David, who was fourteen years old at this time, finally answered to challenge. He was skilled on use of sling, and he found out a way how he could win him. He accurately slung a stone on Goliath's forehead, just below his helmet. The stone knocked Goliath out. David then ran to unconscious Goliath, pulled his sword off the scabbard, and cut his head off. Seeing a fourteen-year-old boy killing their champion, the Philistine army demoralized.