In 222 BC, Dai was conquered by the Qin army led by Wang Jian's son, Wang Jian led the Qin army stationed at Zhongshan to prepare for an offensive on Yan.
Dai was conquered by the Qin army, Wang Jian led the Qin army. This was in 222 BC. This Qin army was stationed at Zhongshan. This was to prepare for an offensive on Yan. This Qin army was led by Wang Jian's son.