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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...

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