How did the crossword competition in the Daily Telegraph newspaper arouse suspicion in Britain’s war cabinet in the months before the June 1944 D-Day landings during the Second World War?
Answer: Answers to the newspaper’s crossword clues were also the name of code words for the D-Day invasions. ‘Utah’, ‘Overlord’, ‘Mulberry’ and ‘Omaha’, all Allied code words, were used. The newspaper’s crossword compilers were even detained and questioned by members of the MI5 security service, though it turned out to be nothing more than an incredible coincidence.
Source: D-Day by Anthony Hall