The regiment regrouped on May 12, 1954, while the retrenched camp of Dien Bien Phu was falling. On the other hand, on April 16, 1954, the GM 5, composed of the 2nd and 3rd battalion of the 5e REI, endured heavy losses against a battalion at Thai Binh. Following, the Régiment du Tonkin applied the accords of the armistice and handed Hanoi to the Viet-Minh.