2 Samuel 18:5-9

The king ordered Joab and Abishai and Ittai, saying, “Deal gently for my sake with the young man Absalom.” And all the people heard when the king gave orders to all the commanders concerning Absalom. So the army went out into the field against Israel; and the battle was fought in the forest of Ephraim. The men of Israel were defeated there by the servants of David, and the slaughter there was great on that day, twenty thousand men. The battle spread over the face of all the country; and the forest claimed more victims that day than the sword. Absalom happened to meet the servants of David. Absalom was riding on his mule, and the mule went under the thick branches of a great oak. His head caught fast in the oak, and he was left hanging between heaven and earth, while the mule that was under him went on.