Tricked Hitler scatter its units all over France and the different regions of Europe, the Allies would have a small margin of time necessary to strengthen the beachhead. Therefore, it was necessary to create in the mind of the Fuhrer complex picture made up of disparate pieces of evidence that have inspired him exactly what needed allies. But, given Hitler's suspicion, it was impossible to have these tips directly pointed to the Balkans and the Pas - de - Calais, - in which case he would immediately recognize the deception. Instead, it was necessary to develop a whole system, but such that each certificate had a weight and looked like could not be more authentic. What was needed was a subtlety that in small doses to mix lies to the obvious truths. If Hitler had learned that in their projections it is fully consistent with the expectations of the Allies, his restless mind would probably have rested forever.