So this is one of those historic dates that seems to be slipping faster and faster out of sight, receding into a past at such a rate that we who were born afterwards, or long afterwards, can just barely see. But it was such an enormous, monumental enterprise – so longed looked for, so carefully planned and involved so many soldiers, sailors and airmen – of course the memory would linger long afterwards.

Think of looking down from the air, at that great metal armada, spilling out from every harbor, every estuary along England’s coast. Think of the sound of marching footsteps in a thousand encampments, and the silence left as the men marched away, counted out by squad, company and battalion, think of those great parks of tanks and vehicles, slowly emptying out, loaded into the holds of ships and onto the open decks of LSTs. Think of the roar of a thousand airplane engines, the sound of it rattling the china on the shelf, of white contrails scratching straight furrows across the moonless sky.

Think of the planners and architects of this enormous undertaking, the briefers and the specialists in all sorts of arcane specialties, most of whom would never set foot on Gold, Juno, Sword, Omaha or Utah Beach. Many of those in the know would spend the last few days or hours before D-day in guarded lock-down, to preserve security. Think of them pacing up and down, looking out of windows or at blank walls, wondering if there might be one more thing they might have done, or considered, knowing that lives depended upon every tiny minutiae, hoping that they had accounted for everything possible.

Think of the people in country villages, and port towns, seeing the marching soldiers, the grey ships sliding away from quays and wharves, hearing the airplanes, with their wings boldly striped with black and white paint – and knowing that something was up – But only knowing for a certainty that those men, those ships and those planes were heading towards France, and also knowing just as surely that many of them would not return.

Think of the commanders, of Eisenhower and his subordinates, as the minutes ticked slowly down to H-Hour, considering all that was at stake, all the lives that they were putting into this grand effort, this gamble that Europe could be liberated through a force landing from the West. Think of all the diversions and practices, the secrecy and the responsibility, the burden of lives which they carried along with the rank on their shoulders. Eisenhower had in his pocket the draft of an announcement, just in case the invasion failed and he had to break off the grand enterprise; a soldier and commander hoping for the best, but already prepared for the worst.

Think on this day, and how the might of the Nazi Reich was cast down. June 6th was for Hitler the crack of doom, although he would not know for sure for many more months. After this day, his armies only advanced once – everywhere else and at every other time, they fell back upon a Reich in ruins. Think on this while there are still those alive who remember it at first hand.