Guo Tu
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: