On the eighteenth day from the beginning of the siege the Goths moved against the fortifications at about sunrise under the leadership of Vittigis in order to assault the wall, and all the Romans were struck with consternation at the sight of the advancing towers and rams, with which they were altogether unfamiliar. But Belisarius, seeing the ranks of the enemy as they advanced with the engines, began to laugh, and commanded the soldiers to remain quiet and under no circumstances to begin fighting until he himself should give the signal. Now the reason why he laughed he did not reveal at the moment, but later it became known. The Romans, however, supposing him to be hiding his real feelings by a jest, abused him and called him shameless, and were indignant that he did not try to check the enemy as they came forward. But when the Goths came near the moat, the general first of all stretched his bow and with a lucky aim hit in the neck and killed one of the men in armour who were leading the army on. And he fell on his back mortally wounded, while the whole Roman army raised an extraordinary shout such as was never heard before, thinking that they had received an excellent omen. And twice did Belisarius send forth his bolt, and the very same thing happened again a second time, and the shouting rose still louder from the circuit-wall, and the Romans thought that the enemy were conquered already. Then Belisarius gave the signal for the whole army to put their bows into action, but those near himself he commanded to shoot only at the oxen. And all the oxen fell immediately, so that the enemy could neither move the towers further nor in their perplexity do anything to meet the emergency while the fighting was in progress. In this way the forethought of Belisarius in not trying to check the enemy while still at a great distance came to be understood, as well as the reason why he had laughed at the simplicity of the barbarians, who had been so thoughtless as to hope to bring oxen up to the enemy's wall. Now all this took place at the Salarian Gate. But Vittigis, repulsed at this point, left there a large force of Goths, making of them a very deep phalanx and instructing the commanders on no condition to make an assault upon the fortifications, but remaining in position to shoot rapidly at the parapet, and give Belisarius no opportunity whatever to take reinforcements to any other part of the wall which he himself might propose to attack with a superior force; he then went to the Praenestine Gate with a great force, to a part of the fortifications which the Romans call the "Vivarium,"[108] where the wall was most assailable. Now it so happened that engines of war were already there, including towers and rams and a great number of ladders.But in the meantime another Gothic assault was being made at the Aurelian Gate[109] in the following manner. The tomb of the Roman Emperor Hadrian[110] stands outside the Aurelian Gate, removed about a stone's throw from the fortifications, a very noteworthy sight. For it is made of Parian marble, and the stones fit closely one upon the other, having nothing at all[111] 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.[112] 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,[113] 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[114] 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[115]; 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.[116]