郭嘉
After this, Cao Cao returned to the North China Plain after a particularly difficult withdrawal from Liucheng, where the coldness of early winter, shortage of food, and drought all took their toll on Cao Cao's men. Guo Jia, whose advice immensely helped Cao Cao's cause, and the former warlord Zhang Xiu were among those who perished during this campaign. Upon his return, Cao Cao rewarded and complimented the counsellors who had advised against the Wuhuan campaign earlier, acknowledging that the venture had been dangerous and risky and he had been blessed by fortune. Indeed, Liu Bei had tried to persuade Liu Biao to attack while Cao Cao was away in the north. However, as Guo Jia predicted, Liu Biao did not seize the opportunity and later regretted this decision.