Before the D-Day invasion Rommel and Von Rundstedt had differing opinions on strategy. Rommel wanted to keep Panzer forces near the possible landing spots and hit the Allies right when they started the invasion on whatever beach it was to be. Von Rundstedt thought it would be wise to keep the Panzers outside of Paris, and call them in when they knew where the real landing zone was. Hitler compromised both by keeping Panzer forces close in reserve, but only he could decide when to deploy them. If Rommel won the argument and was able to keep substantial Panzer forces near Normandy, could the Germans have succeeded in knocking the Allies back to the sea, and a failure to gain a toehold in France? I also read that Speidel had 3 Panzer divisions near the Normandy front but purposely held them back so the Allies would have more success, because he was in on the Valkyrie plot, and wanted to make the German situation as dire as possible so the attempt on Hitler's life and overthrow seemed urgent and necessary.