Renowned strategist under Cao Cao, whose brilliant insights guided many of Cao Cao's decisive victories against rival warlords, including Liu Bei, Lü Bu, and the Yuan family.
After the disastrous Battle of Red Cliffs, Cao Cao deeply mourned Guo Jia's death, lamenting, "If only Guo Jia were still alive, I would not have suffered such a fate!"
Source: Sanguozhi, Book of Wei, Volume 14: Biography of Guo Jia
