Oslo Report

The Oslo Report was one of the most spectacular leaks in the history of military intelligence. Written by German mathematician and physicist Hans Ferdinand Mayer on November 1 and 2, 1939 during a business trip to Oslo, Norway, it described several German weapons systems, current and future.

Mayer mailed the report anonymously in the form of two letters to the British Embassy in Oslo, where they were passed on to MI6 in London for further analysis, and proved to be an invaluable resource to the British in developing counter-measures, especially to navigational and targeting radars, and contributed to the British winning the Battle of Britain.

Read more about Oslo Report:  Background, British Reaction, Report Contents, Divulging The Report and The Author

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