▁conduct ▁ra ids . ▁In ▁the ▁name ▁of ▁qu elling ▁local ▁dist urban ces , ▁Z hang ▁J ing ▁committed ▁ 5 1 , 0 0 0 ▁troops ▁to ▁dis l odge ▁the ▁Y ao ▁and ▁the ▁band its ▁from ▁the ▁g orge ▁in ▁ 1 5 3 9 , ▁and ▁took ▁up ▁to ▁ 1 , 3 5 0 ▁heads ▁in ▁the ▁operation ▁while ▁receiving ▁the ▁surrender ▁of ▁three ▁thousand ▁men ▁and ▁women . ▁The ▁operation ▁brought ▁some ▁degree ▁of ▁M ing ▁control ▁to ▁the ▁R attan ▁G orge ▁area ▁and ▁demonstrated ▁Chinese ▁military ▁might ▁to ▁neighbour ing ▁Vietnam , ▁itself ▁on ▁the ▁ver ge ▁of ▁war ▁with ▁China . ▁ ▁In ▁Vietnam , ▁the ▁M ing ▁trib ut ary ▁state ▁ruled ▁by ▁the ▁L ê ▁dynast y ▁was ▁over th rown ▁by ▁M ạ c ▁ Đ ă ng ▁D ung ▁in ▁ 1 5 2 7 ▁and ▁declared ▁himself ▁em peror ▁of ▁a ▁new ▁M ạ c ▁dynast y . ▁The ▁M ing ▁court ▁in ▁Be ij ing ▁s ided ▁with ▁the ▁ou sted ▁L ê ▁house ▁and ▁wished ▁to ▁pun ish ▁the ▁us ur per ▁by ▁sending ▁an ▁expedition ary ▁force ▁into ▁Vietnam ▁in ▁ 1 5 3 8 . ▁Z hang ▁J ing , ▁being ▁ac utely ▁aware ▁of ▁the ▁situation ▁on ▁the ▁ground , ▁mem orial ized ▁the ▁throne ▁against ▁war , ▁arg uing ▁that ▁the ▁man power ▁and ▁resources ▁of ▁his ▁territorial ▁command ▁could ▁not ▁support ▁such ▁a ▁campaign . ▁The ▁J ia j ing ▁em