Allied Forces on D-Day Used a Popular Tourist Guide to Help Liberate France

When Allied troops landed in France on June 6, 1944, they weren't looking for France's best restaurants. Still, they were carrying copies of the world's foremost tourism and travel book.
Fearful the Nazis would destroy road signs in their retreat, Allied commanders needed the most up-to-date maps available before the invasion and did anything they could to get the best information. They didn't want their advances to get bogged down just because they were on unfamiliar ground.