 Concerned about German counter-attacks and the limited materiel arriving in France, he decided to continue operations on a broad front rather than attempting narrow thrusts.The linkup of the Normandy forces with the Allied forces in southern France occurred on 12 September as part of the drive to the Siegfried Line.On 17 September, Montgomery launched Operation Market Garden, an unsuccessful attempt by Anglo-American airborne troops to capture bridges in the Netherlands to allow ground forces to cross the Rhine into Germany.