2 Samuel 18:6
So the people went out into the field against Israel: and the battle was in the forest of Ephraim;
Joshua 17:18
But the mountain country shall be yours; for it is a forest, and you shall cut it down: and all the borders of it shall be yours: for you shall drive out the Canaanites, though they have iron chariots, and though they are strong.
Joshua 17:15
And Joshua answered them, If you are a great people, then get up to the forest country, and clear ground for yourself there in the land of the Perizzites and of the giants, if mount Ephraim is too narrow for you.
Judges 12:4-6
Then Jephthah gathered together all the men of Gilead, and fought with Ephraim: and the men of Gilead struck down Ephraim, because they said, You Gileadites are fugitives of Ephraim among the Ephraimites, and among the Manassites.