy any encouragement for the prosecution of the siege, by letting them know that most of their number had perished. And Mermeroes remarked by way of a taunt that the Roman state was worthy of tears and lamentation, because they had come to such a state of weakness that they had been unable by any device to capture one hundred and fifty Persians without a wall. And he was eager to build up the portions of the circuit-wall which had fallen down; but since at the moment he had neither lime nor any of the other necessary materials for the building ready at hand, he devised the following plan. Filling with sand the linen bags in which the Persians had carried their provisions into the land of Colchis, he laid them in the place of the stones, and the bags thus arranged took the place of the wall. And choosing out three thousand of his able fighting men, he left them there, depositing with them victuals for no great length of time, and commanding them to attend to the building of the fortifications; then he himself with all the rest of the army turned back and marched away.
But since, if he went from there by the same road, no means of provisioning his army was available, since he had left everything in Petra which had been brought in by the army from Iberia, he planned to go by another route through the mountains, where he learned that the country was inhabited, in order that by foraging there he might be able to live off the land. In the course of this journey one of the notables among the Lazi, Phoubelis by name, laid an ambush for the Persians while camping for the night, bringing with him Dagisthaeus with two thousand of the Romans; and these men, making a sudden attack, killed some of the Persians who were grazing their horses, and after securing the horses as plunder they shortly withdrew. Thus, then, Mermeroes with the Median army departed from there.
But Goubazes, upon learning what had befallen the Romans both at Petra and at the pass, did not even so become frightened, nor did he give up the guarding of the pass where he was, considering that their hope centred in that place. For he understood that, even if the Persians had been able by forcing back the Romans on the left of the River Phasis to cross over the pass and get into Petra, they could thereby inflict no injury upon the land of the Lazi, since they were utterly unable to cross the Phasis, in particular because no ships were at their disposal. For in depth this river is not inferior to the deepest rivers, and it spreads out to a great width. Moreover it has such a strong current that when it empties into the sea, it goes on as a separate stream for a very great distance, without mingling at all with the sea-water. Indeed, those who navigate in those parts are able to draw up drinking water in the midst of the sea. Moreover, the Lazi have erected fortresses all along the right bank of the river, in order that, even when the enemy are ferried across in boats, they may not be able to disembark on the land.
The Emperor Justinian at this time sent to the nation of the Sabeiri the money which had been agreed upon, and he rewarded Goubazes and the Lazi with additional sums of money. And it happened that long before this time he had sent another considerable army also to Lazica, which had not yet arrived there. The commander of this army was Rhecithancus, from Thrace, a man of discretion and a capable warrior. Such then was the course of these events.
Now when Mermeroes got into the mountains, as I have said, he was anxious to fill Petra with provisions from there. For he did not by any means think that the victuals which they had brought in with them would suffice for the garrison there, amounting to three thousand men. But since the supplies they found along the way barely sufficed for the provisioning of that army, which numbered no less than thirty thousand, and since on this account they were able to send nothing at all of consequence to Petra, upon consideration he found it better for them that the greater part of the army should depart from the land of Colchis, and that some few should remain there, who were to convey to the garrison in Petra the most of the provisions which they might find, while using the rest to maintain themselves comfortably. He therefore selected five thousand men and left them there, appointing as commanders over them Phabrizus and three others. For it seemed to him unnecessary to leave more men there, since there was no enemy at all. And he himself with the rest of the army came into Persarmenia and remained quietly in the country around Doubios.
Now the five thousand, upon coming nearer to the frontier of Lazica, encamped in a body beside the Phasis River, and from there they went about in small bands and plundered the neighbouring country. Now when Goubazes perceived this, he sent word to Dagisthaeus to hasten there to his assistance: for it would be possible for them to do the enemy some great harm. And he did as directed, moving forward with the whole Roman army with the River Phasis on the left, until he came to the place where the Lazi where encamped on the opposite bank of the river. Now it happened that the Phasis could be forded at this point, a fact which neither the Romans nor the Persians suspected in the least because of their lack of familiarity with these regions; but the Lazi knew it well, and they made the crossing suddenly and
joined the Roman army. And the Persians chose out a thousand men of repute among them and sent them forth, that no one might advance against the camp to harm it. And two of this force, who had gone out ahead of their fellows to reconnoitre, fell unexpectedly into the hands of the enemy and informed them of the whole situation. The Romans, therefore, and the Lazi fell suddenly upon the thousand men, and not one of them succeeded in escaping, but the most of them were slain, while some also were captured; and through these the men of Goubazes and Dagisthaeus succeeded in learning the numbers of the Median army and the length of the journey to them and the condition in which they then were. They therefore broke camp and marched against them with their whole army, calculating so that they would fall upon them well on in the night; their own force amounted to fourteen thousand men. Now the Persians, having no thought of an enemy in their minds, were enjoying a long sleep; for they supposed that the river was impassable, and that the thousand men, with no one to oppose them, were making a long march somewhere. But the Romans and Lazi at early dawn unexpectedly fell upon them, and they found some still buried in slumber and others just roused from sleep and lying defenceless upon their beds. Not one of them, therefore, thought of resistance, and the majority were caught and killed, while some also were captured by the enemy, among whom happened to be one of the commanders; only a few escaped in the darkness and were saved. And the Romans and Lazi captured the camp and all the standards, and they also secured many weapons and a great deal of money as plunder, besides great numbers of horses and mules. And pursuing them for a very great distance they came well into Iberia. There they happened upon certain others of the Persians also and slew a great number. Thus the Persians departed from Lazica; and the Romans and Lazi found there all the supplies, including great quantities of flour, which the barbarians had brought in from Iberia, in order to transport them to Petra, and they burned them all. And they left a large number of Lazi in the pass, so that it might no longer be possible for the Persians to carry in supplies to Petra, and they returned with all the plunder and the captives. [549 A.D.] And the fourth year of the truce between the Romans and Persians came to an end, being the twenty-third year of the reign of the Emperor Justinian.
Delphi Complete Works of Procopius Page 364