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

[236] Then did Joab put his army in battle-array over against the enemy in the Great Plain, where he had a wood behind him. Absalom also brought his army into the field to oppose him. Upon the joining of the battle, both sides showed great actions with their hands and their boldness; the one side exposing themselves to the greatest hazards, and using their utmost alacrity, that David might recover his kingdom; and the other being no way deficient, either in doing or suffering, that Absalom might not be deprived of that kingdom, and be brought to punishment by his father for his impudent attempt against him. Those also that were the most numerous were solicitous that they might not be conquered by those few that were with Joab, and with the other commanders, because that would be the greater disgrace to them; while David's soldiers strove greatly to overcome so many ten thousands as the enemy had with them. Now David's men were conquerors, as superior in strength and skill in war; so they followed the others as they fled away through the forests and valleys; some they took prisoners, and many they slew, and more in the flight than in the battle for there fell about twenty thousand that day. But all David's men ran violently upon Absalom, for he was easily known by his beauty and tallness. He was himself also afraid lest his enemies should seize on him, so he got upon the king's mule, and fled; but as he was carried with violence, and noise, and a great motion, as being himself light, he entangled his hair greatly in the large boughs of a knotty tree that spread a great way, and there he hung, after a surprising manner; and as for the beast, it went on farther, and that swiftly, as if his master had been still upon his back; but he, hanging in the air upon the boughs, was taken by his enemies. Now when one of David's soldiers saw this, he informed Joab of it; and when the general said, that if he had shot at and killed Absalom, he would have given him fifty shekels, - he replied, "I would not have killed my master's son if thou wouldst have given me a thousand shekels, especially when he desired that the young man might be spared in the hearing of us all." But Joab bade him show him where it was that he saw Absalom hang; whereupon he shot him to the heart, and slew him, and Joab's armor-bearers stood round the tree, and pulled down his dead body, and cast it into a great chasm that was out of sight, and laid a heap of stones upon him, till the cavity was filled up, and had both the appearance and the bigness of a grave. Then Joab sounded a retreat, and recalled his own soldiers from pursuing the enemy's army, in order to spare their countrymen.