American transportation played a crucial part in Allied logistics in the World War II Siegfried Line campaign, which ran from the end of the pursuit of the German armies from Normandy in mid-September 1944 until December 1944, when the American Army was engulfed by the German Ardennes offensive. In August 1944, the Supreme Allied Commander, General Dwight D. Eisenhower, elected to continue the pursuit of the retreating German forces beyond the Seine instead of pausing to build up supplies and establish the line of communications as called for in the original Operation Overlord plan. The subsequent advance to the German border stretched the American logistical system to its breaking point, and the advance came to a halt in mid-September.