The total deaths in those 3 combined is less than that of Andersonville — the worst was Elmira, which still had a lower mortality rate than Andersonville. Both sides had fairly terrible logistics and diverted supplies, medical personnel, etc, from prisons to other purposes. There was of course some instances of deliberate brutality on both sides but generally conditions just sucked.
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1. There is some dispute about the number of deaths at both Point Lookout and Camp Douglas. There may be at Elmira too but I haven’t read as much about that one.
2. The difference is one of intent. The entire CSA was suffering from a shortage of food and medicine at that time. The same cannot be said for the POW camps in the North.