4th Fleet (Imperial Japanese Navy)

The 4th Fleet was a fleet of the Imperial Japanese Navy. The Fourth Fleet designation was used during three separate periods. The initial designation was for a group of ships that were assigned to work together during the Russo-Japanese conflict and the period of its immediate aftermath. The second time the designation was used was during the Sino-Japanese conflict, and the third time was as a South Pacific area of command during the middle of the Pacific War.

Contents

• 
  1 History
  
  
  
  • 
    1.1 Russo-Japanese War
    
  
  
  • 
    1.2 The Fourth Fleet incident
    
  
  
  • 
    1.3 Second Sino-Japanese War
    
  
  
  • 
    1.4 Pacific War
    
  
  
  
  


• 
  2 Structure
  
  
  
  • 
    2.1 Russo-Japanese War
    
  
  
  • 
    2.2 Second Sino-Japanese War
    
  
  
  • 
    2.3 Order of Battle at time of Pearl Harbor
    
  
  
  
  


• 
  3 Commanders of the 4th Fleet
  


• 
  4 References
  


• 
  5 External links
  

History

Russo-Japanese War

First established on June 14, 1905, the 4th Fleet was created after the Battle of Tsushima in the Russo-Japanese War specifically to support and cover the landings of Japanese forces in Sakhalin. Afterwards, it was sent to the United States with the Japanese delegation negotiating the Treaty of Portsmouth ending the war, and was disbanded on December 20, 1905.

The Fourth Fleet incident

While participating in war game maneuvers in 1935 the Fourth Fleet became caught in extremely foul weather. The weather continued to deteriorate and by 26 September had reached typhoon status. Two of the newer, large Special Type destroyers, the Hatsuyuki and the Yugiri, had their bows torn away by the heavy seas. A number of recently built heavy cruisers also suffered significant structural damage. The Myoko, the Mogami and the submarine tender Taigei developed serious cracks in their hulls, and the light aircraft-carriers Hōshō and Ryujo suffered damage to their flight decks and superstructure, with the Ryujo also having her hangar section flooded. The minelayer Itsukushima suffered damage that required several months for extensive repairs, necessitating a near complete rebuild. Nearly all the fleet's destroyers suffered damage to their superstructures, and fifty-four crewmen were lost, swept overboard or killed outright.^[1]

The Japanese Admiralty held a hearing on the damage suffered by Fourth Fleet in the storm, resulting in recommendations for changes on Japanese warship design and construction. A number of new designs that used heavier guns and taller superstructures were found to be top heavy, and efforts were made to stabilize these ships by reducing weight above the waterline. In addition, cracks in the hulls of the new cruisers indicated the recently adopted practice of electric welding hull seams was suspect, and the practice was canceled on all new Japanese warship construction.^[2] The event was kept a secret from the public.

Second Sino-Japanese War

On October 20, 1937, the 4th Fleet was resurrected as part of the emergency reinforcement program for the China Area Fleet after the North China Incident of 1937. The new 4th fleet was based out of Tsingtao and assigned to patrol the Bohai Sea and the East China Sea regions. However, unlike the IJN 5th Fleet, the 4th Fleet was never in actual combat. On November 15, 1939, the 4th Fleet was absorbed into the 3rd China Expeditionary Fleet under the overall aegis of the China Area Fleet. Although most of its ships were released for service with the Combined Fleet in the Pacific War a year later, most of the staff for the 4th Fleet remained in China, and were assigned to the Tsingtao Base Force for the duration of the war.

Pacific War

On the same date that the 4th Fleet was absorbed into the China Area Fleet, a new 4th Fleet was created to provide administrative control over Japanese naval forces in the Japanese-held island territories of the South Pacific (Caroline Islands, Marshall Islands, Mariana Islands, Palau). This third IJN 4th Fleet came under the aegis of the Combined Fleet on November 15, 1940.^[3] The operational name of this fleet was the South Seas Force. With the start of hostilities against the United States, the 4th Fleet was based out of Truk,^[4] with a secondary base at Kwajalein. After initial Japanese successes, additional bases were established in the southern Philippines, Guam, Wake Island, Gilbert Islands, eastern New Guinea, Bismarck Archipelago and the Solomon Islands.

After the Battle of the Coral Sea, the area covered by the 4th Fleet was reduced to an “inner core” of Japanese possessions, while the new IJN 8th Fleet was assigned to confront the advancing American forces in the Solomon Islands and New Guinea. However, in November 1943, the Americans attacked the Gilbert Islands and captured the major naval base of Tarawa, which brought the 4th Fleet and its various garrison forces back into the front lines of combat.

The Americans continued to advance through the Marshall Islands in early 1944, neutralizing the Japanese bastion at Truk Atoll in the Carolines, headquarters of the IJN 4th Fleet, by means of powerful naval air strikes in February, and forcing the removal of Japan's major naval units to Palau, which also proved vulnerable to air attack.

In March 1944, the IJN 4th Fleet came under operational control of the Central Pacific Area Fleet based in Saipan. It effectively ceased to exist with the fall of Saipan to American forces.^[5]

Structure

Russo-Japanese War

• Cruiser Division 7 (Chinen, Iki, Okinoshima, Mishima)


• Cruiser Division 8 (Itsukushima, Hashidate, Matsushima)


• Cruiser Division 9 (Chokai, Maya, Akagi, Uji, Destroyer Divisions 1, 10, 11, 15 and 20)


• Auxiliaries: Manshu, Tanan-maru.

Second Sino-Japanese War

• Flagship: Ashigara
  


• Cruiser Division 9: Myōkō, Nagara
  


• Cruiser Division 14: Tenryū, Tatsuta
  


• No.4 Torpedo Squadron: Kiso,
  
  
  
  • Destroyer Division 6
  
  
  • Destroyer Division 10
  
  
  • Destroyer Division 11
  
  
  
  


• No.5 Torpedo Squadron: Natori
  
  
  
  • Destroyer Division 5
  
  
  • Destroyer Division 22
  
  
  
  

Order of Battle at time of Pearl Harbor

• Flagship: Kashima
  


• 
  Cruiser Division 18 (Wake Invasion Task Force, based at Kwajalein)
  
  
  
  • Tenryū
  
  
  • Tatsuta
  
  
  • 
    Armed merchant cruisers Kongō Maru and Kinryu Maru
    
  
  
  • Destroyer Squadron 6 (partial)
    
    
    
    • Yubari
    
    
    • Destroyer Division 29 (Hayate, Oite)
    
    
    • Destroyer Division 30 Kisaragi, Mochizuki, Mutsuki, Yayoi
      
    
    
    
    
  
  
  • Maizuru 2nd SNLF
  
  
  
  


• Minesweeper Division 19 (Gilbert Island Invasion Task Force)
  
  
  
  • Tenyo Maru
  
  
  • 
    Tokiwa (converted to minelayer)
  
  
  • Okinoshima
  
  
  • Tsugaru
  
  
  • Destroyer Squadron 6 (partial)
    
    • Destroyer Division 29 (Asanagi, Yūnagi)
    
    
  
  
  
  


• Submarine Squadron 7 (based at Kwajalein)
  
  • Submarine tender Jingei
    
    
    
    • Submarine Division 26
    
    
    • Submarine Division 27
    
    
    • Submarine Division 28
    
    
    
    
  
  


• No.3 Base Force (Palau)


• No.4 Base Force (Truk)


• No.5 Base Force (Saipan)


• No.6 Base Force (Kwajalein)


• No.24 Air Flotilla
  
  
  
  • Seaplane tender Kiyokawa Maru
    
  
  
  • Seaplane tender Kamoi
    
  
  
  • Aircraft Transport Goshū Maru
    
  
  
  • Yokohama Air Group
  
  
  • Chitose Air Group
  
  
  
  

Commanders of the 4th Fleet

Commander in chief ^[6]

Rank	Name	Date
Admiral	Baron Dewa Shigeto	14 Jun 1905 – 20 Dec 1905
	Disbanded	20 Dec 1905 – 20 Oct 1937
Admiral	Soemu Toyoda	20 Oct 1937 – 15 Nov 1938
Vice-Admiral	Masaharu Hibino	15 Nov 1938 – 15 Nov 1939
Vice-Admiral	Eikichi Katagiri	15 Nov 1939 – 15 Nov 1940
Admiral	Shiro Takasu	15 Nov 1940 – 11 Aug 1941
Admiral	Shigeyoshi Inoue	11 Aug 1941 – 26 Oct 1942
Vice-Admiral	Baron Tomoshige Samejima	26 Oct 1942 – 1 Apr 1943
Vice-Admiral	Masami Kobayashi	1 Apr 1943 – 19 Feb 1944
Vice-Admiral	Chuichi Hara	19 Feb 1944 – 2 Sep 1945

Chief of Staff

Rank	Name	Date
Admiral	Tanin Yamaya	14 Jun 1905 – 20 Dec 1905
	Disbanded	20 Dec 1905 – 20 Oct 1937
Vice-Admiral	Masami Kobayashi	20 Oct 1937 – 1 Sep 1938
Vice-Admiral	Arata Oka	1 Sep 1938 – 15 Nov 1939
Vice-Admiral	Fukuji Kishi	15 Nov 1939 – 10 Oct 1941
Vice-Admiral	Shikazo Yano	10 Oct 1941 – 1 Nov 1942
Rear-Admiral	Shunsaku Nabeshima	1 Nov 1942 – 6 Jan 1944
Rear-Admiral	Michio Sumikawa	6 Jan 1944 – 30 Mar 1944
Vice-Admiral	Kaoru Arima	30 Mar 1944 – 12 Aug 1944
Rear-Admiral	Michio Sumikawa	12 Aug 1944 – 2 Sep 1945

References

1. 
   ^ Evans, David; Peattie, Mark (1997). Kaigun: Strategy, Tactics and Technology in the Imperial Japanese Navy 1887-1941. Naval Institute Press. p. 243. ISBN 0-87021-192-7..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
   


2. 
   ^ Hideo Kobayashi. "Failure Knowledge Database: The Fourth Fleet Incident" (PDF). Tokyo Institute of Technology.
   


3. 
   ^ Weinberg, Gerhard (1994). A World at Arms: A Global History of World War II. Cambridge University Press. p. 167. ISBN 0-521-44317-2.
   


4. 
   ^ Jeffery, Bill (2003). War in Paradise: World War II Sites in Truk Lagoon. Historical Preservation Office. ISBN 982-9067-01-7.
   


5. 
   ^ D'Albas 1965, p. ?.
   


6. 
   ^ Wendel, Axis History Database retrieved 25 August 2007.
   

Bibliography

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• 
  D'Albas, Andrieu (1965). Death of a Navy: Japanese Naval Action in World War II. Devin-Adair Pub. ISBN 0-8159-5302-X.
  


• 
  Dull, Paul S. (1978). A Battle History of the Imperial Japanese Navy, 1941-1945. Annapolis, MD: US Naval Institute Press. ISBN 0-87021-097-1.
  


• 
  Lacroix, Eric; Linton Wells (1997). Japanese Cruisers of the Pacific War. Annapolis, MD: US Naval Institute Press. ISBN 0-87021-311-3.
  

External links

• 
  Nishida, Hiroshi. "Imperial Japanese Navy". Archived from the original on 2013-01-30. Retrieved 2007-02-25.
  


• 
  Wendel, Marcus. "Axis History Database". Retrieved 2007-08-25.
  

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