According to an article from the Telegraph in 2014 and a British online history magazine, the answers included the code names of the beaches where Allied forces would eventually go ashore, including the U.S. sectors code-named Utah and Omaha, and other parts of the invasion. One puzzle included the answer “Mulberry,” likely after the artificial harbors that were to be anchored off the coast of France to help move equipment to the beaches. On May 27, another question’s solution was the code name for the entire invasion: overlord.

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It is unclear which puzzle caused investigators to track down who was writing them, but according to Historic UK, two officers were sent to Surrey, England, in May or early June to question Leonard Dawe. Dawe, 54, was headmaster of the Strand boys’ school. He denied any intent to disclose classified information and was never charged. MI5 chalked it up to coincidence. In an appended note to the article in Historic UK, however, a former student at Strand offered a potential explanation for Dawe’s inclusion of the codewords.

“Mr. Dawe was a compiler of puzzles for the Daily Telegraph and it was often his practice to call in 6th formers and ask them for words for inclusion,” Richard S. Wallington wrote to the British site. “At that time, the U.S. Forces were liberally strewn through Surrey, particularly in the Epsom area, and there is no doubt that boys heard these code words being bandied about and innocently passed them on.”