It was 168 RAF aircrew who were removed from Fresnes prison in Paris as the allies approached, and they were shipped to Buchenwald, not Americans - then when "rescued" by the Luftwaffe they were sent to Stalag Luft III - as this was supposed to be the day before they were executed forgive my cynicism about the Luftwaffe just turning up by chance that one day early!!
See
Squadron Leader Phil Lamason - Telegraph for more information on the incident
Whilst the media still goes on about Dresden what they seem to have forgotten, or are not aware of, is that the USAAF were supposed to bomb first, but were prevented by bad weather, so we get the vilification for being there first!!