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The Belgian intelligence service passed to the western Allies a copy of the original Case Yellow plan [a replay of 1914], after a Luftwaffe officer flying to one of the German Army Groups [probably ‘B’], got lost in the fog and crashed in Belgium. By the early Spring of 1940 informal talks with the Belgians had proceeded to the point where the French and Brits changed their operational plan to include the ‘Dyle maneuver’, moving the French Seventh Army to the extreme left flank to not only link up with the Dutch, but also to cover a corner of Belgium and link up with the Belgian Army. That Army came from being in reserve - behind Sedan, where my beloved Panzer Leaders [Kleist, Hoth Guderian and Rommel] came storming through. The Dutch were much closer to the Allies and somewhat more open about it [I believe a Dutch intelligence officer was captured with Stevens and Best at Venlo].