Found this interesting video on youtube: http://www.youtube.com/watch?v=IWtBBWAiFdk
The story in the video goes something like this:
Long long ago there were two very powerful Hmong men by the name of Ntaj Koob and Lis Coo. When they died, either one of them or both of them (video didn't say which) were buried at the foot of the mountain shown in this video. The landscape of this mountain and the area around it formed the shape of a dragon. Qin Dynasty feared greatly that if they did not destroy this dragon that one day our Hmong people will raise a mighty king to conquer China and so they sought out to destroy the dragon. Chinese soldiers came everyday to dig the mountain (slay the dragon) but were unsuccessul because when they returned in the morning, the dragon healed itself. This went on for many countless nights and on one night in particular, a Chinese soldier left his shoes behind, and when he returned to fetch his shoes he overheard the two mem toj (dragons) saying to each other that the only way to destroy them was to cut it with saws. And so this soldier returned and told this to his commanders. The Chinese soldiers returned the next day with saws that were rubbed with chicken excrements and were finally able to cut the mountain after having worked non-stop for 4 days and 4 nights. Because they were successful, our Hmong people lost all hope and separated to all corners of southern China: Yunnan, Sichuan, Hunan, Guizhou, etc. never to be united again.
Quite a sad story if you ask me.