Organization of Kita and Minami Fortresses
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This military organization was under the Twenty-seventh Army (Chishima Area Base Unit or Kuril Area Army), led by Shozo Terakura. The Twenty-seventh Army was under the leadership of the Fifth Area Army, under the command of Kiichiro Higuchi whose headquarters was in Sapporo, Hokkaidō. The Twenty-seventh Army was composed of the 42nd and 91st Divisions.
- 1 Kurile fortresses
- 2 Kita Chishima Fortress
- 2.1 Shumushu Island
- 2.2 Paramushiro Island
- 2.3 Japanese Navy units on Shumushu and Paramushiro
- 2.4 Shimushiro Island
- 2.5 Matsuwa Island
- 2.6 Uruppu Island
- 2.7 Other North Kuriles units
- 3 Minami Chishima Fortress
These defensive structures in the Kurile Islands were somewhat similar to the Karafuto fortifications. The key Japanese position was on Shumushu Island, whose defense consisted of permanent emplacements protected by field and AA artillery. A garrison of over 8,000 men reinforced by 60 tanks defended the islands of Shumushu and Paramushiro. All the coastal sections convenient for landings were covered with permanent emplacements and bunkers, interconnected with underground passages and trenches. All the warehouses, power stations and hospitals were underground, up to 50 m deep.
There are also some similar military buildings in other islands in the Northern Kuriles (Shimushiro, Onnekotan, Uruppu, Matsuwa) and Southern Kuriles (Etorofu, Kunashiri, Shikotan and Habomai archipelago).
Kita Chishima Fortress
Shumushu fortification system
There were nine fortified installations and 20 coastal defence positions commanded from Kataoka Fortress.
Japanese Army units
- 73rd Infantry Brigade (Maj. Gen. Iwao Zugino)
- 282nd Battalion
- 283rd Battalion
- 284th Battalion
- 285th Battalion
- 286th Battalion
- 287th Battalion
- 11th Tank Regiment
- 12th or 2nd Tank Company
- 91st Division
- 1st Artillery Unit
- 2nd Artillery Unit
- I/54th Air Regiment (4 Nakajima Ki-43 Hayabusa "Oscar", some Nakajima Ki-44 Shoki "Tojo" and possibly Nakajima Ki-84 Hayate "Frank"), based in Miyoshino Airfield, Shumushu.
- Shumushu Alert Radar: located at Minami Cape and cannery on the Naka River
Paramushiro fortification system
There are less than two or possibly more fortifications and 6 or more coastal defensive positions commanded from Kashibawara Fortress.
Japanese Army units
- 91st Division HQ (Lt. Gen. Fuzai Tsutsumi)
- 74th Infantry Brigade (Major Zeiji Zato)
- 4th Tank Company (detachment of 11th Tank Regiment)
- II/54th Sentai (Ki-43 Oscars and Ki-44 Tojos)
- Kitanodai Airfield: airfield located on the north-east tip of the island with a single 4,000' x 180° runway. The base had 40 revetments and over 50 hardstands.
- Kashiwabara Airfield: located at the north-eastern tip of the island, closest to Shumshu Island. Japanese Army Staging area in the north.heavily defended by 20 anti-aircraft positions
- Kakumabetsu Airfield: airfield located in the south-west side of the isand with a 3,800' x 150' runway.Ki-44 Tojo operated from this strip.
- Suribachi Airbase: annex airfield located at the center of the south coast of the island, with two runways.
- 51st Guard Unit (942 men)
- 52nd Guard Unit (333 men)
- Shumushu Signal Unit (42 men)
- 32nd AA Defense Unit (18 men)
- Kita Chishima Naval HQ
- North East Fleet (Kashibawara and Kataoka Bases)
- North East Unit (189 men/4 Nakajima B5N2 "Kate" and probably Aichi D3A2 "Val" or Yokosuka D4Y2 "Judy" dive bombers)
- 12th Air Fleet Unit (equipped with Kawanishi H6K2 "Mavis" and Mitsubishi G4M2 "Betty")
- Shimushu Detachment, Naval Air Group 203 (with Mitsubishi A6M5 "Zeke" and Nakajima J1N1-S "Irving" night fighter)
- Hokuto Kokutai (553rd Kokutai) - B5N Kate & B6N Jill
- 203rd Kokutai (A6M, J1N1)
- Musashi Naval Base (Musashi Airfield): Located on the south-western tip of Paramushiro island was this naval base and airfield located at Karabu Zaki. The runways were 4,300' x 260' and 4,200' x 375'. Anti-aircraft guns were added at the nearby cape with 8 guns, 20 pillboxes and many gun pits.
- Miyoshino Airfield Japanese Army-Navy airfield, located near the center of the Shumushu island.This airfield based several units including a B5N2 Kate, G3M Nell and Ki-43 Oscar based there.
- Kataoka Naval Base (Imaizaki Airfield):This base had two runways 5,000' x 250' and 4,000' x 250'. The base had a large 130' x 165' hangar with 13 covered revetments and 34 uncovered revetments, three 60' oil storage tanks, and other barracks and supply buildings.The base also had a seaplane facility on the harbor, allowing H6K2 Mavis flying boats to operate at the base as headquarters of the 5th Fleet.
There was also a Japanese air early warning radar of unspecified type on the southern cape of Paramushiro, Kurabu Zaki, but its view of Shumushu was likely blocked by the 5958-foot volcano (apparently named Suribachi, like the one on Iwo Jima) in the center of Paramushiro.
Shimushiro fortification system
Japanese Army units
- 41st Independent Mixed Regimen (Colonel Ueda)
- 6th Independent Tank Company
- Matsuwa Army Field Battalion
- Matsuwa Air Intelligence Unit
- 102nd hikotai, 553rd Kokutai (air naval unit equipped D3A2 type 99 model 22)
6000 troops were based on Uruppu, including:
- 129th Independent Mixed Brigade (Maj. Niho)
- 53rd Anchorange Unit
- 6th Disembarcation Unit (800 men)
- 80th Airfield Battalion
- Uruppu Air Intelligence Unit (800 men)
- 5th Independent Tank Company
- 23rd Independent AA Gun Company
Other North Kuriles units
Minami Chishima Fortress
Etorofu fortification system
Defensive organization commanded from Rubetsu Fortress, was divided into:
- Shibetoro County
- Shibetoro Fortress
- Shana County
- Rubetsu or Etorofu County
Japanese Army units
- 89th Division (Lt. Gen. Ogawa)
- 3rd Mixed Brigade
- 15th Independent Mortar Battalion
- 6th Independent Machine Gun Battalion
- 67th Independent Field Machine Cannon Company
- 23rd Independent Field AA Gun Company
- 13th Independent Antitank Gun Company
- 6th Shipping Engineer Regiment
- Etorofu Air Intelligence Unit
- Hokushintai Sentai (Army Anti Submarine Warfare Squadron) (equipped with Ki-45-Tei is KMX-MAD (Magnetic Anomaly Detector))based in Tenneru Army Airfield, Etorofu Island.
- 4th Mixed Brigade
- 23rd Independent Machine Gun Battalion
- 1st Mortar Company/15th Independent Mortar Battalion
- 1st Battalion/4th Mixed Brigade
- 23rd Special Guards Company