Operation Overlord was meticulously planned with the aid of Allied forces

https://page-wiki.win/index.php/The_Power_of_Persuasion:_Propaganda_That_Shaped_German_Public_Opinion_in_WW2

Operation Overlord become meticulously deliberate with the aid of Allied forces, in a roundabout way most popular to the liberation of France and crippling German defenses on the Western Front.