In 1.Sam.17 we see a detail description of an enemy of the LORD, and a anointed-one who exposes, then destroys the enemy.
We read that the Philistines armies were gathered for battle, on land that belonged to Judah: and Goliath of Gath was their spokesman and point-person.
David, at 16,-17 yrs. of age, overheard Goliath talking trash, and was offended.
David knew the cause. He told Goliath "I come to thee in the Name of the LORD of host, whom thou hast defied." All this assembly this day shall know that the LORD Saves not by sword and spear: for the battle is the LORD's and HE will give you unto our hands."
When Goliath moved, David -ran- to meet him. While closing the distance, reached into his bag, and took a stone, and slung it, and smote Goliath in the forehead, and Goliath fell upon his face to the ground. Davis
ground. David ran to Goliath, took Goliath's sword from the sheath, and cut of Goliath's head.
The Scriptures states that Goliaths large shield/man was out front; and Goliath was armed with a large spear. David ran towards Goliath caught him by surprise, then David out maneuvered the shield and attacked before the spear could be employed.
Every weapon ever invented has a max. effective range: but what about the Most Effective Range! The Holy Spirit knows. "Our Weapons are not carnal." Ephes. 6 explains our weapons; and just like David, we too should be experts with them.