Commencing on the night of 23 March 1945, Operation Plunder was the crossing of the Rhine river at Rees, Wesel, and south of the Lippe Canal by the British Second Army, under Lieutenant-General Sir Miles Dempsey (Operation Turnscrew, Operation Widgeon, and Operation Torchlight), and the US Ninth Army, (Operation Flashpoint), under Lieutenant General William Simpson. XVIII US Airborne Corps, consisting of British 6th Airborne Division and US 17th Airborne Division, conducted Operation Varsity. All of these formations were part of the 21st Army Group under Field Marshal Sir Bernard Montgomery. This was part of a coordinated set of Rhine crossings.