郭圖
In the next month, Cao Cao turned north to attack Nanpi and Yuan Tan came out to fight. The casualties were high on both sides, and Cao Cao contemplated a temporary truce. Cao Chun, the head of Cao Cao's Tiger and Leopard Cavalry (虎豹騎) force, dissuaded him from taking such a decision, apparently aware of Cao Cao's difficulties that Guo Tu had pointed out to Yuan Tan: