《资治通鉴·唐纪·唐纪五》
王世充的弟弟徐州行台王世辩派遣手下的将领郭士衡带几千兵马与窦建德会合，共十几万人，号称有三十万，在成皋东原扎营，在板渚修筑宫室，派人和王世充互通消息。
王世充之弟徐州行台世辩遣其将郭士衡，将兵数千会之，合十馀万，号三十万，军于成皋之东原，筑宫板渚，遣使与王世充相闻。
Wang Shichong's younger brother, Wang Shibian, the Xingtai of Xuzhou, dispatches his subordinate general Guo Shiheng with several thousand troops to join Dou Jiande, with a total of more than ten thousand troops, claiming to have three hundred thousand troops, and sets up camp in Chenggao Dongyuan. He builds a palace in Ban Zhu, and sends people to exchange messages with Wang Shichong.