Invasion of Sicily
In July 1943 US and British troops invaded the
island of Sicily and after more than a month of fighting defeated the Axis
forces and captured the island. However the German forces were able to avoid a
total defeat by retreating in an orderly fashion through the Strait of Messina.
It seems that during the fighting in Sicily the Germans managed
to capture a valid keylist of an M-209 network and thus read current US
military traffic (14).
The war diary of Inspectorate 7/VI says that in July ’43 the
captured material allowed the continuous decryption of the traffic with
indicator ‘ID’ and the results were communicated to NAAst 7.
The report of August ’43 says that messages of the ‘ID’
network could be decoded till mid month and after that it was still
possible to find several cases of indicator reuse and thus solve the traffic of
those days cryptanalytically.
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