American POW Camp - Attichy in France 1945

Hello everyone

I would like to ask You about American POW Camp in France during Second World War. This is short story.

My friend’s grandfather as a 17 years old boy was recruited to Wehrmacht Army, although he was Pole. (this a long story to describe, maybe next time). In 2^nd of April 1945 he and other Wehrmacht soldiers was captured in Halle (Germany) by  10^th Tank Battalion (commanded by lt.col. Hamberg). This unit was a part of 5^th US Armored Division.  Next he was transported to Rheinberg-Namur- Attichy (France). In Attichy he spent some time, perhaps to 28^th of April 1945, when polish force took over him to polish army in Italy.

I would like to ask You

1. 1.)    Where (I mean archives) can I find some information about Attichy camp and German prisoners?  I would like to know which American units guarded camp etc.

1. 2.)    Did American officers make in POW’s camp some prisoners list?