I can only suggest that you might want to subscribe to the paid subscription service called fold3 which give you access to the service records of individual soldiers. Often there is a report in their file that will give the time and place of their capture as well as information concerting their paroles or release from prison.

I had a subscription several months but let it expire. My vision does not allow me to research very much. In my opinion information on this site is well worth the annual cost. They even offer a monthly subscription or a quarterly subscription.

Good luck with your search.