David and Goliath

David and Goliath are figures of a well-known tale in the Bible (1 Samuel 17, in most English language versions), wherein David, an Israelite shepherd-boy and future King of Israel, using his sling, defeats and kills Goliath, a giant Philistine warrior, in single combat. It is a great story of faith as David stepped forth to do this with no armor while the warriors in armor were too frightened.