In late 1861, U.S. officials selected Johnson's Island as the site for a prison camp to hold up to 2,500 captured Confederate officers. The island offered easy access by ship for supplies to construct and maintain a prison and its population. Sandusky Bay offered more protection from the elements than other nearby islands, which were also closer to Canada in case of a prison break. Woods of
hickory and
oak trees could provide
lumber and fuel. The U.S. government leased half the island from private owner Leonard B. Johnson for $500 a year and carefully controlled access to the island for the duration of the war. The prison opened in April 1862. A wooden
stockade surrounded 12 two-story prisoner
housing barracks, a hospital, latrines,
sutler's stand, three wells, a pest house, and two large mess halls (added in August 1864). More than 40 buildings stood outside the prison walls, including
barns, stables, a
limekiln,
forts, barracks for officers, and a powder magazine. They were used by the
128th Ohio Infantry Regiment, which guarded the prison. The island housed officers, some of whom received money from home to purchase goods offered at the sutler's store, run by those who followed the army and sold supplies to the soldiers. The prisoners had a lively community, with amateur theatrical performances, publishing, and crafts projects available. After the unraveling of a Confederate espionage ring that had conspired to seize the
Great Lakes warship USS
Michigan and a mass breakout of prisoners, Forts Johnson and Hill were constructed over the winter of 1864–65. In the war's final months, the forts became operational in March 1865, when the prisoner population peaked at 3,200. Over 15,000 men passed through Johnson's Island until it was closed in September 1865. About 200 prisoners died due to the harsh Ohio winters, food and fuel shortages, and disease. 206 were buried in the Confederate Cemetery located on the island. The cemetery was purchased in 1908 by the United Daughters of the Confederacy of Cincinnati. Johnson's Island had one of the lowest mortality rates of any Civil War prison. Confederates made many escape attempts, including efforts by some to walk across the frozen Lake Erie to freedom in Canada, but only a handful of escapes were successful. ==Post Civil War==