The link doesn’t work.
I couldn’t find the article again. In essence words like Omaha, Neptune, Overlord, and Mulberry, all code names used for the Normandy invasion, were popping up in the London Telegraph newspaper just prior to the invasion.
British intelligence went after the writer of the crossword puzzles, who was nothing more than a teacher at a boy’s school. He was rather indignant, but no one could explain the coincidental nature of the clues.
Or was it just a coincidence? It turned out recently that the teacher often used his students to suggest words for his puzzles, and put them in the crossword. Many of the students were dependents of American military. The kids may have picked up the words from parental conversations and passed the on the the teacher as suggested puzzle answers.