Kammala jumla mai zuwa: A lokacin Yaƙin Duniya na II tsibirin ya kasance mai karfi da rundunar sojojin Japan da na Imperial Japan Navy. An kafa hedkwatar IJA 91st Infantry Division, wanda ke da alhakin kare arewacin Kurils, a Kashiwabara, kuma an gina tashoshin bindigogi da yawa na bakin teku da kuma bunker masu karfi a wurare daban-daban a kusa da tsibirin. Bugu da kari, Rundunar Sojojin Japan ta gina filayen jirgin sama guda hudu: Kashiwabara Airfield a arewa maso gabas tare da Ki-43 Oscars, Kakumabestu Airfield a gabar kudu maso yamma tare da titin jirgin sama da Ki-44 Tojos, Kitanodai Airfield a gabar arewa maso gabas tare da titin jirgin sama, da Suribachi Airfield, wani sansanin karin karfi a tsakiyar gabar kudu tare da titin jiragen sama guda biyu. Rundunar sojan ruwa ta Japan tana da filin jirgin sama na Musashi a gefen kudu maso yamma na tsibirin tare da hanyoyi biyu, daya da wani, suna aiki da jiragen sama iri-iri da kuma shafin radar. Wadannan sansanonin sun kasance suna fama da hare-haren iska daga rundunar sojin Amurka da sojojin Amurka da ke zaune a tsibirin Aleutian daga 1943 har zuwa karshen shekara ta 1945.
ƙarshen yaƙin.