Ketsu-Go would go into effect when enemy troops attempted to seize either offshore islands such as Cheju-do, or the main islands of Shikoku, Honshu, or Kyushu. It called for the all-out employment of every available weapon left in the arsenal. The Japanese had hoarded planes, boats, bullets and guns for one great battle. Five thousand two hundred and twenty-five aircraft were to be used as suicide planes. Many of them were hidden under trees or under camouflage nets. Their gas tanks held only enough fuel for one trip to an invasion beach.