The Heaven Sword and Dragon Saber
Guo Jing uses his knowledge and experience from his earlier campaigns to counter the Mongol invasion. It is revealed in "The Heaven Sword and Dragon Saber" that Xiangyang eventually falls to the Mongol invaders, and that Guo Jing and his family died in the battle. Only Guo Xiang survived, and she founded the Emei Sect later.