On 10 June 1944 the Special Operations Executive (SOE) and other Resistance Networks were told to find suitable large and remote fields for mass daylight parachute drops of weapons and other stores.
The first daylight drop of weapons and stores was called Operation Zebra on 25 June 1944 when 180 B-17 bombers of the USAAF with fighter escorts dropped 2,160 containers to SOE and members of the Resistance at Ain, Jura, Haute Vienna and Vercose and due to its success a larger drop by Allied aircraft called Operation cadillac took place on 14 July 1944.
Operation Cadillac consisted of 349 bombers (mostly B17’s) with 534 Allied fighter escorts during which 3,791 containers loaded with 417 tons of weapons were dropped at seven locations. (Photos Musee de la Résistance)