The previous landing was at Dieppe approximately 2 years before. This was a disaster for the Allies due to poor planning and no beach reconnaissance.
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The English Channel
To hide the ships carrying the men and equipment across the English Channel.
British soldiers were transported to France during World War 1 primarily by ships. The soldiers were transported across the English Channel from various ports in England, including Southampton, Folkestone, and Dover. Once in France, they were then transported by rail to their respective deployment areas.
The same reason as Napoleon & in WW2, the difficulty of getting sufficient invading forces across the English Channel.
Hitler needed to gain air superiority over the British Royal Air Force, so he could direct an invasion force across the English Channel - he failed. He cancelled his plan to invade Britain and turned eastwards to attack Russia instead.