"At that time, eleven masters were chosen, master was one of them. Eleven of us, led by Huyen Quang, the master of the Vo Dang sect, followed the imperial army to the north of Yen Mon pass, to the outside of the citadel. ." Great Wall. After that, Tu Dat sent a guide. At night, when the Yuan army was sleeping soundly, eleven of us quietly went to Vuong Bao Bao's camp."