For the city, see Wuhu. For the history of each of the Wu Hu tribes, see Sixteen Kingdoms. Wu Hu is a collective term for various non-Chinese steppe tribes during the period from the Han Dynasty to the Northern Dynasties. These nomadic tribes originally resided outside China proper, but gradually migrated into Chinese areas during the years of turmoil between the Eastern Han Dynasty and Three Kingdoms. These non-Chinese tribes, whom the Han had fought to a standstill, seized the opportunity afforded by the weakness of the central government to extend their settlement of pastoral lands into the fertile North China Plain.
See more at Wikipedia.org...