Entre 1914 et 1918, près de 200 000 tirailleurs africains se battent dans l'armée française. Parmi eux, un père et son fils.
1917. Bakary Diallo enlists in the French army to join his 17-year-old son, Thierno, who has been forcibly recruited. Sent to the front, they will have to face the war together. While Thierno learns to become a man, Bakary will do everything to bring him back safely.