Download or read book Decoding History written by W. Gardner and published by Springer. This book was released on 1999-09-21 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The German attack on merchant shipping in the Second World War, known as the Battle of the Atlantic, was countered partly by code-breaking intelligence known as Ultra. The dramatic revelation of this factor in the middle 1970s resulted in many works giving this as the most important cause of Allied success.