So the people went out into the field of battle against Israel. And the battle was in the woods of Ephraim.
2 Samuel 18:6
Surrounding context
18:5 Now the king had commanded Joab, Abishai, and Ittai, saying, "Deal gently for my sake with the young man Absalom." And all the people heard when the king gave all the captains orders concerning Absalom.
18:6 So the people went out into the field of battle against Israel. And the battle was in the woods of Ephraim.
18:7 The people of Israel were overthrown there before the servants of David, and a great slaughter of twenty thousand took place there that day.