When all the Israelites who had been hiding in the hill country of Ephraim heard that the Philistines were fleeing, they also joined the battle in close pursuit.
KJV
Likewise all the men of Israel which had hid themselves in mount Ephraim, [when] they heard that the Philistines fled, even they also followed hard after them in the battle.
ASV
Likewise all the men of Israel that had hid themselves in the hill-country of Ephraim, when they heard that the Philistines fled, even they also followed hard after them in the battle.