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Land

Intelligence from Bletchley Park was vital in the Allies’ land battles

It was in North Africa where Bletchley Park came into its own, assisted by its outpost in Cairo, the Combined Bureau Middle-East. Enigma decrypts provided vital intelligence to the British generals throughout the campaign. The Codebreakers also made a vital contribution to D-Day. The ability to read Japanese diplomatic and naval and military attaché cyphers provided military commanders with full details of the German defences in Normandy. The ‘Fish’ enciphered teleprinter links from Berlin to the the battle fronts also gave details of German plans laid down by Hitler and passed to his commanders.

The breaking of the ciphers of the German Secret Intelligence Service allowed the British to confuse Hitler over where the Allies were to land. His decision to divert troops away from the Normandy beaches undoubtedly helped secure the invasion’s success.

General Dwight D. Eisenhower, Supreme Allied Commander of Allied forces wrote:

‘The intelligence which has emanated from you before and during the campaign has been of priceless value to me. It has simplified my task as a commander enormously. It has saved thousands of British and American lives…’

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Sea

Breaking German, Italian and Japanese naval codes was vital to the war effort

Sea

Breaking German, Italian and Japanese naval codes was vital to the war effort