1 Samuel 14:20-23

Then Saul and all the people who were with him rallied and went into the battle; and behold, every [Philistine] man’s sword was against his companion, in wild confusion. Now the Hebrews who were with the Philistines previously, who went up with them all around in the camp, they also turned to be with the Israelites who were with Saul and Jonathan. When all the men of Israel who had hidden themselves in the hill country of Ephraim heard that the Philistines had fled, they too pursued them closely in the battle. So the LORD saved Israel that day, and the battle spread beyond Beth-aven.