German Army relative

[Ryan]

Evening all,
I have a close friend who is trying to find some history on their grandfather. They have no idea where to start. I would point them straight to the AWM but their relative served in the German army in WW2.
I have told them to start at the AWM as they may have a link to the German equivalent but where else could they start?
All they have to go on is his name, the family believes he served in the cavalry, he didn't join until 1943 and he was a POW of the British.
That makes me think either NW Europe or Italy is where he served. And there would not have been many cavalry units by then, if indeed the family story is true.