1 Samuel 14:20-23

Then Saul gathered his army and entered the battle. They found the Philistines confused, striking each other with their swords! Earlier, there were Hebrews who had served the Philistines and had stayed in their camp, but now they joined the Israelites with Saul and Jonathan. When all the Israelites hidden in the mountains of Ephraim heard that the Philistine soldiers were running away, they also joined the battle and chased the Philistines. So the LORD saved the Israelites that day, and the battle moved on past Beth Aven.