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
17th Airborne Division (United States) 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. 13th Airborne Division and the 17th Airborne Division, all of which were assigned to the U.S. XVIII Airborne Corps. However, as planning for Operation Varsity began, it soon became obvious that there was a lack of suitable transport aircraft to transport all three airborne divisions. As such the 13th Airborne Division was dropped from the operational plan, primarily