Heinz Guderian was consulted by Erich von Manstein when he was developing what became known as the Manstein Plan ( 1940 ).


Manstein asked me if tank movements would be possible through the Ardennes in the direction of Sedan. He explained his plan of breaking through the extension of the Maginot Line near Sedan, in order to avoid the old-fashioned Schliefien plan, familiar to the enemy and likely to be expected once more. I knew the terrain from World War I, and, after studying the map, confirmed his view. Manstein then convinced General von Rundstedt and a memorandum was sent to O.K.H. (on December 4th). O.K.H. refused to accept Manstein's idea. But the latter succeeded in bringing his idea to Hitler's knowledge.

http://www.spartacus.schoolnet.co.uk/GERguderian.htm

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