John Wesley on 1 Samuel 14:13

They fell - For being endowed with extraordinary strength and courage, and having with incredible boldness killed the first they met with, it is not strange if the Philistines were both astonished and intimidated; God also struck them with a panic; and withal, infatuated their minds, and possibly, put an evil spirit among them, which in this universal confusion made them conceive that there was treachery among themselves, and therefore caused them to sheathe their swords in one anothers bowels.