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

[30] Those therefore that were able to find the ways out of the city retired. But now Vespasian always staid among those that were hard set; for he was deeply affected with seeing the ruins of the city falling upon his army, and forgot to take care of his own preservation. He went up gradually towards the highest parts of the city before he was aware, and was left in the midst of dangers, having only a very few with him; for even his son Titus was not with him at that time, having been then sent into Syria to Mucianus. However, he thought it not safe to fly, nor did he esteem it a fit thing for him to do; but calling to mind the actions he had done from his youth, and recollecting his courage, as if he had been excited by a divine fury, he covered himself and those that were with him with their shields, and formed a testudo over both their bodies and their armor, and bore up against the enemy's attacks, who came running down from the top of the city; and without showing any dread at the multitude of the men or of their darts, he endured all, until the enemy took notice of that divine courage that was within him, and remitted of their attacks; and when they pressed less zealously upon him, he retired, though without showing his back to them till he was gotten out of the walls of the city. Now a great number of the Romans fell in this battle, among whom was Ebutius, the decurion, a man who appeared not only in this engagement, wherein he fell, but every where, and in former engagements, to be of the truest courage, and one that had done very great mischief to the Jews. But there was a centurion whose name was Gallus, who, during this disorder, being encompassed about, he and ten other soldiers privately crept into the house of a certain person, where he heard them talking at supper, what the people intended to do against the Romans, or about themselves (for both the man himself and those with him were Syrians). So he got up in the night time, and cut all their throats, and escaped, together with his soldiers, to the Romans.