1 Samuel 14:21-23

New Revised Standard Version, Anglicised Catholic Edition

²¹ Now the Hebrews who previously had been with the Philistines and had gone up with them into the camp turned and joined the Israelites who were with Saul and Jonathan. ²² Likewise, when all the Israelites who had gone into hiding in the hill country of Ephraim heard that the Philistines were fleeing, they too followed closely after them in the battle. ²³ So the Lord gave Israel the victory that day.

The battle passed beyond Beth-aven, and the troops with Saul numbered altogether about ten thousand men. The battle spread out over the hill country of Ephraim.