Talk:Timeline of World War II (1940)
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The 14 April date is not mentioned in any of the articles on Bletchley Park/Enigma/Ultra, and I cannot find any basis for that as the first successful decryption or any other specific breakthrough. The date seems plausible, and I am loathe to simply delete it before someone (hopefully watching this page) has a chance to respond. Robert A.West (Talk) 14:19, 2 April 2015 (UTC)