《三国志·魏书·二公孙陶四张传》
刘虞上任后就撤回了各路驻扎的队伍，只留下公孙瓒率领一万多步兵骑兵驻守在右北平。
虞上罢诸屯兵，但留瓒将步骑万人屯右北平。
After taking office, Liu Yu recalled the various armies that had been stationed and left only Gongsun Zan with over ten thousand infantry and cavalry guarding Youbeiping.