Yes, I am aware of the prisoner exchanges in the Alexander papers. The problem is that at the time of those prisoner exchanges Helena was under Union control. So there would not have been a POW camp at Helena for a Union soldiers Prisoner of War.

I am of the opinion that if the facts are provable in this case of a Union Soldier being held in a southern POW camp in Helena awaiting to be exchanged in 1862, It would have had to have been a POW captured at Pea Ridge or some earlier engagement, and exchanged before General Curtis occupied Helena on July 12th. I would think that the exchange probably happened prior to Van Dorn abandoning the State in Mid April of 1862.