Ts'ao Ts'ao asked the others to leave the camp,Chiang Kan took out the letter and handed it to Ts'ao Ts'ao.Ts'ao Ts'ao read the letter:...We are forced to surrender to Ts'ao Ts'ao.Now we have convinced Ts'ao Ts'ao not to attack until his men are better trained.When the time is right,we will present Ts'ao Ts'ao's head to you."