<P> The overall mortality rates in prisons on both sides were similar, and quite high . Many Southern prisons were located in regions with high disease rates, and were routinely short of medicine, doctors, food and ice . Northerners often believed their men were being deliberately weakened and killed in Confederate prisons, and demanded that conditions in Northern prisons be equally harsh, even though shortages were not a problem in the North . </P> <P> About 56,000 soldiers died in prisons during the war, accounting for almost 10% of all Civil War fatalities . During a period of 14 months in Camp Sumter, located near Andersonville, Georgia, 13,000 (28%) of the 45,000 Union soldiers confined there died . At Camp Douglas in Chicago, Illinois, 10% of its Confederate prisoners died during one cold winter month; and Elmira Prison in New York state, with a death rate of 25%, very nearly equaled that of Andersonville . </P> <Table> <Tr> <Th> Combatant </Th> <Th> Name </Th> <Th> Location </Th> <Th> Notes </Th> <Th> Image </Th> </Tr> <Tr> <Td> Union </Td> <Td> Camp Chase </Td> <Td> Columbus, Ohio </Td> <Td> Established in May 1861 and closed in 1865 . The camp's original capacity was for 4,000 men, but at times more than 7,000 prisoners were accommodated . The capacity was increased to 7,000, but towards the end of the war up to 10,000 men were crammed into the facility . </Td> <Td> The memorial to the Confederate dead at Camp Chase, published in 1909 </Td> </Tr> <Tr> <Td> Union </Td> <Td> Camp Douglas </Td> <Td> Chicago, Illinois </Td> <Td> </Td> <Td> Camp Douglas in Chicago the largest prisoner of war camp for detaining military personnel of the Confederate States of America </Td> </Tr> <Tr> <Td> Union </Td> <Td> Fort Slocum </Td> <Td> Davids' Island, New York City </Td> <Td> Davids' Island was used from July 1863 to October 1863 as a temporary hospital for Confederate soldiers injured during the Battle of Gettysburg . </Td> <Td> </Td> </Tr> <Tr> <Td> Union </Td> <Td> Elmira Prison </Td> <Td> Elmira, New York </Td> <Td> Originally established as Camp Rathbun, a training base, the site was converted to a prisoner of war camp in 1864 with a capacity for approximately 12,000 prisoners . Before its closure in 1865, 2,963 prisoners died there from various causes . </Td> <Td> </Td> </Tr> <Tr> <Td> Union </Td> <Td> Fort Delaware </Td> <Td> Delaware City, Delaware </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Union </Td> <Td> Fort Warren </Td> <Td> Boston, Massachusetts </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Union </Td> <Td> Gratiot Street Prison </Td> <Td> St. Louis, Missouri </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Union </Td> <Td> Johnson's Island </Td> <Td> Lake Erie, Sandusky, Ohio </Td> <Td> </Td> <Td> Johnson's Island Prison barracks enclosed by a stockade </Td> </Tr> <Tr> <Td> Union </Td> <Td> Ohio Penitentiary </Td> <Td> Columbus, Ohio </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Union </Td> <Td> Old Capitol Prison </Td> <Td> Washington, DC </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Union </Td> <Td> Point Lookout </Td> <Td> Saint Mary's County, Maryland </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Union </Td> <Td> Rock Island Prison </Td> <Td> Rock Island, Illinois </Td> <Td> A U.S. Government owned island in the Mississippi River </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Andersonville </Td> <Td> Andersonville, Georgia </Td> <Td> The site is the National POW Museum <P> 13,000 of the 45,000 Union soldiers imprisoned here died, making Andersonville the worst prison in the Civil War . </P> </Td> <Td> Bird's eye view of the Andersonville POW camp . </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Camp Lawton </Td> <Td> Millen, Georgia </Td> <Td> To relieve some of the conditions at Andersonville, a larger prison was constructed in the summer of 1864 near the Lawton Depot in the town of Millen, Georgia . Around 10,000 prisoners were moved to Camp Lawton between October to late November 1864 . It is currently a state park, Magnolia Springs . </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Belle Isle </Td> <Td> Richmond, Virginia </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Blackshear Prison </Td> <Td> Blackshear, Georgia </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Cahaba Prison (Castle Morgan) </Td> <Td> Selma, Alabama </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Camp Ford </Td> <Td> Near Tyler, Texas </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Castle Pinckney </Td> <Td> Charleston, South Carolina </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Castle Sorghum </Td> <Td> Columbia, South Carolina </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Castle Thunder </Td> <Td> Richmond, Virginia </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Danville Prison </Td> <Td> Danville, Virginia </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Florence Stockade </Td> <Td> Florence, South Carolina </Td> <Td> </Td> <Td> Florence Stockade Confederate Prison Camp </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Fort Pulaski </Td> <Td> Savannah, Georgia </Td> <Td> </Td> <Td> Fort Pulaski used as Confederate prison camp from 1861 - 1862 </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Libby Prison </Td> <Td> Richmond, Virginia </Td> <Td> </Td> <Td> Libby Prison in 1865, a Confederate prisoner of war camp for Union officers, National Archives and Record Administration </Td> </Tr> <Tr> <Td> Confederate </Td> <Td> Salisbury Prison </Td> <Td> Salisbury, North Carolina </Td> <Td> </Td> <Td> Bird's Eye View of the Confederate Prison Pen, Salisbury, North Carolina, 1861, lithograph </Td> </Tr> </Table> <Tr> <Th> Combatant </Th> <Th> Name </Th> <Th> Location </Th> <Th> Notes </Th> <Th> Image </Th> </Tr>

What were the two main pow camps during the civil war
find me the text answering this question