In the weeks before D-Day, British intelligence was highly concerned about ... crossword puzzles. The London Daily Telegraph's recent puzzle answers had included Overlord and Neptune (the code names for the over-all operation and the landing operation), Utah and Omaha (the two American invasion beaches) and Mulberry (the code name for the artificial harbors planned after the invasion). Agents interrogated the puzzle-maker, a Surrey school headmaster named Leonard Dawe. Turns out, it was just a coincidence.
Michael Tercha, Chicago Tribune