Thank you Michael for filling in lots of holes for me. Thanks to Don I know gggrandfather Lawrence Carpenter prisoner roll calls. The last one showed where several on the page before him and many below his name were sent to Cairo for exchange. I think he probably went with that group for exchange. It was September 6, 1862. I am reading the suggested material as fast as I can. It takes someone with great interest in the Civil War to paint the pictures like you and Don and the rest. My good fortune! Thank You.