The Longest Day is a 1959 book by Cornelius Ryan telling the story of D-Day, the first day of the World War II invasion of Normandy. It details the coup de main operation by gliderborne troops, which captured the Caen canal and Orne river bridges (Pegasus Bridge and Horsa Bridge) before the main assault on the Normandy beaches. It sold tens of millions of copies in eighteen different languages. It is based on interviews with a cross-section of participants, including U.S., Canadian, British, French and German officers and civilians. Overview The book begins and ends in the village of La Roche-Guyon. The book refers to the village as being the most occupied village in occupied France and states that for each of the 543 inhabitants of La Roche-Guyon there were more than three German soldiers in the village and surrounding area. Field Marshal Erwin Rommel commander-in-chief of Army Group B had his headquarters in the castle of the village which was the seat of the Duc de La Rochefoucauld. Ryan's book is divided into three parts: the first part is titled "The Wait", the second part is named "The Night" and the third part is named "The Day". The book includes a section on the casualties of D-Day and also lists the contributors including their service details on the day of the invasion and their occupations at the time the book was first published. Ryan dedicated his book for all the men of D-Day. Researchers spent almost three years locating survivors of D-Day and over 3000 interviews were undertaken in the United States, Canada, Great Britain, France and Germany. 383 accounts of D-Day were used in the text of the book. Senior Allied officers who assisted the author included General Maxwell D. Taylor, Lieutenant General James M. Gavin, Lieutenant General Sir Frederick E. Morgan and General Sir Richard Nelson Gale. German officers who assisted with the book included Generaloberst Franz Halder, Hauptmann Hellmuth Lang and General der Infanterie Günther Blumentritt. The author also used Allied and German post action reports, War diaries, histories and official records. On 6 June 1965, the author published an article "More of The Longest Day" in Reader's Digest as a supplement. Editor Peter Schwed gave the book its title from a comment made by the German field marshal Erwin Rommel to his aide Hauptmann Helmuth Lang on April 22, 1944: "...the first 24 hours of