It was the biggest airborne campaign in history and aimed for US, British and Polish airborne troops to seize eight strategic bridges around Arnhem and Nijmegen.
If successful the daring plan could have ended the Second World War by Christmas, 1944.
But unexpected German resistance, bad weather, poor radio communications and lack of ammunition meant the operation failed amidst vast loss of life.
Nearly 6,000 from the 1st Airborne Division were captured after Arnhem and 1,750 were killed.