1 Samuel 31:6-7

So Saul died, and his three sons, and his armourbearer, and all his men, that same day together. And when the men of Israel that were on the other side of the valley, and they that were on the other side Jordan, saw that the men of Israel fled, and that Saul and his sons were dead, they forsook the cities, and fled; and the Philistines came and dwelt in them.