Interesting question R.D.. From my experience with the subject yes there were. Some were held in naval vessels just outside of New Orleans, Louisiana and a few were also held in confinement with the Provost Marshal's office in New Orleans. If you speaking of northern soldiers held in confinement for desertion as an example they too were held at the Provost Marshal's Office in New Orleans, Louisiana. I believe the Provost Marshal at New Orleans in 63 and 64 was A. Attocha. Some of the Union convicted deserters found guilty upon court martial were sent to Dry Tortugas, Florida in other words Fort Jefferson and were held at the Provost Marshal's Office until their court martial. Somewhere in my records I have the address for the Provost Marshal at New Orleans. For Union deserters as an example just deserting was generally not enough to send a soldier to Fort Jefferson. However if he was found guilty of two counts against him that being deserting his military unit and enlisting in another Union regiment while not being discharged with his original unit which many tried to do he was charged with two counts and many times did spend a few months at Fort Jefferson under hard labor. History has come to term many of these as bounty jumpers. Ironically, many of them would use their real names trying to enlist in other Union regiments. New York regiments at New Orleans seemed to be a favorite place for them to try and enlist again. Federal detectives were roaming the streets of New Orleans looking for deserters. They were paid $30.00 for each deserter being caught and they always were checking such places as bothels. Some detectives were making a lot of money especially in New Orleans. The Union deserters were not really trying to get rich but rather just trying to survive in an occupied Southern city. Lincoln's last proclamation really put an end to the detectives wealth. See Lincoln's last proclamation on the Georgia board with today's date. I can't speak of post April 1862 until mid 1863 in Louisiana but would guess it may have been the same. Hope this helps. Thx Dennis