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You have any examples of that? Feels like it could be a urban legend and searching for "British D-Day maps" on Google Images show all the maps with France being

• hef19898 7y ago
  Not at hand, but way back the day I saw some in old books covering D-Day. My uncle had one lying around where it was shown this way, no idea what the title was. But I remember it, I always turned it upside down to understand the map and then back again to read the text. Not sure if that was something that was down after the war or already during d-day, so.