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

[296] Now these towers were very troublesome to the Jews, who otherwise opposed the Romans very courageously; for they shot at them out of their lighter engines from those towers, as they did also by those that threw darts, and the archers, and those that flung stones. For neither could the Jews reach those that were over them, by reason of their height; and it was not practicable to take them, nor to overturn them, they were so heavy, nor to set them on fire, because they were covered with plates of iron. So they retired out of the reach of the darts, and did no longer endeavor to hinder the impression of their rams, which, by continually beating upon the wall, did gradually prevail against it; so that the wall already gave way to the Nico, for by that name did the Jews themselves call the greatest of their engines, because it conquered all things. And now they were for a long while grown weary of fighting, and of keeping guards, and were retired to lodge in the night time at a distance from the wall. It was on other accounts also thought by them to be superfluous to guard the wall, there being besides that two other fortifications still remaining, and they being slothful, and their counsels having been ill concerted on all occasions; so a great many grew lazy and retired. Then the Romans mounted the breach, where Nico had made one, and all the Jews left the guarding that wall, and retreated to the second wall; so those that had gotten over that wall opened the gates, and received all the army within it. And thus did the Romans get possession of this first wall, on the fifteenth day of the siege, which was the seventh day of the month Artemisius, [Jyar,] when they demolished a great part of it, as well as they did of the northern parts of the city, which had been demolished also by Cestius formerly.