excerpts from Procopius
from: Procopius, H. B. Dewing (translator), History of the Wars, Book V and VI (Cambridge, MA: Harvard University Press, 1968).
p. 211-217: But in the meantime another Gothic assault was being made at the Aurelian Gate in the following manner. The tomb of the Roman Emperor Hadrian stands outside the Aurelian Gate, removed about a stone's throw from the fortifications, a very worthy sight. For it is made of Parian marble, and the stones fit closely one upon the other, having nothing at all between them. And it has four sides which are all equal, each being about a stone's throw in length, while their height exceeds that of the city wall; and above there are statues of the same marble, representing men and horses, of wonderful workmanship. But since this tomb seemed to the men of ancient times a fortress threatening the city, they enclosed it by two walls, which extend to it from the circuit-wall, and thus made it a part of the wall. And, indeed, it gives the appearance of a high tower built as a bulwark before the gate there. So the fortifications at that point were most adequate. Now Constantinus, as it happened, had been appointed by Belisarius to have charge of the garrison at this tomb. And he had instructed him also to attend to the guarding of the adjoining wall, which had a small and inconsiderable garrison. For, since that part of the circuit-wall was the least assailable of all, because the river flows along it, he supposed that no assault would be made there, and so stationed an insignificant garrison at that place, and, since the soldiers he had were few, he assigned the great majority to the positions where there was most need of them. For the emperor's army gathered in Rome at the beginning of this siege amounted at most to only five thousand men. But since it was reported to Constantinus that the enemy were attempting the crossing of the Tiber, he became fearful for that part of the fortifications and went thither himself with all speed, accompanied by some few men to lend assistance, commanding the greater part of his men to attend to the guarding of the gate and the tomb. But meanwhile the Goths began an assault upon the Aurelian Gate and the Tower of Hadrian, and though they had no engines of war, they brought up a great quantity of ladders, and thought that by shooting a vast number of arrows they would very easily reduce the enemy to a state of helplessness and overpower the garrison there without any trouble on account of its small numbers. And as they advanced, they held before them shields no smaller than the long shields used by the Persians, and they succeeded in getting very close to their opponents without being perceived by them. For they came hidden under the colonnade which extends to the church of the Apostle Peter. From that shelter they suddenly appeared and began the attack, so that the guards were neither able to use the engine called the ballista (for these engines do not send their missiles except straight out), nor, indeed, could they ward off their assailants with their arrows, since the situation was against them on account of the large shields. But the Goths kept pressing vigorously upon them, shooting many missiles at the battlements, and they were already about to set their ladders against the wall, having practically surrounded those who were fighting from the tomb; for whenever the Goths advanced they always got in the rear of the Romans on both flanks; and for a short time consternation fell upon the Romans, who knew not what means of defence they should employ to save themselves, but afterwards by common agreement they broke in pieces the most of the statues, which were very large, and taking up great numbers of stones thus secured, threw them with both hands down upon the heads of the enemy, who gave way before this shower of missiles. And as they retreated a little way, the Romans, having by now the advantage, plucked up courage, and with a mighty shout began to drive back their assailants by using their bows and hurling stones at them. And putting their hands to the engines, they reduced their opponents to great fear, and their assault was quickly ended. And by this time Constantinus also was present, having frightened back those who had tried the river and easily driven them off, because they did not find the wall there entirely unguarded, as they had supposed they would. And thus safety was restored at the Aurelian Gate.
p. 245-47: At that time some of the Romans attempted secretly to force open the doors of the temple of Janus. This Janus was the first of the ancient gods whom the Romans call in their own tongue Penates. And he has his temple in that part of the forum in front of the senate-house which lies a little above the "Tria Fita"; for thus the Romans are accustomed to call the Moirai. And the temple is entirely of bronze and was erected in the form of a square, but it is only large enough to cover the statue of Janus. Now this statue is of bronze, and not less than five cubits high; in all other respects it resembles a man, but its head has two faces, one of which is turned toward the east and the other toward the west. And there are brazen doors fronting each face, which the Romans in olden times were accustomed to close in time of peace and prosperity, but when they had war they opened them. But when the Romans came to honour, as truly as any others, the teachings of the Christians, they gave up the custom of opening these doors, even when they were at war. During this siege, however, some, I suppose, who had in mind the old belief, attempted secretly to open them, but they did not succeed entirely, and moved the doors only so far that they did not close tightly against one another as formerly. And those who had attempted to do this escaped detection; and no investigation of the act was made, as was natural in a time of great confusion, since it did not become known to the commanders, nor did it reach the ears of the multitude, except of a very few.
p. 289-91: After this the Romans no longer dared risk a battle with their whole army; but they engaged in cavalry battles, making sudden sallies in the same manner as before, and were generally victorious over the barbarians. Foot-soldiers also went out from both sides, not, however, arrayed in a phalanx, but accompanying the horsemen. And once Bessas in the first rush dashed in among the enemy carrying his spear and killed three of their best horsemen and turned the rest to flight. And another time, when Constantinus had led out the Huns in the Plain of Nero in the late afternoon, and saw that they were being overpowered by the superior numbers of their opponents, he took the following measures. There has been in that place from of old a great stadium (Circus Hadriani or Circus Domitiae?) where the gladiators of the city used to fight in former times, and the men of old built many other buildings round about this stadium; consequently there are, as one would expect, narrow passages all about this place. Now on the occasion in question, since Constantinus could neither overcome the throng of the Goths nor flee without great danger, he caused all the Huns to dismount from their horses, and on foot, in company with them, took his stand in one of the narrow passages there. Then by shooting from that safe position they slew large numbers of the enemy. And for some time the Goths withstood their missiles. For they hoped, as soon as the supply of missiles in the quivers of the Huns should be exhausted, to be able to surround them without any trouble, take them prisoners, and lead them back to their camp. But since the Massagetac, who were not only good bowmen but also had a dense throng to shoot into, hit an enemy with practically every shot, the Goths perceived that above half their number had perished, and since the sun was about to set, they knew not what to do and so rushed off in flight. Then indeed many of them fell; for the Massagetae followed them up, and since they know how to shoot the bow with the greatest accuracy even when running at great speed, they continued to discharge their arrows no less than before, shooting at their backs, and kept up the slaughter. And thus Constantinus with his Huns came back to Rome at night.
p. 217-19: But at the gate beyond the Tiber River, which is called the Pancratian Gate, a force of the enemy came, but accomplished nothing worth mentioning because of the strength of the place; for the fortifications of the city at this point are on a steep elevation and are not favourably situated for assaults. Paulus was keeping guard there with an infantry detachment which he commanded in person. In like manner they made no attempt on the Flaminian Gate, because it is situated on a precipitous slope and is not very easy of access. The "Reges," an infantry detachment, were keeping guard there with Ursicinus, who commanded them. And between this gate and the small gate next on the right, which is called the Pincian, a certain portion of the wall had split open of its own accord in ancient times, not clear to the ground, however, but about half way down, but still it had not fallen or been otherwise destroyed, though it leaned so to either side that one part of it appeared outside the rest of the wall and the other inside. And from this circumstance the Romans from ancient times have called the place "Broken Wall" in their own tongue. But when Belisarius in the beginning undertook to tear down this portion and rebuild it, the Romans prevented him, declaring that the Apostle Peter had promised them that he would care for the guarding of the wall there. This Apostle is reverenced by the Romans and held in awe above all others. And the outcome of events at this place was in all respects what the Romans contemplated and expected. For neither on that day nor throughout the whole time during which the Goths were besieging Rome did any hostile force come to that place, nor did any disturbance occur there. And we marvelled indeed that it never occurred to us nor to the enemy to remember this portion of the fortifications during the whole time, either while they were making their assaults or carrying out their designs against the wall by night; and yet many such attempts were made. It was for this reason, in fact, that at a later time also no one ventured to rebuild this part of the defences, but tip to the present day the wall there is split open in this way.
p. 223: Now the ground there was very level, and consequently the place lay open to the attacks of any assailant. And for some reason the wall at that point bad crumbled a great deal, and to such an extent that the binding of the bricks did not hold together very well. Consequently the ancient Romans had built another wall of short length outside of it and encircling it, not for the sake of safety (for it was neither strengthened with towers, nor indeed was there any battlement built upon it, nor any other means by which it would have been possible to repulse an enemy's assault upon the fortifications), but in order to provide for an unseemly kind of luxury, namely, that they might confine and keep there lions and other wild animals. And it is for this reason that this place has been named the Vivarium; for thus the Romans call a place where untamed animals are regularly cared for.