Trench tactics - The core element of Dien Bien Phu victory

70 years ago, with an important strategic position, Dien Bien Phu was built by the French army into a powerful stronghold, which the French called an "Impregnable Fortress"... a trap to crush the main force of the Viet Minh. Faced with developments on the battlefield, the Campaign Command decided to change the combat motto from "fight fast, win fast" to "fight steady, advance steady". Along with that, the direct assault style was changed to encirclement and encroachment, digging trenches close to the enemy's stronghold. Trench tactics were the core factor contributing to the Dien Bien Phu victory of the Vietnam People's Army.