The Shanyue (山越) were an ancient conglomeration of upland Yue hill tribes living in what is today the mountainous regions of Southern China and Northern Vietnam during the Han dynasty.
As the Han imperial court only claimed ownership of the territories of the southern portions, the empire lacked the military means to realistically control and subdue them prior the southward expansion.
To ensure a sustainable source of livelihood to support their survival, the Shanyue would regularly conduct sneak attacks and perform rebellions against any unfortunate Han Chinese wanderer that crossed paths with them by lurking around their domains to loot and gather rudimentary living essentials.
The military operation ran for approximately three to four years, with virtually all the Shanyue tribes within Dangyang having surrendered to the Kingdom of Wu, indicative of their final acquiescence to have their eventual fates to be assimilated into the Han empire.
The Three Kingdom's immense imperial military power coupled with its vast strategic intensification of internal Han Chinese migratory pressures ultimately led to their eventual demographic displacement and territorial dispossession.