1 Samuel 14:20-21

There was a very great discomfiture Namely, in the army of the Philistines; which, it is likely, consisted of various nations, and in the confusion into which they were thrown, they fell upon one another, not distinguishing friends from enemies. The Hebrews that were with the Philistines Having gone with their army, either by constraint, as servants, or in policy, to gain their favour and protection. They also turned to be with the Israelites In the midst of this battle they went over to their own countrymen.