(VOVWORLD) -Co Noi T‑Junction in Mai Sơn District, Sơn La Province, used to be a key transportation point during the Dien Bien Phu campaign. It connected the northern delta, the Viet Bac war zone, and central provinces. Countless soldiers, young volunteers, and ordinary people lost their lives there to contribute to the Dien Bien Phu Victory on May 7, 1954.