Tianzhu massacred the Tang envoy, and deputy envoy Wang Xuance escaped. After experiencing hardships, he borrowed Tibetan and Nibalo cavalry to defeat Qunv City in three battles. On the way back, a boundary monument of the Tang Dynasty was set up on the bank of the Ganges River. The south of the Ganges River belonged to Tianzhu, and the north of the Ganges belonged to the Tang Dynasty. This story has historical records, but there is no specific plot. This book is purely historical imagination, so please do not take it literally.