 On 18 August 1942, a day before the Dieppe raid, 'Dieppe' appeared as an answer in a "Daily Telegraph" crossword (set on 17 August 1942) (clued "French port"), causing a security alarm.The War Office suspected that the crossword had been used to pass intelligence to the enemy and called upon Lord Tweedsmuir, then a senior intelligence officer attached to the Canadian Army, to investigate the crossword.Tweedsmuir, the son of author John Buchan, later commented