Once upon a time, there were two mountains. On one stood a city, and on the other the dragon.
As large as the dragon was, it was harmless, and has no intention to fight. Yet men arm themselves with swords and sticks ready to attack.
By arguing over who should be first to climb the mountain, they end up fighting each other. So the dragon continues to look on incredulously on a war that lasts for a long, long time... so long that no one even remembers why or how it started.