- b/ When did he win the army of French?. - He won the army of French in 1954. - b) The people’s Army of Viet Nam defeated the French in 1956.. - c) The people’s Army of Viet Nam won the battle of Dien Bien Phu.. - F_ b) The people’s Army of Viet Nam defeated the French in 1956.. - T_ c) The people’s Army of Viet Nam won the battle of Dien Bien Phu.. - C/ When did he defeat the army of French?. - D/ Where did he win the army of French?. - He defeated the army of