Troops and contrabands? Homosexuality in CW military?

I am a graduate student (M.A.) at Central Washington University, and I want to write my thesis on a Civil War-related topic. I was thinking about looking at court martial records to investigate relations between troops and contrabands. I was also thinking of looking at court martial records to see if there was any evidence of homosexuality among Civil War troops. Can anyone recommend any secondary literature on these topics? Also, does anyone know if court martial records include testimony? I have not been able to do any preliminary research on this question yet, unfortunately. I am planning on starting my research on this topic in depth in January for a research seminar I'm taking. I thought this would be a good place to start looking and to get some general ideas. Thank you!