Colorado, the map is actually fairly accurate in more ways than it is not. First US Army Group does not exist, and neither do British 5th and 6th Armies. Those “higher level” commands are fictitious creations of Operation Fortitude. But on the American side, they have accurately identified 3rd and 9th Armies, and XII and XV Corps. They have also identified American 4th, 5th, 6th and 7th Armored Divisions, which will figure prominently in Operation Cobra and subsequent exploitation. All of those units will eventually be transferred to France
On the British side, they have correctly identified 1st Canadian Army under the command of Crerar. I can’t speak to the accuracy of identification of the subordinate British units in southeast Britain. I suspect many of the divisions are fictitious.
What got the Germans is that what they do know, and is true, led them to believe what the Allies wanted them to believe. The confirmed existence of units that are really there sold them on the existence of parent formations that weren’t. The Germans were led to believe those units that really exist are slated for something other than commitment to Normandy. Those formations will eventually be subject to a higher authority but not in the form the Germans believe. There will be a second army group, but not FUSAG. It will be Bradley’s 12th, which the Germans don’t see coming, created around 1st, 3rd and later 9th armies, which they have identified.
I really liked linking this map to Homer’s post of the German Transocean News Agency release from about a week ago, where the Germans pretty much publicly stated they were still quaffing the Operation Fortitude Kool-Ade.
So while the map is more accurate than not, that bit of how it’s not accurate can make a decisive difference in operations.
Absolutely fascinating stuff.
It's ironic that Ike is faithfully following Clauswitz's advice to concentrate the attack at one point and it's the Germans who think he won't.