Quote: The so called "Sichelschnitt" certainly sruvived contact. It worked even better than Manstein had expected.
Perhaps the Allies simply worked worse than expected?
As for Dunkirk there are lots of contradictory explanations about that from Hitler's own WWI recollection that the terrain in the area was unsuitable for tank warfare to the very probable suggestion that the idea originated with Von Rundstedt and not Hitler. German infantry divisions largely had horse-drawn artillery and did not move anywhere near as fast as the panzer divisions. Re-grouping the panzers for a drive against France while giving the infantry time to move up their heavy guns does make some sense. Add in Goering's bullshit about the Luftwaffe's ability to prevent an evacuation and you end up with a situation of counting your chickens before the eggs hatch.