The firecracker chants are soaked with sweat, tears and blood.

During the Dien Bien Phu campaign, artillery pieces weighing tons were pulled up to the high mountain battlefield with only the shoulders and hands of soldiers and their determination. Many examples of heroic sacrifices were made to protect the artillery, to protect the efforts of countless people and above all to ensure the battle was secret and victorious until the end. The "ho do ta nao" cries of our soldiers every time they started to pull the artillery up became words of encouragement for the soldiers to be determined to win, even if they had to "mix blood and mud" but "their courage did not waver, their will did not wear out". And also became the inspiration for musician Hoang Van to write the song "Ho keo phao".