During the war, the Army Quarantine and the Equestrian Quarantine stations were located on Ninoshima Island. Soldiers and horses returning from overseas were held here and disinfected to prevent them from bringing infectious diseases into Japan. A dock for army ships, an explosives armory, and other military facilities were built on the island. These facilities were little used toward the end of the war, but after the atomic bombing, because Ninoshima was 9 km from the hypocenter and only slightly damaged by the bomb, many victims were taken there for treatment. Some 10,000 victims were transported to the island between August 6 and 25. Many thousands died.