Hi drdl,
Ok. This may be of interest.
In some testaments by pow's who were at BAB 21, they mention that they set out on 21st January 1945, but due to the deep snow, they could not reach the camp at Reigersfeld (this camp being BAB 20 at Reigersfeld, which was approx 5 miles distant in a westerly direction) and had to return to BAB 21. They then set out again on 22nd January.
If you have not seen it, there is an interesting report on the 'Pegasus Archive' in relation to BAB 21 being hit in a bombing raid on Saturday 2nd December 1944, in which a number of pow's were killed and others injured.