Flavius Josephus, The Wars of the Jews
William Whiston, A.M., Ed.

[392] And now were the banks finished on the seventh day of the month Gorpieus, [Elul,] in eighteen days' time, when the Romans brought their machines against the wall. But for the seditious, some of them, as despairing of saving the city, retired from the wall to the citadel; others of them went down into the subterranean vaults, though still a great many of them defended themselves against those that brought the engines for the battery; yet did the Romans overcome them by their number and by their strength; and, what was the principal thing of all, by going cheerfully about their work, while the Jews were quite dejected, and become weak. Now as soon as a part of the wall was battered down, and certain of the towers yielded to the impression of the battering rams, those that opposed themselves fled away, and such a terror fell upon the tyrants, as was much greater than the occasion required; for before the enemy got over the breach they were quite stunned, and were immediately for flying away. And now one might see these men, who had hitherto been so insolent and arrogant in their wicked practices, to be cast down and to tremble, insomuch that it would pity one's heart to observe the change that was made in those vile persons. Accordingly, they ran with great violence upon the Roman wall that encompassed them, in order to force away those that guarded it, and to break through it, and get away. But when they saw that those who had formerly been faithful to them had gone away, (as indeed they were fled whithersoever the great distress they were in persuaded them to flee,) as also when those that came running before the rest told them that the western wall was entirely overthrown, while others said the Romans were gotten in, and others that they were near, and looking out for them, which were only the dictates of their fear, which imposed upon their sight, they fell upon their face, and greatly lamented their own mad conduct; and their nerves were so terribly loosed, that they could not flee away. And here one may chiefly reflect on the power of God exercised upon these wicked wretches, and on the good fortune of the Romans; for these tyrants did now wholly deprive themselves of the security they had in their own power, and came down from those very towers of their own accord, wherein they could have never been taken by force, nor indeed by any other way than by famine. And thus did the Romans, when they had taken such great pains about weaker walls, get by good fortune what they could never have gotten by their engines; for three of these towers were too strong for all mechanical engines whatsoever, concerning which we have treated above.