Bletchley Park was able to read huge numbers of enemy air force messages
This was Bletchley Park’s first substantial contribution to the British war effort. The first Enigma messages to be successfully decrypted were from the German Luftwaffe. For example the breaking by Hut 6 of the Brown Enigma cypher allowed Bletchley Park to predict the targets and routes of the Luftwaffe bombers, which ensured that RAF fighter aircraft could ambush them on their way to their targets and that the authorities on the ground could anticipate and prepare for the raids, limiting the numbers of deaths and amount of damage so far as was possible.
Later in the war, Bletchley Park decrypts made a significant contribution to the Allied bombing offensive over Germany from 1943 onwards. Interception and analysis of transmissions from the German air defence network allowed British and American bomber routes and tactics to be refined, to minimise losses. False broadcasts were also made to confuse the enemy system.