C203 The Development of Cao Cao's Army

In the Battle of Guandu, Yuen Shao had lost about seventy to eighty thousand soldiers. He had also lost a lot of grain, weapons, and supplies, as well as books and treasures that Cao Cao had not been able to take away from the city. After Yuen Shao returned to his territory, he wrote a letter to Cao Cao, saying that he had lost the will to fight for supremacy