I recently had the pleasure of visiting Southwick House, located on the southern coast of England. From the outside, it looks like many other quaint English country homes, yet this is where the Allied Supreme Command, led by General Dwight D. Eisenhower, planned the greatest naval invasion in history—D-Day.

Stepping into the room where those leaders talked, debated, and strategized was a moving experience. The real highlight, however, was the enormous map, which covers an entire wall and is dotted with markers. The photo does not quite convey the scale, but to give you an idea, the bollards in front of the map are typically waist-height, offering a sense of the map’s vastness.

Remarkably, the map has remained almost completely untouched since those critical days in 1944. It shows an array of details, including routes, tides, minefields, and ships, all of which had to be meticulously considered for the plan to have any chance of success.

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One thing that particularly struck me was the extent of the German mine-laying in the English Channel. While it seems obvious in hindsight, I had never fully appreciated the sheer scale of it. You can see it represented on the map as a white strip stretching from near Calais (top right of the map) all the way to where the approaches to the famous beaches are marked. In the early hours of 6th June 1944, mine-clearing operations were already well underway before the invasion even began.

Another fascinating, and somewhat amusing fact I learned was that a toy company was commissioned to make the map. Initially, the Allies requested a map covering all of Europe, from Portugal to Norway, to ensure the secrecy of the invasion’s exact location. However, when the map was delivered, Eisenhower instructed two carpenters to cut out the portion he needed, focusing on southern England and Normandy. At that point, it became obvious to the carpenters where the invasion was going to take place. As a precaution, they were not allowed to return home or contact their families for nine months, other than to explain they were ’doing very important work’. This was to ensure they couldn’t leak any details.

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