The Magnetic Battery, Fort War or The Forts, as it is commonly referred, is a former Royal Australian Navy artillery battery in the hinterland of Horseshoe. Florence and Arthur Bays on Magnetic Island. Built in 1942/1943, the battery operated from July 1943 until the end of World War II. The remains of the facility are now maintained by Queensland Parks and Wildlife Service as part of the Magnetic Island National Park and are open to visitors year round.