When Saul saw David go forth against the Philistine, he said to Abner, the captain of the host, Abner, whose son is this youth? Abner said, As your soul lives, O king, I can't tell.
And so on the mountain on the one side was the camp of the Philistines, on the mountain on the other side was the camp of Israel ( 1 Samuel 17:3 ):