Operation Pegasus launched Operation Market Garden, an attempt by the British 2nd Army to bypass the Siegfried Line and advance into the Ruhr, Germany’s industrial heartland. The operation required the First Allied Airborne Army to seize several bridges over rivers and canals in the Netherlands, allowing ground forces to advance and cross the Lower Rhine at Arnhem. The 1st British Airborne Division dropped onto Arnhem on 17 September. They encountered far greater resistance than had been expected and only a small force were able to reach Arnhem road bridge. XXX Corps ground advance became delayed and without reinforcement this small force under
13th Airborne Division (United States) subsequently authorized by Eisenhower. Plunder envisioned the British Second Army, under Lieutenant-General Miles C. Dempsey, and the U.S. Ninth Army, under Lieutenant General William Simpson, crossing the Rhine at Rees, Wesel, and an area south of the Lippe Canal. To ensure that the operation was a success, Montgomery insisted that an airborne component was inserted into the plans for the operation to support the amphibious assaults that would take place, which was code-named Operation Varsity. Three airborne divisions were initially chosen to take part in Varsity, these being the British 6th Airborne Division, the U.S. 17th Airborne Division, and finally