The firecracker chants are soaked in 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, protect the efforts of countless people and above all to ensure the secret and ultimate victory of the battle. The "ho do ta nao" cries of our soldiers every time they set the rhythm to pull the artillery up became words of encouragement to the soldiers to be determined to win, even if they had to "mix blood and mud" but "their livers would not waver, their wills would not be worn out". And it also became the inspiration for musician Hoang Van to write the song "Ho keo phao".