My turn now
What if v.Manstein's relief operation had succeeded after all and made contact, and a substantial part of the troops trapped managed to escape thtough the open corridor?
What if v.M. managed to establish a suitable defensive position, reinforced by the extra troops?
Bear in mind the equipment (tanks, arty, vehicles, etc) that would have to be left behind anyway for lack of fuel and horses.
Not only any number of rank-and-file Ländser would be welcome, but equally as good would the fact that the all-important staff personnel and army specialists would be saved.
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"Do you mean the Asiatic hordes driven forward under the lash?
Oh, sorry, those were the Persians described by Herodotus in the 5th Cent BC!"