Samuel McCamish was shipped with the sick and wounded on 24 July 1863. He was a patient in Hospital #2. I have a copy of the actual parole list taken from the hospital beds. The list was recorded by state served from alphabetically, hospital units last, also by state served from and by unit. have you seen this film? NARA microfilm.
From your deduction, he must have been severely wounded. Is there any record of the men processed at Mobile Harbor 4 Aug 1863?