▁the ▁famous ▁general - s aint ▁Tr ầ n ▁H ư ng ▁ Đ ạ o . ▁ ▁In ▁the ▁T ran ▁campaign s ▁that ▁confront ed ▁the ▁S ino - M ong ol ian ▁invasion ▁of ▁Kub la i ▁Khan , ▁in ▁ 1 2 8 5 ▁and ▁ 1 2 8 8 , ▁T ran ▁T ung ▁was ▁among ▁the ▁gener als ▁who ▁rep elled ▁the ▁Mong ol ▁invas ions . ▁ ▁When ▁the ▁campaign s ▁had ▁concluded , ▁he ▁retre ated ▁from ▁world ly ▁activities ▁and ▁became ▁a ▁Buddh ist ▁pract ition er . ▁ ▁His ▁teacher ▁was ▁a ▁mon k ▁named ▁T ieu ▁D ao , ▁a ▁representative ▁of ▁the ▁Wu ▁Y ant ong ▁line age ▁of ▁Buddh ism , ▁named ▁for ▁its ▁founder , ▁a ▁student ▁of ▁Ba iz hang ▁Hu ai hai ▁who ▁had ▁come ▁to ▁Vietnam . ▁T ue ▁Tr ung ▁is ▁considered ▁T ieu ▁D ao ' s ▁best ▁pup il . ▁He ▁would ▁not ▁leave ▁home ▁for ▁monaster y , ▁but ▁his ▁vast ▁education ▁and ▁his ▁ability ▁to ▁explain ▁the ▁Buddh ist ▁doctrine ▁made ▁him ▁the ▁most ▁famous ▁Buddh ist ▁teacher ▁of ▁his ▁time . ▁ ▁In ▁his ▁turn , ▁T ue ▁Tr ung ▁made ▁his ▁spiritual ▁he ir ▁Tr ầ n ▁N h ân ▁T ô ng , ▁the ▁king ▁who ▁after ▁ab dic ation ▁founded ▁the ▁Tr ú c ▁L â m ▁( B am bo o ▁Gro ve ) ▁school , ▁the ▁tradition ▁of ▁Buddh ism ▁that ▁is ▁sometimes ▁considered ▁to