Used more than 2000 extras, a record number for a Vietnamese film.
Released in 2010 as one of a number of events to commemorate the 1000th anniversary of the Vietnamese capital city of Hanoi.
To guarantee the film's success, the director invited dozens of scholars, historians and advisers who are experts in these periods. The filmmakers also spent three years researching the life of King Quang Trung to ensure historical accuracy for their film.