“春水方生,公宜速去。足下不死,孤不得安。”这是建安十八年(公元213年)三月间,孙权写给曹操的一封信。这一年,曹操为报赤壁之仇,进攻濡须口(今安徽省无为县),双方相持一个多月,吴军急寻破解之策。而曹操面对军容严整的东吴军队,亦发出“生子当如孙仲谋,如刘景升儿子豚犬耳”的感叹。眼看江南进入雨季,曹操深知不识水性的军队无法再待下去,一时打又打不赢,退又没理由。于是,聪明的孙权给曹操写了上面十六个字,也为曹操退兵搭了个很好的台阶。曹操接到信后,当众将内容 “This is Jian’an eighteen years (AD 213) in March, Sun Quan wrote a letter to Cao Cao. This year, Cao Cao reported revenge for Red Cliff, and attacked Xu Xu (now Wuwei County, Anhui Province). As the two sides stalled for more than a month, Wu Jun was keen to find a solution. Cao Cao, facing the military integrity of the Soochow Army, also issued sighs of ”having children like Sun Zhongmou, such as Liu Jingsheng’s son with a dog’s ear." Seeing the south into the rainy season, Cao Cao know that the water-borne armies can not stay any longer, temporarily hit again and again, there is no reason to retreat. Thus, the clever Sun Quan Cao Cao wrote the above sixteen words, but also Cao Cao retreat to take a very good level. Cao Cao received the letter, the public will be content