Jane --

You must have this man's military service file or have read information taken from it. The card giving Wittsburg AR as a place of parole has a heading that reads Prisoners of War, or something similar.

It doesn't mean that he was ever captured or placed in a military prison. McClure voluntarily gave his parole to lay down arms on this date. Afterwards if Federal authorities sought to have him arrested for being a Confederate soldier, the parole would allow him to remain at home unmolested.