SubDiv4

Submarine Division 4

Activated	Deactivated	Boats	Formations	Successes	Notes
01/12/1916 15/11/1921 31/10/1941	02/11/1918 01/04/1940 10/08/1942	HA-1=01/12/1916-02/11/1918 HA-2=01/12/1916-02/11/1918 HA-7=01/12/1916-02/11/1918 HA-8=07/02/1917-02/11/1918 HA-10=10/09/1917-02/11/1918 02/11/1918=Deactivated; RO-54=01/12/1921-01/04/1940 RO-55(1)=01/12/1921-01/04/1940 RO-56(1)=21/01/1922-01/04/1940 01/04/1940=Deactivated; I-24=31/10/1941-01/02/1942 I-25=31/10/1941-10/08/1942 I-26=06/11/1941-10/08/1942 I-23=01/02/1942-10/04/1942+ 10/08/1942=Deactivated;	Torp.Ron.4;3rd Fleet= 01/12/1916-01/12/1917 Torp.Ron.4;2ndFleet= 01/12/1917-02/11/1918 02/11/1918=Deactivated; Yokosuka ND= 15/11/1921-01/12/1921 Sub.Ron.1;1stFleet= 01/12/1921-01/12/1925 Yokosuka Defence Div.;Yokosuka ND= 01/12/1925-01/04/1926 Yokosuka ND= 01/04/1926-01/08/1926 Yokosuka Defence Div.;Yokosuka ND= 01/08/1926-01/12/1927 Yokosuka ND= 01/12/1927-30/11/1929 Yokosuka Defence Div.;Yokosuka ND= 30/11/1929-15/11/1934 Yokosuka ND= 15/11/1934-15/11/1938 4th Reserve; Yokosuka ND= 15/11/1938-01/04/1940 01/04/1940=Deactivated; Sub.Ron.1; 6thFleet;Combined Fleet= 31/10/1941-10/08/1942 10/08/1942=Deactivated;	W'ship sunk:0; W'ship dam: 0; M'ship sunk: 02@005426t; M'ship dam: 02@015810t; Total sunk: 02@005426t; Total dam: 02@015810t; Total: 04@021236t;	CO:01/12/1916-02/11/1918= Cpt.Imaizumi Tetsutaro; [25] CO: CO:15/11/1921-01/12/1922= Cdr.Kono Tsutoko; [32] CO:01/12/1922-01/12/1924= Cdr.Aoki Teinosuke; [31] CO:01/12/1924-01/12/1925= Cdr.Owada Yoshinosuke; [35] CO: CO:01/05/1928-10/12/1928= Cdr.Takasu Sanjiro; [37] CO: CO:01/12/1932-15/11/1933= Cdr.Akiyama Katsuzo; [40] CO:15/11/1933-15/12/1934= Cdr.Harada Kaku; [41] CO: 01/04/1940=Deactivated; CO:31/10/1941-05/04/1942= Cpt.Oda Tamekiyo; [43] CO:05/04/1942-10/08/1942= Cpt.Nagai Mitsuru; [45] 10/08/1942=Deactivated;

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