was the first of four main administrative districts of the pre-war Imperial Japanese Navy. Its territory included Tokyo Bay and the Pacific coasts of central and northern Honshū from the Kii Peninsula to Shimokita Peninsula. Its headquarters, along with most of its installations, including the Yokosuka Naval Arsenal, were located in the city of Yokosuka, which constituted the Yokosuka Naval Base.
History The location of Yokosuka at the entrance to strategic Tokyo Bay was recognized of critical importance by the Tokugawa shogunate and early Meiji government. In 1866, the Tokugawa shogunate government established the Yokosuka Seisakusho, a military arsenal and naval base, with the help of foreign engineers, including the French naval architect Léonce Verny. The new facility was intended to produce modern, western-style warships and equipment for the Tokugawa navy. After the Boshin War and the Meiji Restoration, the new Meiji government took over control of the facility in 1871, renaming it the Yokosuka Zosenjo (Yokosuka Shipyards). In August 1876, the Imperial Japanese Navy was organized into eastern and a western strategic zones, with the eastern zone based at Yokosuka, and the western zone based at Nagasaki. However, for ease of communications with naval headquarters in Tokyo, the Tōkai Naval District was relocated to Yokohama in September 1876.
With the reorganization of the Imperial Japanese Navy in April 1886, Japan was divided into five naval districts for recruiting and supply, and the headquarters for the Tokai Naval District was relocated back to Yokosuka, becoming the Yokosuka Naval District, and the Yokosuka Naval Arsenal was placed under its command. As with all naval districts, it was under the direction of the Navy Ministry during peacetime, and came under the command of the fleets stationed within the district in time of war.Evans 1979, p. 29. A Bureau of Torpedo Warfare was established at Yokusuka in June 1885. In a further administrative re-organization of the Japanese Navy in 1889, Yokosuka was designated as the , and its harbor was dredged, a breakwater extended and docking facilities for warships were increased. A Bureau of Mine Warfare was also established. In 1893, schools for naval mechanical engineering, torpedo warfare and naval artillery were established. Schools for naval engineering, and for mine warfare followed in 1907 and a naval medical center in 1908. Naval aviation facilities were established in June 1912, followed by a wireless communications facility in April 1913.
On January 14, 1917, the armoured cruiser Tsukuba exploded and sank in Yokosuka port in an accident. The Naval Construction Department was established in 1921. In June 1930, a Naval Communications School was established, but the Naval Mine School was made independent of the naval district. A Naval Aviation School was established in April 1934.
Pacific war At the time of the attack on Pearl Harbor in 1941, Yokosuka Naval District encompassed the following Order of Battle, 1941 as found on niehorster.orbat.com Yokosuka Naval District HQ Yokosuka Naval Base Yokosuka Naval Base HQ Yokosuka Communications Center Yokosuka Supply Department Accounting Department Construction Department Ports & Docks Unit Yokosuka Naval Arsenal Naval Hospital Naval Prison Naval Fuel Depot Yokosuka Base Garrison Yokosuka 1st Naval BarracksSenshi Sōsho (1975), appendix table "Order of battle of the Combined Fleet on 10 December 1941". Yokosuka 2nd Naval Barracks Yokosuka Special Naval Landing Forces Yokosuka Submarine Base Yokosuka Security Squadron Auxiliary Cruiser Noshiro Maru, Auxiliary gunboat Shoei Maru, Meiji Maru No. 1 Yokosuka Local Defence Squadron Minesweeper Division 25; Auxiliary minesweeper Misago Maru No. 1, Misago Maru No. 3, Kongo Maru No. 2, Naruo Maru, Shintohoku Maru, Togo Maru Minesweeper Division 26; Auxiliary minesweeper Banshu Maru No. 18, Keijin Maru No. 1, Keijin Maru No. 2, Showa Maru No. 10, Submarine tender Komahashi Destroyer , Submarine Chaser No. 22, No. 23 Yokosuka Naval Air Group (Oppama) Tateyama Naval Air Group Kisarazu Naval Air Group 11th Combined Air Group (Training) Kasumigaura Naval Air Group Tsukuba Naval Air Group Yatabe Naval Air Group Hyakurihara Naval Air Group (Ibaraki Pref) Kashima Naval Air Group Suzuka Naval Air Group Tsuchiura Naval Air Group
In May 1945, Michitaro Tozuka became the final commander of the Yokosuka Naval District. Yokosuka was bombed by United States Navy and United States Army Air Forces aircraft in the final stages of the Pacific War, most notably during the attack on Yokosuka on 18 July 1945, but many of its facilities were captured intact by the Allied forces. The Yokosuka area came under occupation by American forces during the occupation of Japan, and most of the facilities of the former Yokosuka Naval District were inherited by the United States 7th Fleet and are now known as United States Fleet Activities Yokosuka. A small portion of the area continues to be used by the modern post-war Japanese Maritime Self-Defense Force and are now known as JMSDF Yokosuka Naval Base, which has preserved a portion of the original red brick gates.
List of commanders
Commander of Tōkai Naval District Name Portrait Rank Term of Office Start End 1 Itō Sukemaro Vice Admiral 5 September 1876 5 March 1880 2 Abo Kiyoyasu Rear Admiral 5 March 1880 4 December 1880 3 Nakamuta Kuranosuke Vice Admiral 4 December 1880 17 June 1881 4 Nire Kagenori Vice Admiral 17 June 1881 12 October 1882 5 Nakamuta Kuranosuke Vice Admiral 12 October 1882 14 December 1884
Director of Yokusuka Naval District Name Portrait Rank Term of Office Start End 1 Nakamuta Kuranosuke Vice Admiral 14 December 1884 26 April 1886
Commanding officers of Yokusuka Naval District Name Portrait Rank Term of Office Start End 1 Nakamuta Kuranosuke Vice Admiral 26 April 1886 8 March 1889 2 Nire Kagenori Vice Admiral 8 March 1889 17 June 1891 3 Akamatsu Noriyoshi Vice Admiral 17 June 1891 12 December 1892 4 Itō Sukeyuki Vice Admiral 12 December 1892 20 May 1893 5 Inoue Yoshika Vice Admiral 20 May 1893 16 February 1895 6 Aiura Norimichi Vice Admiral 16 February 1895 9 April 1897 7 Tsuboi Kōzō Vice Admiral 9 April 1897 30 January 1898 8 Samejima Kazunori Vice Admiral 1 February 1898 19 January 1899 9 Aiura Norimichi Vice Admiral 19 January 1899 20 May 1900 10 Inoue Yoshika Vice Admiral Admiral (after 12 December 1901 20 May 1900 20 December 1905 11 Kamimura Hikonojō Vice Admiral 20 December 1905 1 December 1909 12 Uryū Sotokichi Vice Admiral Admiral (after 16 October 1912) 1 December 1909 1 December 1912 13 Hikohachi Yamada Vice Admiral 1 December 1912 29 May 1914 14 Ijichi Suetaka Vice Admiral 29 May 1914 23 September 1915 15 Fujii Kōichi Vice Admiral 23 September 1915 1 December 1916 16 Prince Higashifushimi Yorihito Vice Admiral 1 December 1916 1 December 1917 17 Nawa Matahachirō Vice Admiral Admiral (after 2 July 1918) 1 December 1917 24 August 1920 18 Yamaya Tanin Admiral 24 August 1920 27 July 1922 19 Takarabe Takeshi Admiral 27 July 1922 15 May 1923 20 Nomaguchi Kaneo Admiral 15 May 1923 5 February 1924 21 Horinouchi Saburō Vice Admiral 5 February 1924 1 December 1924 22 Kanji Kato Vice Admiral 1 December 1924 10 December 1926 23 Okada Keisuke Admiral 10 December 1926 20 April 1927 24 Abo Kiyokazu Admiral 20 April 1927 16 May 1928 25 Yoshikawa Yasuhira Vice Admiral 16 May 1928 10 December 1928 26 Yamamoto Eisuke Vice Admiral 10 December 1928 11 November 1929 27 Ōsumi Mineo Vice Admiral Admiral (after 1 April 1931) 11 November 1929 1 December 1931 28 Nomura Kichisaburō Vice Admiral 1 December 1931 2 February 1932 29 Yamamoto Eisuke Admiral 2 February 1932 10 October 1932 30 Nomura Kichisaburō Vice Admiral Admiral (after 1 March 1933) 10 October 1932 15 November 1933 31 Nagano Osami Vice Admiral Admiral (after 30 March 1934) 15 November 1933 15 November 1934 32 Suetsugu Nobumasa Admiral 15 November 1934 2 December 1935 33 Yonai Mitsumasa Vice Admiral 2 December 1935 1 December 1936 34 Hyakutake Gengo Vice Admiral Admiral (after 1 April 1937) 1 December 1936 25 April 1938 35 Hasegawa Kiyoshi Vice Admiral Admiral (after 1 April 1939) 25 April 1938 1 May 1940 36 Oikawa Koshirō Admiral 1 May 1940 5 September 1940 37 Shiozawa Kōichi Admiral 5 September 1940 10 September 1941 38 Shimada Shigetarō Admiral 10 September 1941 18 October 1941 39 Hirata Noboru Vice Admiral 18 October 1941 10 November 1942 40 Koga Mineichi Admiral 10 November 1942 21 April 1943 Acting Commander Mikawa Gunichi Vice Admiral 21 April 1943 21 May 1943 41 Toyoda Soemu Admiral 21 May 1943 3 May 1944 42 Yoshida Zengo Admiral 3 May 1944 2 August 1944 43 Nomura Naokuni Admiral 2 August 1944 15 September 1944 44 Tsukahara Nishizō Vice Admiral 15 September 1944 1 May 1945 45 Tozuka Michitarō Vice Admiral 1 May 1945 20 November 1945 Acting Commander Komura Keizō Rear Admiral 20 November 1945 30 November 1945
See also United States Fleet Activities Yokosuka Japan Maritime Self-Defense Force#District Forces
References Notes
Bibliography
Senshi Sōsho Vol. 80, Combined Fleet #2, "Until June 1942", Asagumo Simbun (Tokyo, Japan), 1975.