'Ultra' was made possible because of help from Poland.

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‘Ultra’ was made possible because of help from Poland.  The Poles handed a replica of the Enigma to Bletchley Park in August 1939.  Without it breaking the code would have been almost impossible.

In January 1940 Alan Turing became convinced that the Poles had misinterpreted the workings of the Enigma and, after meeting them, realized that he was correct.  He then managed to crack the ‘Green’ code.

In February 1940 John Herivel thought of the idea of putting himself in an operators mind to reduce the setting possibilities.  This became increasingly more useful to cracking the Enigma.

        When Germany invaded Denmark and Norway in 1940 they used a new code; ‘Yellow’.  This was cracked in five days and as a result Station X was able to supply large amounts of information to the armed forces.  But unfortunately the armed forces did not trust the source’s reliability because Bletchley Park was top secret and couldn’t be spoken about, as well as the armed forces not trusting information coming from civilians.

        When Bletchley Park gave information to the Admiral’s Operational Intelligence Centre (OIC) in April 1940, it was ignored.  As a result Norway was invaded and Britain was caught unprepared, unable to help.  

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        In late May, 1940, Station X warned the OIC about German Warships possibly sailing into the Atlantic.  The OIC ignored it and three British ships with 1500 men were lost

        In June- September 1940 although Bletchley Park was unable to become an important park of the Battle of France or Britain, they could provide important information like the number of German aircraft lost in raids.  The most important message decoded in September was that the Germans had given up Operation Sealion, their attempt to invade Britain.

        In 1941, Bletchley Park received reports from agents about operations in the Mediterranean.   ...

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