ZATSUYOSEN!
(CHOKO MARU, prewar)
IJN CHOKO MARU:
Tabular Record of Movement
© 2011 Gilbert Casse, Bob Hackett and Peter Cundall
6 February 1939:
Tama. Laid down by Tama Zosensho K.K. as a 3,515-ton cargo
ship for Taiyo Kogyo K.K., Kobe.
1 June 1939:
Launched and named CHOKO MARU [1].
30 November 1939:
Completed and registered at Kobe.
E 1939:
Chartered to Mitsui Bussan K.K.
19 July 1941:
Requisitioned by the IJN as a transport (Ippan
Choyosen). [2]
9 September 1941:
Attached to the Yokosuka Naval District.
20 September 1941:
Registered in the IJN as an auxiliary transport under
internal order No. 1093 and attached to the Kure Naval District as an auxiliary
transport, (Otsu) category. Starts her conversion to her military role at Kure
Naval Arsenal. [3]
14 October 1941:
Conversion is completed.
22 October 1941:
Departs Kure. Calls at Osaka and Tokyo.
5 November 1941:
Arrives at Yokosuka.
6 November 1941:
Departs Yokosuka for Pagan Island, northern Marianas.
12 November 1941:
Arrives at Pagan.
15 November 1941:
Departs Pagan for Saipan, Marianas.
16 November 1941:
Arrives at Saipan.
22 November 1941:
Departs Saipan for Otaru, Hokkaido.
4 December 1941:
Arrives at Otaru. Departs later that same day and
arrives at Yokohama at an unknown date.
E December 1941:
Departs
Yokohama for Muroran, Hokkaido.
19 December 1941:
Arrives at Muroran.
22 December 1941:
Departs Muroran for Palau, Carolines.
2 January 1942:
Arrives at Palau.
8 January 1942:
Departs Palau for Yokosuka.
19 January 1942:
Arrives at Yokosuka. Departs later that same day.
E January-February 1942:
Calls at Hakodate, Hokkaido then at Muroran,
Tokyo and Chichi-Jima, Ogasawara Gunto (Bonins).
20 February 1942:
Resupplies with assorted goods auxiliary gunboats
MAGANE and YOSHIDA MARUs.
E February-March 1942:
Calls at Chichi-Jima, Haha-Jima, and Iwo Jima,
Ogasawara Gunto (Bonins).
18 March 1942:
Arrives at Marcus Island (Minami Torishima).
20 March 1942:
Departs Marcus for Tinian, Marianas.
23 March 1942:
Arrives at Tinian.
30 March 1942:
Departs Tinian for Chichi-Jima.
3 April 1942:
Arrives at Chichi-Jima. Comes alongside and resupplies
auxiliary gunboats MAGANE and YOSHIDA MARUs with assorted fresh goods.
4 April 1942:
Departs Chichi-Jima.
E April-May 1942:
Calls at Osaka, Moji, Chinnampo in Korea (Chosen),
Takao and Kirun in Formosa (now Kaohsiung and Keelung, Taiwan), Yokkaichi, Mie
Prefecture, and again Moji and Chinnampo.
29 May 1942:
Arrives at Kure. Probably undergoes some maintenance and
repairs.
12 June 1942:
Departs Kure.
E June 1942:
Calls at Moji, Nagoya and Tamano.
24 June 1942:
Arrives at Tamano. Docks at Mitsui Engineering and
Shipbuilding K.K. Shipyard for maintenance and repairs.
11 July 1942:
Repairs are completed. Exits shipyard and departs
Tamano.
E July-August-September 1942:
Calls at Yokohama, Otaru, then at
Raichishi, Karafuto (now Aynuskoye, Sakhaline), Osaka, then at Chirikoro,
Karafuto (now Nerpichye, Sakhaline), Otaru again, Asase, Karafuto (now
Sakhaline), Hakodate and Yokohama again.
25 September 1942:
Arrives at Ujina, Hiroshima Prefecture. CHOKO MARU
is fitted with one IJA 75mm/31-cal Type 38 field gun placed on a platform at her
stern. Four soldiers, civilian personnel, 12 workers and three gunners embark.
26 September 1942:
Departs Ujina for Pusan, Chosen (now Busan,
Korea).
27 September 1942:
Arrives at Pusan. Departs later that same day.
28 September 1942:
Arrives at Saeki, Kyushu.
29 September 1942:
Departs Saeki for Rabaul, New Britain, in convoy
“Oki” No. 4 also consisting of HAMBURG and IKUSHIMA MARUs escorted by destroyers
HATAKAZE and MINEKAZE, torpedo boat HATO and patrol boat PB-31.
13 October 1942:
Arrives at Rabaul.
20 October 1942:
Departs Rabaul for Palau in a convoy also consisting
of SHIROGANE, TOEI and IKUSHIMA MARUs with unknown escort.
26 October 1942:
Arrives at Palau.
30 October 1942:
Departs Palau for Angaur, Palaus.
31 October 1942:
Arrives at Angaur.
1 November 1943:
Departs Angaur for Miyako, Iwate Prefecture.
10 November 1942:
Arrives at Miyako.
13 November 1942:
Military personnel and civilian employees
disembark. Departs Miyako for Muroran.
14 November 1942:
Arrives at Muroran.
17 November 1942:
Departs Muroran for Yokosuka.
21 November 1942:
Arrives at Yokosuka.
E November 1942:
Army field gun is unloaded. Fittings of Navy guns
begin.
27 November 1942:
Fitted with 9 guns provided by Kure Special Navy
Landing Forces (SLNF) personnel.
30 November 1942:
Departs Yokosuka for Palau.
7 December 1942:
Arrives at Palau. Loads bauxite.
16 December 1942:
Departs Palau and arrives the same day at
Garasumao, Babeldaob (Babelthuap), Palaus.
22 December 1942:
Departs Garasumao for Moji, alone.
28 December 1942:
Minelayer NUWAJIMA joins CHOKO MARU at about
30-00N, 133-00E and provides escort N as far as off Fukajima.
31 December 1942:
Arrives at Moji.
3 January 1943:
Departs Moji for Miike.
4 January 1943:
Arrives at Miike.
7 January 1943:
Departs Miike for Palau.
14 January 1943:
Arrives at Palau.
23 January 1943:
Departs Palau and arrives that same day at
Garasumao.
28 January 1943:
Departs Garasumao for Moji. Although not in convoy,
CHOKO MARU probably is joined by SAN FRANCISCO MARU also heading north.
6 February 1943:
Arrives at Moji.
7 February 1943:
Departs Moji for Fushiki, Toyama Prefecture.
9 February 1943:
Arrives at Fushiki.
11 February 1943:
Departs Fushiki for Moji.
14 February 1943:
Arrives at Moji. Departs later that day for
Katayama, Ehime Prefecture, Shikoku.
15 February 1943:
Arrives at Katayama.
18 February 1943:
Departs Katayama and arrives the same day at
Niihama, Shikoku.
21 February 1943:
Departs Niihama for Moji.
22 February 1943:
Arrives at Moji.
23 February 1943:
Departs Moji for Takao in convoy No. 130 also
consisting of eight unidentified merchant ships escorted by patrol boat PB-36.
The convoy splits into three parts shortly after leaving port. CHOKO MARU is
probably in the third part of the convoy.
27 February 1943:
The first part arrives at Takao.
28 February 1943:
The second and third parts arrive at Takao.
5 March 1943:
Departs Takao for Manila, Luzon, Philippines in convoy
No. 739 also consisting of two unidentified merchant ships escorted by auxiliary
gunboat CHOJUSAN MARU.
8 March 1943:
Arrives at Manila.
10 March 1943:
Departs Manila for Makassar, Celebes (now Sulawesi).
16 March 1943:
Arrives at Makassar.
28 March 1943:
Departs Makassar for Pomalaa, Celebes.
29 March 1943:
Arrives at Pomalaa.
16 April 1943:
Departs Pomalaa for Makassar.
17 April 1943:
Arrives at Makassar.
20 April 1943:
Departs Makassar for Manila.
27 April 1943:
Arrives at Manila.
1 May 1943:
Departs Manila for Takao in convoy No. 845 also
consisting of NISHIYAMA (SEIZAN), AWAJI and ASAKA MARUs escorted by kaibokan
MATSUWA.
4 May 1943:
Arrives at Takao.
6 May 1943:
Departs Takao for Kanmon channel, Shimonoseki in convoy
No. 259 also consisting of seven unidentified merchant ships escorted by
destroyer HOKAZE
11 May 1943:
Arrives at Shimonoseki. Departs later for Niihama.
12 May 1943:
Arrives at Niihama.
16 May 1943:
Departs Niihama for Kure.
17 May 1943:
Arrives at Kure. Departs later for Miike.
19 May 1943:
Arrives at Miike.
20 May 1943:
Departs Miike for Wada-Misaki.
22 May 1943:
Arrives at Wada-Misaki. Departs later for Yokosuka.
25 May 1943:
Arrives at Yokosuka.
26 May 1943:
Departs Yokosuka for Chichi-Jima in convoy also
consisting of TOKO and KAIKO MARUs escorted by auxiliary minelayer TOSHI MARU
No.8. SHINYO MARU probably joins the convoy off Chichi-Jima.
30 May 1943:
Arrives at Chichi-Jima.
31 May 1943:
Departs Chichi-Jima for Saipan.
4 June 1943:
Arrives at Saipan.
14 June 1943:
Departs Saipan and arrives the same day at Rota,
Marianas.
19 June 1943:
Departs Rota for Saipan.
20 June 1943:
Arrives at Saipan.
3 July 1943:
Departs Saipan for Yokohama, alone.
11 July 1943:
Arrives at Yokohama. Then transfers to Yokosuka.
E July 1943:
Her registered port is changed for Tokyo.
16 July 1943:
Departs Yokosuka for Muroran.
24 July 1943:
Arrives at Muroran.
26 July 1943:
Departs Muroran for Same, Aomori Prefecture.
27 July 1943:
Arrives at Same.
2 August 1943:
Departs Same for Nagoya.
10 August 1943:
Arrives at Nagoya.
13 August 1943:
Departs Nagoya.
E August 1943:
Calls at Wakamatsu, Fukuoka Prefecture and departs for
Dairen, Chosen (now Dalian, Korea).
21 August 1943:
Arrives at Dairen.
25 August 1943:
Departs Dairen for Kobe.
31 August 1943:
Arrives at Kobe.
5 September 1943:
Departs Kobe.
E September 1943:
Calls at Kure, Tamano, Osaka, Shimonoseki, then
Truk.
17 September 1943:
At 0600 arrives at Truk escorted by subchaser
CH-30.
20 September, 1943:
At 1300 departs Truk in convoy No. 4920 also
consisting of SHINYUBARI and CHIYO MARUs escorted by destroyer OITE.
21 September 1943:
About 80 nms W of Onoun (Ulul), Ororu Shoto,
Carolines. LtCdr (later Rear Admiral) Roy M. Davenport (USNA ’33)'s USS HADDOCK
(SS-231) intercepts the convoy. At 1821, Davenport torpedoes and damages
SHINYUBARI MARU at 08-53N, 148-30E. In the same attack, OITE is hit by a dud
torpedo. The convoy resumes his course to Saipan.
24 September 1943:
Arrives at Saipan.
30 September 1943:
Arrives at Sasebo.
4 October 1943:
Departs Sasebo for Seito (Tsingtao) (now Qingdao),
China.
7 October 1943:
Arrives at Seito.
10 October 1943:
Departs Seito for Dairen.
11 October 1943:
Arrives at Dairen.
14 October 1943:
Departs Dairen for Muroran.
20 October 1943:
Arrives at Muroran.
26 October 1943:
Departs Muroran for Kawasaki, Kanagawa Prefecture.
29 October 1943:
Arrives at Kawasaki.
31 October 1943:
Departs Kawasaki and arrives the same day at Tokyo.
E November 1943:
Loads building materials, fuel, assorted goods,
towing materials and other sundries.
5 November 1943:
Departs Tokyo and arrives later that day at
Yokosuka.
E 6-7 November 1943:
Joins six other cargo ships. Replenishes boiler
water. Five passengers embark.
7 November 1943:
Departs Yokosuka for Truk in convoy No. 3107 also
consisting of tanker UNYU MARU No. 2 escorted by torpedo boat OTORI.
20 November 1943:
Arrives at Truk.
E November 1943:
Replenishes boiler water. Two of the three
passengers aboard disembark.
23 November 1943:
At 1400, departs Truk for Kwajalein, Marshalls, in
convoy No. 5233 also consisting of NIPPO MARU and NANKAI MARU No. 2, the latter
towing “special” craft No. 35, escorted by cable-layer TATEISHI and subchaser
CH-40. [4] [5]
1 December 1943:
At 0830 the convoy arrives at Kwajalein less NIPPO
MARU that was previously detached for Ponape, Carolines.
5 December 1943:
While still unloading cargo including 50-gallon
barrels of fuel, a Task Force 51 air strike consisting of 27 Douglas
"Dauntless"SBD dive-bombers and Grumman "Avenger"TBF torped-bombers attacks
ships in Kwajalein atoll. At 0520, CHOKO MARU is hit by two bombs in her No. 4
hold and her engine room that both are set afire. Shortly after, a second strike
consisting of 22 aircraft attacks. At 0535, another bomb causes her No. 5 hold
to burst in flames in a vast explosion. All day long, damage parties try to
extinguish the fires and save the ship.
6 December 1943:
At 0200, despite damage parties efforts, the fires
continue their progression. CHOKO MARU's No. 4 and No. 5 holds partially flood.
At 0300, her engine room floods about 65 ft long. At 0420, CHOKO MARU’s list
increases rapidly and the sea begins to wash her port deck. Orders to abandon
the ship are given. At 0437, listing heavily to port, she begins to sink by her
stern about 1.5 nms WSW of Little Bustard Island (Orubeppu). Four crewmen are
KIA.
5 February 1944:
Removed from the Navy List under internal order No.
305.
Authors Notes:
[1] Not to be confused with the other ships bearing the same
name like Teikoku Kisen’s cargo (’20, 6783 GRT), auxiliary net-layer (’40, 889
GRT), auxiliary stores ship (’24, 1794 GRT), raised transport (ex-British HSIN
YANGTSE) (’27, 921 GRT) and Taiyo Gyogyo’s cargo (’40, 842 GRT).
[2] See
Zatsuyosen home page for a full explanation.
[3] There were two categories
of Zatsuyosen. (Ko) category with an IJN Captain as supervisor aboard and (Otsu)
category without.
[4] CH-40 apparently was detached from convoy No. 5233 and
made port at Rabaul on or before 26 November.
[5] Some sources say CH-30
rather than CH-40.
Thanks go to Gengoro S. Toda of Japan.
-Gilbert Casse, Bob Hackett and Peter Cundall
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