legacytotwoofhissonstheeldestson，Yuan Tan and the youngest son，yuan Shang.ashehaddesignatedtheyoungestson，yuanson as his successor ratherthantheeldestastraditiondictated，thetwobrothersconsistentlyfeudedagainsteachother， astheyfoughtcaocao.becauseoftheirinternaldivisions， caocaowaseasilyabletodefeatthembyusingtheirdifferencestohisadvantage.henceforthcaocaoassumedeffectiveruleoverallofnorthern na。dextendedhiscontrolpastthegreatwallintonorthernkorea， andsouthwardtothehanriver.however caocao ' sattempttoextendhisdominationsouthoftheyangtzeriverwasunsuccessful.hereceivedaninity ruler of Jing Zhou，died，and his successor，Liuzongsurrenderedtocaocaowithoutresistance.Delightedbythisturn-out。adevotedfollowerofsuntzu ' sartofwar是also considered ' defeatingyourenemywithoutbattle ' tobethehighestformofachievementofwar ) hepressedonandhopedthesamewouldhappendespitetheobjectionsbyhismilitaryadvisors.hisforceswerethendefeatedbythefirstcoalition hii UAN (wholaterfoundedthekingdomsofshuandwurespectively ) attheredcliffsin 208。

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