In 205 BC, after establishing his base in Guanzhong, Liu Bang advanced to the east of Hangu Pass to prepare for an attack on the Henan region. Sima Xin (King of Sai), Dong Yi (King of Di) and Shen Yang (King of Henan) surrendered to Liu Bang. Zheng Chang (King of Hán) refused to submit to Liu Bang and was defeated by Han Xin in battle. Liu Bang replaced Zheng Chang with Hán Xin as the new King of Hán. Zhang Er (former King of Changshan) came to join Liu Bang after losing his domain to Zhao Xie and Chen Yu.