sentences:  In 10 days, Việt Minh forces not only took Nghĩa Lộ but also seized part of Sơn La and Lai Châu from French control.To avoid further losses, General Salan launched Operation Lorraine to relieve the Việt Minh pressure in the T'ai region and to serve as a diversion while Nà Sản was being built.The operation, led by General François de Linares, started on 9 November and lasted until 19 November.