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

[356] Thus did the Romans spend four days in bringing this subsistence-money to the several legions. But on the fifth day, when no signs of peace appeared to come from the Jews, Titus divided his legions, and began to raise banks, both at the tower of Antonia and at John's monument. Now his designs were to take the upper city at that monument, and the temple at the tower of Antonia; for if the temple were not taken, it would be dangerous to keep the city itself; so at each of these parts he raised him banks, each legion raising one. As for those that wrought at John's monument, the Idumeans, and those that were in arms with Simon, made sallies upon them, and put some stop to them; while John's party, and the multitude of zealots with them, did the like to those that were before the tower of Antonia. These Jews were now too hard for the Romans, not only in direct fighting, because they stood upon the higher ground, but because they had now learned to use their own engines; for their continual use of them one day after another did by degrees improve their skill about them; for of one sort of engines for darts they had three hundred, and forty for stones; by the means of which they made it more tedious for the Romans to raise their banks. But then Titus, knowing that the city would be either saved or destroyed for himself, did not only proceed earnestly in the siege, but did not omit to have the Jews exhorted to repentance; so he mixed good counsel with his works for the siege. And being sensible that exhortations are frequently more effectual than arms, he persuaded them to surrender the city, now in a manner already taken, and thereby to save themselves, and sent Josephus to speak to them in their own language; for he imagined they might yield to the persuasion of a countryman of their own.