As the
state of Chu expanded westward up the Han and Yangtze valleys it pushed the people of Ba westwards towards Shu. In the 5th and 4th centuries BC in Sichuan archaeologists hold that this interaction helped create
Ba–Shu culture. The
tiger was an important part of Ba mythology, with the
white tiger being held in highest esteem. According to legend, the first king of Ba, Lord Lin, transformed into a white tiger upon his death. Warfare played an important role in Ba society. Their warriors were often employed as mercenaries by other states; they played a role in the defeat of
Xiang Yu by Liu Bang (later
Emperor Gaozu of Han), and later served the
Han dynasty. Weapons were prevalent in Ba grave goods, some with distinctive curved blades. Other distinctive features of Ba culture are their boat-shaped coffin burials, and they used Ba-style bronze drums (, similar to
Đông Sơn drums), topped with the figure of a tiger, to communicate in battle. As in other states of ancient China, they made beautiful bronze
dings or
sacrificial tripods, sometimes with writing on them. The Ba people were known for the musical abilities and gave the Chinese a distinctive dance style and music that was popular for many centuries after the state had ceased to exist. The dance, called
Ba Yu (, later renamed the
Zhaowu, ) dance, was first brought to prominence by Emperor Gaozu of Han, who enjoyed their war dances. Large-scale performances of the dance involved the brandishing of various weapons to the accompaniment of drums and songs in the Ba language. It remained popular through the
Tang dynasty and spread as far as Central Asia. The Bashu culture developed writing systems with symbols that appear to be unrelated to
Chinese characters. Three
Ba–Shu scripts have been found on bronzeware, none of which have been
deciphered. One apparently
pictographic script was used to decorate weapons found in Ba graves in eastern Sichuan. The second script is found in both western and eastern Sichuan, on weapons, a belt buckle and on the base of a bronze vessel. Some scholars believe this script to be
phonetic, pointing to similarities between some of the symbols and symbols of the later
Yi script. The third script (possibly also phonetic) is known only from an inscription on the lid of a bronze vessel found in a grave in Baihuatan,
Chengdu. ==Ba in astronomy==