 The Wehrmacht began to reorganize itself along a defensive front known as the Siegfried Line.Eisenhower felt that he could relieve the supply problem by using Antwerp to unload supplies in Europe; however, German troops held the Scheldt estuary and consequently Allied shipping could not get through to the Belgian port city.In an effort to open the Scheldt estuary, Eisenhower approved Field Marshal Bernard Montgomery's Operation Market Garden, which was launched on 17 September.