The 10000 year war, the great conflict between the elves and dwarves stretching back into time primordial might never have ended if not for The udukthir. Last surviving generals of the dwarvin armies.
United under Durrimind’s banner the iron fist of the Udukthir marched into the heart of the crucible of war with one million dwarfs. Only 100 marched out again, but when they did the war was over.
(this is a dwarvin account. Most other histories tell that after the Udkthir marched, the elves and dwarves reached a mutual surrender to avoid scorching the entire world and the entire history of their peoples)