With what did David first strike Goliath down?

Answer: A sling and a stone

David prevailed with a sling and a stone; then he took Goliath's own sword, killed him, and cut off his head.

“Then David reached into his bag, took out a stone, and slung it, striking the Philistine on the forehead. The stone sank into his forehead, and he fell facedown on the ground.”— 1 Samuel 17:49 (BSB)