Goliath was unusually strong warrior tremendous growth, native of city of Gath. Big man was clad in armor, on his head was brass helmet, holding copper shield. David did not have armor, and his only weapon was sling. David and Goliath were elected by their fellow tribesmen for fight, which was decide outcome of battle: winner of match won in war. Anyone, who watched scene, it seemed, that match result is foregone conclusion, but battle is not always determined by physical force. David won battle, he killed Goliath.