Slings
From Tolkien Gateway
Slings were weapons of primative origin involving the hurling of small projectiles by a single strap of leather or wool. The elves of the House of the Tree in Gondolin carried these weapons, according to the Fall of Gondolin. It has been speculated that had Tolkien ever revised the Fall later in life, he would have eliminated the mention of this weapon, as it was created in some of the earliest stages of Middle-earth's evolution.
