To deter Union shelling of the city of Charleston in 1863, South Carolina brought Union prisoners into the city as targets. In response, Union leaders sent 600 Confederate prisoners to Morris Island within site of the city where Union artillery was located. After a prisoner exchange, 600 more Union prisoners to deter shelling in 1864. Again in response, the Union brought 600 Confederate prisoners. The cruel treatment of these men was retribution for the treatment of Union prisoners at Andersonville.