1 Samuel 14:20-21

Then Saul, and all the people that were with him, shouted together, and they came to the place of the fight: and behold every man's sword was turned upon his neighbour, and there was a very great slaughter.

Moreover, the Hebrews that had been with the Philistines yesterday and the day before, and went up with them into the camp, returned to be with the Israelites, who were with Saul and Jonathan.