I am seeking information about the Union prisons in Louisiana that housed Confederate soldiers. My great-grandfather was a Lake Providence Cadet, a lieutenant in the Fourth Louisiana Infantry, surrendered at Port Hudson and imprisoned for several months in New Orleans. I had always understood that he was confined in the U.S. Customs House on Canal Street, then more recently heard that the U.S. Mint was used as the Union prison. (The cells are still there in what is now a building of the Louisiana State Museum.) But I just read "Recollections of a Confederate Officer," written by John Smith Kemball and published in the Louisiana Historical Quarterly in 1946, which describes his father's experience as a member of the 4th Infantry. Kemball's father describes in some detail his imprisonment in and escape from the Customs House. My great-grandfather was transferred to Johnson's Island, Ohio, supposedly after he attempted to escape in New Orleans. If you have information or if you can direct me to other resources, I would appreciate it. Thank you. E. W. Prichard