World War II Top Secret D‑Day Map of the French North Coast
By THEATRE INTELLIGENCE SECTION, 1944
Cape Levi to Fecamp [Bombardment Chart].
- Author: THEATRE INTELLIGENCE SECTION
- Publication place: London
- Publisher: British Hydrographic Office of the Admiralty
- Publication date: 14 March 1944.
- Physical description: Chromolithograph chart mounted on linen, manuscript notation in upper right corner “Copy No. 9.15”. With tape mark residue to left and right of chart.
- Dimensions: 740 by 1090mm. (29.25 by 43 inches).
- Inventory reference: 14876
The Theatre Intelligence Section of the Director of Naval Intelligence had a series of these French navigational charts printed in light blue and overprinted in black to indicate enemy gun positions, details of calibre, and ranges. These charts were part of the top secret materials related to the Neptune phase of Operation Overlord entitled “Top Secret. ON.1. Appendix VII. Annexe C. Text and Diagrams of Neptune Batteries”. The archive includes an 88-page booklet issued by Rear-Admiral Alan G. Kirk, folios of shoreline sketches, charts, and maps.
Operation “Overlord” was part of a large strategic plan designed to bring about the defeat of Germany by heavy assaults on German-occupied Europe from the United Kingdom, the Mediterranean and Russia. The outline of the Operation ‘Overlord’ plan was completed in July 1943, and the particular assault on the Normandy beaches from the UK and the English Channel elaborated under the title of Operation “Neptune” in February 1944. “Neptune” involved preparatory aerial and naval bombing of German coastal positions, before the historic landings of D‑Day itself: the largest amphibious operation in history, and a pivotal moment in the course of the Second World War which eventually resulted in the liberation of western Europe from German occupation.
The chart shows each of the beaches that were taken by Allied troops during the Operation Overlord landings on June 6, 1944 – Utah, Omaha, Gold, Juno and Sword. It also includes a sixth beach code-named “Band”. The plan was to bombard this beach if the German gun battery at Merville could not be taken.
In addition to the clearly labelled beaches, the map identifies every known German artillery position defending the beaches, with each given a colour-coded dot according to type and calibre. Around these dots a series of coloured rings indicate the position’s maximum range and degree of rotation, which would have informed the ships of the best approaches and routes to avoid.
A legend at bottom left provides a list the calibre and ranges of the German guns and a key to the various types of emplacements and radar installations. The chart also notes that there is accompanying text in Annexe C, part of the greater Neptune monograph.
The National Maritime Museum has a bound folder of the Neptune monograph (CAZ/29).
Rear Admiral George B.H. Stallings served in the Navy Department’s Bureau of Ordnance during World War II from 1941 to 1944. He was then chief of staff to CBD5 in the USS Texas BB35 for the invasion of Omaha Beach in Normandy on 6 June 1944, as well as in Southern France and Iwo Jima from 1944–1945. He was chief of staff to CBD4 in the USS West Virginia BB48 for the invasion of Okinawa and the surrender of Japan in 1945.