To show his gratitude, Cao Cao conferred upon Li Tong the title Lord Who Renders High Services, and confirmed him in his command as the defense of Runan against Liu Biao and Zhang Xiu. Then Li Tong expressed his thanks and took his leave. On his return to the capital, Cao Cao presented a memorial on the good services rendered by Sun Ce, and the Emperor made him Lord of Wu ((an ancient state)) with the title General Who Destroys Rebels. The messenger bearing the decree bore also the order to repress Liu Biao.
Cao Cao went to his palace and there received the ceremonial calls of congratulation. These finished, Xun Yu asked, saying, “You, Sir, marched very leisurely to Anzhong; how came it that you felt certain of victory?”
Cao Cao replied, “My soldiers, who retire and find their retreat cut off, fight vigorously and desperately. I retired slowly to entice the enemy into following whereby I could do as I wished with them. Basing my movements on these considerations I felt secure.”
Xun Yu bowed his head in admiration.
When Guo Jia entered, Cao Cao said, “Why so late, Sir?”
The visitor drew a letter from his sleeve, saying to his master, “Yuan Shao sends this expressing he desires to send an army to attack Gongsun Zan and wishes you to lend provisions and troops.”
“I heard Yuan Shao was going to attack Xuchang; I suppose my return has made him change his intention,” said Cao Cao.
Then he opened the letter and read it. It was couched in very arrogant terms.
“Yuan Shao is so exceedingly rude that I will attack him,” said Cao Cao. “Only I think I am not quite strong enough. What should be done?”
Guo Jia said, “My lord, you know well who lost, and why, in the conflict between Liu Bang, the Supreme Ancestor, and Xiang Yu, his rival; the former won only by superior wisdom. Xiang Yu was the stronger, but in the end he was overcome. Your rival has ten weak points whereas you have ten strong ones, and, though his army is large, it is not terrible.”
Then Guo Jia continued, “Yuan Shao is overmuch devoted to ceremony and deportment; while you are sympathetic and natural; this is an excellence in conduct. He is antagonistic and drives; you are conciliatory and lead; so you have the advantage of popular approval. For many years the government has been lax, and he makes it more so; you strive vigorously after efficiency; this is the excellence of able administration. He is outwardly liberal but grudging at heart, and too given to nepotism; you appear exacting, but you understand and use people after their ability; this is the advantage of correct appreciation. He is a visionary but lacking in decision; you are a man of prompt decision and direct action; this is an advantage in policy. He loves to gather about him people of renown; you treat people as you find them regardless of their reputation; this is where you excel in moral virtue. He is compassionate to those at hand, but careless about those out of sight; your care is all-embracing; this is where you excel in humanity. He lends a ready ear to calumny and is misled; you may be flooded with evil counsel, but you preserve independence; this is where you excel in perspicacity. His sense of right and wrong is confused; your appreciation is accurate and clear; this is where you excel in administrative capacity. He loves the make-believe force, but is ignorant of military essentials; you would overcome with far inferior numbers as you possess military genius; this is where you excel in war. With your ten superiorities, you will have no difficulty in overcoming Yuan Shao.”
“How can I be worth as much as you say?” said Cao Cao, smiling.
“What Guo Jia has said about the ten points in your favor agrees exactly with what I think,” said Xun Yu. “Yuan Shao's army is not formidable in spite of its size.” “The real and dangerous enemy is Lu Bu,” said Guo Jia. “When Yuan Shao has gone north to destroy Gongsun Zan, we ought to sweep away Lu Bu and so clear away our danger from that side; for if this is not done, our attack on Yuan Shao will be the signal for an attempt on the capital. That would be most serious.”
Cao Cao saw things in the same light as his advisers and began to discuss plans for an attack on Lu Bu. Xun Yu was of opinion that they should first secure the fidelity and aid of Liu Bei. So letters were written, and they waited his assurance before moving a soldier. Then, in order to reassure Yuan Shao, his emissary was treated with great kindness, and a memorial presented to the Emperor asking extra honors for him. Yuan Shao was made Imperial Protector of the four northern regions — Jizhou, Qingzhou, Youzhou, and Bingzhou. With all this a private letter was written by Cao Cao urging upon him to attack Gongsun Zan and promising assistance. So Yuan Shao's army started.