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Arthur Scherbius offered Enigma Machine to the German Navy.
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The Enigma machine began to be used by the german Navy which started to develope keys for their codes.
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Enciphered radio signals were detected by the Poles. Although they attempted to crack these codes, they were unsuccessful.
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The Germans modified the version of their Enigma Machine to include a plugboard and introduced them to the german army.
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The Polish Cipher Bureau hired Jeny Wzycki, Henryk Zygalski, and Marian Rejewski to work on cracking the German Enigma codes.
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A radio comunication network began to be used in the Air Force to help with the war effort.
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The number of possible pairs of letters going through the Enigma machine was increased.
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The British moved all sections of intelligence to Bletchley Park.
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A new version of the Enigma machine that had 4 rotors instead of 3 was now used exclusivly for the U- baots. This caused more dificulty for the Ally codebreakers.
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The Germans changed the method of sending signals through the machine which caused problems in Bletchley.
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