S8 Ep1086: Fitzhugh Brundage, author of A Fate Worse Than Hell, explains that following the Battle of Gettysburg, the breakdown of exchanges

Fitzhugh Brundage, author of A Fate Worse Than Hell, explains that following the Battle of Gettysburg, the breakdown of exchanges necessitated large-scale prisoner concentration. Andersonville was established in remote Georgia to alleviate the burden on Richmond's food supply and reduce guard requirements. Prisoners like N. Burch endured grueling train transports without hygiene or food to reach the stockade. Conversely, the Union created Point Lookout in Maryland as a retaliatory concentration camp, forcing thousands of Confederates to live in inadequate tents on a sand spit. (5)RICHMOND