Loren Holllis served in the Civil War for both Wisconsin and New York. He used and alias name and I have several questions:

1.) It appeared he was a POW (he was an Union soldier) how can I find information about where he was imprisoned?
2.) He was also under arrest by the Union troops for several months. How can I find what he was arrested for?

Loren claimed that he served with Custer in the Mexican War. Is there a way for me to find roster records for the Mexican War?

Thnaks,