First Allied Airborne Army divisions were initially chosen to take part in Varsity: the British 6th Airborne Division, the US 13th Airborne Division and the US 17th Airborne Division, all of which were assigned to US XVIII Airborne Corps. One of these airborne formations, the British 6th Airborne Division, was a veteran division; it had taken part in Operation Overlord and the assault on Normandy. However, the 17th Airborne Division had only been activated in April 1943 and had arrived in Britain in August 1944, too late to participate in Operation Overlord. The division had also been absent from Operation Market-Garden, and the only
Operation Rösselsprung (1944) Luftwaffe aircraft in the skies over Yugoslavia. This offensive included over one thousand sorties by the newly formed Balkan Air Force. A costly ground attack was also launched by a combined Partisan, British and US force on the German-held Dalmatian island of Brač. Code-named "Operation Flounced", the assault was mounted from the British-held island of Vis further out in the Adriatic Sea on the night of 1/2 June. Fighting continued late into 3 June 1944 and resulted in the reinforcement of the island by a further 1,900 German troops. The assault force on Brač consisted of 13 battalions from the