In 1259, her father was one of the commanders of the chinese army fighting off the Mongols besieging the Diaoyu Fortress. He died saving the fortress from a mongol assault and Zhang found his body with other corpses. Kang, her father's Mentor, completed Zhang Zhi's training despite his doubts about her motives, warning her that revenge had to come after duty. She later disobeyed the Mentor, infiltrating the Mongol camp and killing Möngke Khan.
However, while returning to the fortress, Zhang Zhi was injured and became crippled. Kang informed her that she would never be formally inducted into the Brotherhood and left.