Armoured reserves
On June 6th, what prevented the Panzer division commanders from moving?
Invasion of Normandy
Rommel's defensive measures were also frustrated by a dispute over armoured doctrine. In addition to his two army groups, von Rundstedt also commanded the headquarters of "Panzer Group West" under General Leo Geyr von Schweppenburg (usually referred to as "von Geyr"). This formation was nominally an administrative HQ for von Rundstedt's armoured and mobile formations, but it was later to be renamed Fifth Panzer Army and brought into the line in Normandy. Von Geyr and Rommel disagreed over the deployment and use of the vital Panzer divisions. Rommel recognised that the Allies would possess air superiority and would be able to harass his movements from the air. He therefore proposed that the armoured formations be deployed close to the invasion beaches. In his words, it was better to have one Panzer division facing the invaders on the first day, than three Panzer divisions three days later when the Allies would already have established a firm beachhead. Von Geyr argued for the standard doctrine that the Panzer formations should be concentrated in a central position around Paris and Rouen, and deployed "en masse" against the main Allied beachhead when this had been identified. The argument was eventually brought before Hitler for arbitration. He characteristically imposed an unworkable compromise solution. Only three Panzer divisions were given to Rommel, too few to cover all the threatened sectors. The remainder, nominally under Von Geyr's control, were actually designated as being in "OKW Reserve". Only three of these were deployed close enough to intervene immediately against any invasion of Northern France; the other four were dispersed in southern France and the Netherlands. Hitler reserved to himself the authority to move the divisions in OKW Reserve, or commit them to action. On 6 June many Panzer division commanders were unable to move because Hitler had not given the necessary authorisation, and his staff refused to wake him upon news of the invasion.