It's the 76th anniversary of the D-Day Landings today - Operation Overlord. This is the largest invasion ever assembled. It involved 12 Allied countries -156,000 troops in total from sea and air.
The 'D' in D-Day actually stands for 'Day' so it really reads 'Day-Day' and is used to describe the first day of a large military operation.
Operation Overload took years to plan, starting after the Dunkirk evacuations in 1940. The first plans were not submitted until July 1943. Deception plans went into motion to draw Germany away from the activity stepped up in Britain, where factories increased production to build up the resources needed. The deception included, inflatable dummy tanks replacing real tanks (pic 3) so they could be moved and a fictitious First US Army Group based in the South-East to make Germany think the Allies had more troops than they did. Southwick House (pic 4) near Portsmouth became the temporary headquarters. A Royal Navy carpenter was summoned to put a wooden map on the wall, he was unaware he would not be allowed to leave due to the high levels of secrecy and it's reported he was locked up there for 6 months. A storm postponed the landings by 24 hours and brought down a telecommunications cable. An engineer was called to fix it and ended up being locked up as well, no one knew if he was supposed to be home for his dinner. The original planning map (pic 5) was made by the toy maker Chad Valley (a recognisable name to a lot of parents). Lest we Forget
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