Also in September 1944, the Allies having outrun their logistic tail (the "Red Ball Express"), the front stabilised along Belgium's northern and eastern borders and in Lorraine. From then on it moved at a slower pace, first to the Siegfried Line and then in the early months of 1945 to the Rhine in increments. For instance, the Ist Corps seized the Belfort Gap in a coup de main offensive in November 1944, their German opponents believing they had entrenched for the winter.