On 23 November 1943, 100 (Bomber Support) Group of RAF Bomber Command was formed. The object was to consolidate the various squadrons and units that had been fighting a secret war of electronics and radar countermeasures, attempting to reduce the losses of the heavy bombers ETH and their hard pressed crews ETH in Bomber Command. The book contains many first-hand accounts from pilots and crew and provides a fascinating record of 100 Group's wartime history.