After sweeping through France and Belgium in the summer of 1944, the Allies were poised to enter the Netherlands. British Field Marshal Sir Bernard Montgomery favoured a single thrust north over the branches of the Lower Rhine River, allowing the British Second Army to bypass the Siegfried Line and attack the Ruhr. To this end, the Allies launched Operation Market Garden on 17 September. Airborne troops were dropped in the Netherlands to secure key bridges and towns along the Allied axis of advance. Farthest north, the British 1st Airborne Division, supported by men of the Glider Pilot Regiment and the 1st Polish Parachute Brigade, landed at Arnhem to secure bridges across the Nederrijn. Initially expecting a walkover, British XXX Corps planned to reach the British airborne forces within two to three days.
The British forces landed some distance from their objectives and were quickly hampered by unexpected resistance – especially from elements of the 9th SS and 10th SS Panzer Divisions. Only a small force was able to reach the Arnhem road bridge while the main body of the division was halted on the outskirts of the city. Meanwhile, XXX Corps was unable to advance north as quickly as anticipated due to the destruction of the bridge at Son, and failed to relieve the airborne troops according to schedule. After four days, the small British force at the bridge was overwhelmed and the rest of the division became trapped in a small pocket north of the river – where they could not be sufficiently reinforced by the Poles or XXX Corps when they arrived on the southern bank, nor by the RAF’s resupply flights. After nine days of fighting, the shattered remains of the airborne forces were withdrawn in Operation Berlin.
With no secure bridges over the Nederrijn, the Allies were unable to advance further and the front line stabilised south of Arnhem. The 1st Airborne Division had lost nearly three-quarters of its strength and did not see combat again (Font Wikipedia).