2 Samuel 18:5

2 And David sent forth a third part of the people under the hand of Joab, and a third part under the hand of Abishai the son of Zeruiah, Joab’s brother, and a third part under the hand of Ittai the Gittite. And the king said unto the people, I will surely go forth with you myself also.

3 But the people answered, Thou shalt not go forth: for if we flee away, they will not care for us; neither if half of us die, will they care for us: but now [thou art] worth ten thousand of us: therefore now [it is] better that thou succour us out of the city.

4 And the king said unto them, What seemeth you best I will do. And the king stood by the gate side, and all the people came out by hundreds and by thousands.

5 And the king commanded Joab and Abishai and Ittai, saying, [Deal] gently for my sake with the young man, [even] with Absalom. And all the people heard when the king gave all the captains charge concerning Absalom.

6 So the people went out into the field against Israel: and the battle was in the wood of Ephraim;

7 Where the people of Israel were slain before the servants of David, and there was there a great slaughter that day of twenty thousand [men].

8 For the battle was there scattered over the face of all the country: and the wood devoured more people that day than the sword devoured.