Fort Delaware prison was located on Pea Patch Island in the Delaware River. Approximately 33,565 Confederate prisoners passed through during its existence. The reason was constructed as a fort to protect northern cities. A 12-foot-deep, 30-foot moat surrounded the prison. The granite walls were seven to thirty feet thick. The prison was plagued with the usual diseases and malnutrition of all prisons north and south during the Civil War. At this prison 2,436 Confederate prisoners died. Their bodies were transported by boat to the New Jersey side of the Delaware River and buried in trenches at a place called Finns Point. A towering granite obelisk marks the spot and at its base are plaques with the names of the soldiers in the common grave.