101st Airborne Division coast and strengthened the paratrooper positions, many were relieved and sent to the rear to organize for the next big paratroop operation. On 17 September 1944, the 101st Airborne Division became part of XVIII Airborne Corps, under Major General Matthew Ridgway, part of the First Allied Airborne Army, commanded by Lieutenant General Lewis H. Brereton. The division took part in Operation Market Garden (17–25 September 1944), an unsuccessful Allied military operation under Field Marshal Bernard Montgomery, commander of the Anglo-Canadian 21st Army Group, to capture Dutch bridges over the Rhine fought in the Netherlands and the largest airborne operation of
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