Thanks to Dao Duy Tu, the Nguyen lords' territory grew as such. Friendship is also synonymous with fidelity. The latter was an excellent swimmer that Hung Dao Vuong assigned to guard the boat at the bank of a river during a lightning excursion on Mongol ground. Thanks to the confidence and magnanimity that Tran Hung Dao always knew how to maintain toward his subordinates, and to their infallible fidelity, he was narrowly rescued. This friendship continues to be honored up to now because we find it not only on the altar dedicated to Hung Dao Vuong the hero himself but also to his two faithful servants.
Friendship imposes duties that sometimes lead to even sacrifice.
Anh quickly made friend with him and granted him the hand of his younger sister, princess Ngo.c Du . Vo Tanh became a few years later one of Nguyen Anh's brilliant generals. That caused to mobilize for entire months, the bulk of Tay Son forces. In spite of pleas from Gia Long and his close relatives to abandon Qui Nhon, he preferred to kill himself instead of surrender at the fall of the city. Friendship is at the origin of several Vietnamese legends of which the most famous remains Luu Binh Duong Le.