Well, let's start there with the phrase "All David has is this sling," because that's the first mistake that we make. In ancient warfare, there are three kinds of warriors. There's cavalry, men on horseback and with chariots. There's heavy infantry, which are foot soldiers, armed foot soldiers with swords and shields and some kind of armor. And there's artillery, and artillery are archers, but, more importantly, slingers. And a slinger is someone who has a leather pouch with two long cords attached to it, and they put a projectile, either a rock or a lead ball, inside the pouch, and they whirl it around like this and they let one of the cords go, and the effect is to send the projectile forward towards its target. That's what David has, and it's important to understand that that sling is not a slingshot. It's not this, right? It's not a child's toy. It's in fact an incredibly devastating weapon. When David rolls it around like this, he's turning the sling around probably at six or seven revolutions per second, and that means that when the rock is released, it's going forward really fast, probably 35 meters per second. That's substantially faster than a baseball thrown by even the finest of baseball pitchers. More than that, the stones in the Valley of Elah were not normal rocks. They were barium sulphate, which are rocks twice the density of normal stones. If you do the calculations on the ballistics, on the stopping power of the rock fired from David's sling, it's roughly equal to the stopping power of a [.45 caliber] handgun. This is an incredibly devastating weapon. Accuracy, we know from historical records that slingers — experienced slingers could hit and maim or even kill a target at distances of up to 200 yards. From medieval tapestries, we know that slingers were capable of hitting birds in flight. They were incredibly accurate. When David lines up — and he's not 200 yards away from Goliath, he's quite close to Goliath — when he lines up and fires that thing at Goliath, he has every intention and every expectation of being able to hit Goliath at his most vulnerable spot between his eyes. If you go back over the history of ancient warfare, you will find time and time again that slingers were the decisive factor against infantry in one kind of battle or another.