1 Samuel 17:2

17:2 Saul and the Israelite army assembled and camped in the valley of Elah, where they arranged their battle lines to fight against the Philistines.

1 Samuel 17:50

17:50 David prevailed over the Philistine with just the sling and the stone. He struck down the Philistine and killed him. David did not even have a sword in his hand.