Having reached an apparent stalemate in early 1952 around the Red River Delta, the French command again decided to go on the offensive, giving the plan the code name Operation Lorraine. On 9 November 1952, the 1st BEP and other airborne formations were dropped into combat near Phu Doan, capturing a quantity of Việt Minh supplies and securing the area. However, the operation failed in drawing the Việt Minh into a large, set-battle (as the French commanders had hoped), and as such the operation was abandoned and the remaining French forces were withdrawn on 16 and 17 November. The battalion was one of the formations selected to hold the rearguard post at Nà Sản, where it sustained a fierce assault from the Việt Minh between 23 November and 2 December 1952. The post was well-fortified and held in the face of overwhelming numbers, with the bloodied Việt Minh falling back after a week of fighting.