© 2006-2016 Bob Hackett, Sander Kingsepp and Peter CundallRevision 9
5 October 1943:
Tokyo Bay. Laid down at Yokosuka Navy Yard as kaibokan No.
15 January 1944:
Launched and numbered CD-12.
15 February 1944:
Reserve LtCdr Ishikawa Mutsuo (former CO of the
auxiliary gunboat OKUYO MARU) is appointed Chief Equipping Officer of CD-12,
CD-14, and CD-16.
22 March 1944:
Completed and registered in the IJN. Attached to Kure
Naval District. Assigned to Kure Guard Force. Reserve LtCdr Ishikawa Mutsuo is
21 April 1944:
At 1100 departs Yokosuka on trials.
22 April 1944:
Arrives back at Yokosuka.
28 April 1944:
At 0600, CD-12 departs Tokyo with kaibokan NOMI, CD-18,
CD-22, minesweeper W-27 and submarine chasers CH-16 and CH-18, escorting
"Higashi Matsu" Convoy No. 7 (outbound), consisting of TATSUHARU, MITAKESAN,
ASAHISAN, OKINAWA, YAMATAMA, BINGO, MEIRYU, MOJI and MIHO MARUs bound for Saipan;
ASAKA MARU and landing ships T.128 and T.150 for Palau; KOSHIN and BOKUYO
(MUTSUYO) MARUs for Yap and TAITO MARU for Chichi Jima.
29 April 1944:
At 1230 W-27 is detached and returns to Nagaura.
E 5 May 1944:
CD-12, ASAKA MARU, landing ships T.128 and T.150 arrive
18 May 1944:
At 0500, CD-12 departs Palau for Saipan with auxiliary
minesweeper FUMI MARU No. 2, auxiliary SHOHO MARU and auxiliary subchasers
CHa-62 and URUPPU MARU, escorting the "Asaka Maru" convoy, consisting of ASAKA,
JINZAN, TENRYUGAWA and BOKUYO MARUs.
21 May 1944:
At 0925, LtCdr Vernon C. Turner's (USNA '33) USS BILLFISH
(SS-286) torpedoes and damages BOKUYO MARU. TENRYUGAWA MARU, covered by CD-12,
takes BOKUYO MARU in tow.
23 May 1944:
At 0012, URUPPU MARU joins CD-12, escorting the towing
group. At daybreak, aerial cover is provided from Saipan.
24 May 1944:
The main body of the convoy arrives at Saipan.
27 May 1944:
At 2137, CD-12, URUPPU MARU and the towing group arrive
31 May 1944:
At 0600, CD-12 departs Saipan for Yokosuka with destroyer
HATAKAZE, minelayer SARUSHIMA, minesweeper W-20, auxiliary minesweeper FUMI MARU
No. 2 and auxiliary stores ship TAKUNAN MARU escorting convoy No. 4530,
consisting of HAKUSAN, JINZAN, EIKO, NATSUKAWA, SHUNSEN, KAIKO and CHIYO MARUs
and UNYO MARU No. 8.
2 June 1944:
250 miles W of Uracas Island. At 2207, CHIYO MARU is
attacked by LtCdr Edward N. Blakely's (USNA '34) USS SHARK (SS-314) and hit by
two torpedoes port side under the rear of the bridge. About ten minutes later,
CHIYO MARU sinks at 21-00N 140-30E, taking down 97 of her 143 passengers and
five crewmen. CD-12 and the other escorts counter-attack and drop a total of 39
depth-charges, but without damage to USS SHARK.
4 June 1944:
317 miles WSW of Iwo Jima. At 0405, HAKUSAN MARU is
attacked by LtCdr John D. Crowley's (USNA '34) USS FLIER (SS-250) and hit port
side by two of three torpedoes he fires. At 0415, HAKUSAN MARUís stern rises
vertically and she sinks at 22-37N 136-50E. 23 crewmen, nine gunners, 16 of 71
troops and 277 of 375 passengers (mostly women and children) are KIA. CD-12 and
the other escorts counterattack and drop 34 depth-charges, but without damage
to USS FLIER.
8 June 1944:
At 0800, the remainder of the convoy arrives at Yokosuka.
25 June 1944:
At Nagaura, near Yokosuka.
5 July 1944:
Arrives back at Nagaura.
10 July 1944:
At 0500, CD-12 departs Nagaura for Iwo Jima and Chichi
Jima with destroyers WAKABA and HATSUHARU, kaibokan AMAKUSA, minesweeper W-27
and auxiliary subchaser FUMI MARU escorting convoy No. 3710, consisting of
NISSHU, TAISEI, TONEGAWA, DAIJI and EIKO MARUs and TOKAI MARU No. 4.
12 July 1944:
At 1500, CD-12 and AMAKUSA are detached with NISSHU,
TAISEI and TONEGAWA MARUs and head for Iwo Jima.
14 July 1944:
Arrives at Iwo Jima. The merchant ships unload and
15 July 1944:
Arrives at Chichi Jima.
16 July 1944:
CD-12 departs Chichi Jima with destroyer WAKABA and
HATSUHARU and kaibokan AMAKUSA and minesweeper W-27 escorting convoy No. 3716,
consisting of TAISEI, TONEGAWA and EIKO MARUs.
19 July 1944:
At 1025, convoy No. 3716 arrives at Yokosuka.
29 July 1944:
Subchasers CH-52 and CH-51 depart Tateyama for
Chichi Jima with destroyer escort MATSU, flagship of the 2nd Convoy Escort
Group's Commander Rear Admiral Takahashi Ichimatsu (40)(former CO of TSUGARU),
destroyer HATAKAZE, kaibokan CD-4 and Navy transports/landing ships T.2 and
T.4, escorting convoy No. 3729, consisting of SHOGEN, TONEGAWA, ENJU, KYUSHU
and HOKKAI MARUs and UNKAI MARU No.7.
That same day, light carrier ZUIHO, escorted by destroyer FUYUTSUKI,
sorties from Yokosuka to provide air and anti-submarine cover for the convoy.
1 August 1944:
Convoy No. 3729 arrives at Futami Harbor, Chichi Jima.
Upon arrival, some of the cargo ships depart for Iwo Jima. Bad weather causes
delays in unloading. ZUIHO and FUYUTSUKI, after maintaining position near the
lzu Shichi Islands, make for the West Inland Sea.
4 August 1944:
About 0930, an air raid warning is received from Tokyo.
All ships proceed to sea in convoy No. 4804. From 1030 on, the convoy is
attacked by three waves of aircraft of Rear Admiral (later Admiral) Joseph J.
Clark's (USNA '17) (former CO of USS YORKTOWN, CV-10) Task Group 58.1. The
first wave attacks the convoy 20 miles NW of Chichi Jima. Destroyer HATAKAZE
suffers rudder damage. At about 1100, kaibokan CD-4 is near-missed by bombs fore
and aft to starboard. She suffers slight damage with two men KIA. The Japanese
claim shooting-down several aircraft.
In the second raid, ENJU MARU is sunk with the loss of 52 crewmen and 21
passengers. The third strike occurs between 1600 and 1630, during which the
majority of the ships succumb to torpedo attacks from both sides of the convoy.
CD-12 incurs some damage. After organizing the rescue of the convoy's survivors,
flagship MATSU leads the still intact escort group and TONEGAWA MARU, the lone
surviving cargo ship, northwards.
At 1254, Rear Admiral (later Admiral) Laurance T. DuBose's Task Unit
58.1.6, consisting of CruDiv 13's USS SANTA FE (F) (CL-60), USS MOBILE (CL-63),
USS BILOXI (CL-80) and USS OAKLAND (CL-95), DesDiv 100's USS COGSWELL (DD-651),
USS INGERSOLL (DD-652) and USS KNAPP (DD-653) and DesDiv 91's USS IZARD
(DD-589), USS CHARRETTE (DD-581), USS BURNS (DD-588) and USS BROWN (DD-546) is
detached to sink the cripples.
At 1800, CD-4 sights DuBose's warships closing from the south. Rear
Admiral Takahashi Ichimatsu (40) orders CD-4 to protect TONEGAWA MARU and
continue fleeing while his flagship MATSU attempts to draw off the Americans. At
1930, MATSU is taken under fire and sunk by shell fire of USS COGSWELL, USS
INGERSOLL and USS KNAPP at 27-40N, 141-48E. Rear Admiral Takahashi is KIA as are
all but six of MATSU's crew. He is promoted Vice Admiral, posthumously.
Later, the Americans overtake and sink TONEGAWA MARU with 83 crewmen and
61 troops KIA. CD-4, CD-12, HATAKAZE and subchaser CH-51 escape.
5 August 1944:
Arrives at Yokosuka.
15 August 1944:
Departs Yokosuka with light cruiser YASOJIMA and
IOSHIMA, auxiliary minesweeper TOSHI MARU No. 8, Naval transport landing ship
T.134 and kaibokan CD-4 in convoy No.3815, consisting of SHORYU MARU and HIYOSHI
MARU No. 2 GO. The warships are carrying supply drums with ammunition and food
for the garrison of Iwo Jima. The merchant ships only proceed as far as
Haha-Jima.The convoy arrives at Tateyama and anchors there.
17 August 1944:
21 August 1944:
Arrives at Haha Jima.
23 August 1944:
Departs Haha Jima.
25 August 1944:
After sundown, the escorts and T-134 arrive off the
coast of Iwo Jima. After establishing the contact with shore units, the drums
are released offshore.
29 August 1944:
CD-12 returns to Yokosuka.
6 September 1944:
CD-12 departs Yokosuka for Haha Jima with light
cruiser YASOJIMA (ex-Chinese P'ING HAI) and kaibokan CD-4 and auxiliary
subchaser FUMI MARU escorting convoy No. 3905 consisting of SHORYU and TOKIWASAN
E 7 September 1944:
Arrives at Tateyama.
9 September 1944:
At 1520, the convoy departs Tateyama. At about
1600, shortly after the ships leave port, LtCdr Anton R. Gallaher's (USNA '33)
USS BANG (SS-385) torpedoes and sinks both TOKIWASAN MARU carrying the 1st
Shinyo Air Base Group and taking down nine crewmen and 14 passengers, and SHORYU
MARU with the loss of four of her crew and 64 passengers, at 28-58N, 137-45E.
11 September 1944:
The escorts arrive at Chichi Jima.
12 September 1944:
Departs Chichi Jima.
14 September 1944:
Arrives at Nagaura and undergoes repairs.
23 September 1944:
CD-12 departs Yokohama with submarine chasers CH-44
and CH-51, escorting convoy No. 3923, consisting of IKUTAGAWA, SHIBAZONO MARUs
and Oil Tanker No. 3998, bound for Chichi Jima. En route IKUTAGAWA MARU is
detached at Hachijo Jima. The convoy anchors at Tateyama.
30 September 1944:
Arrives at Chichi Jima early that day. At 2200
CD-12 departs Chichi Jima with submarine chasers CH-44 and CH-51 escorting
convoy No. 4930, consisting of SHIBAZONO MARU and Oil Tanker No. 3998, bound for
4 October 1944:
At 1630 arrives at Yokosuka.
20 October 1944:
Repairs are completed.
24 October 1944:
CD-12 and submarine chaser CH-42 depart Yokohama
escorting convoy No. 3024, consisting of JUZAN MARU No. 1 and RYUJIN MARU. The
ships later arrive at Tateyama.
25 October 1944:
29 October 1944:
Arrives at Haha Jima. RYUJIN MARU is joined by
auxiliary minesweeper KEINAN MARU and proceeds to Chichi Jima. The rest of the
convoy remains at Haha Jima.
30 October 1944:
CD-12 and submarine chaser CH-42 depart Haha Jima
escorting convoy No. 4030, consisting of JUZAN MARU No. 1, bound for Yokosuka.
3 November 1944:
Arrives at Shimoda.
4 November 1944:
Departs Shimoda and later that day arrives at
7 November 1944:
Transfers from Nagaura to Yokosuka.
16 November 1944:
25 November 1944:
Arrives back at Yokosuka.
12 December 1944:
At 1415, CD-12 departs Tateyama for Chichi Jima with
CD-6, minesweeper W-29 and subchaser CH-42, escorting convoy No. 3209,
consisting of JUZAN, YAEI, KAIKO and SHOTO MARUs.
13 December 1944:
The convoy encounters bad weather and at 1136 puts
into Hachijo-Jima. At 1653, the same day, it departs.
16 December 1944:
At 0229, LtCdr Robert R. Williams Jr's (USNA '34)
USS FINBACK (SS-230) torpedoes and sinks JUZAN MARU at 27-24N, 141-44E. 33
crewmen are KIA. Williams fires several torpedoes at W-29 and CH-42, but misses.
There is no counter-attack. Later that day, the convoy arrives at Chichi Jima
17 December 1944:
The convoy, now numbered No. 4217, departs
22 December 1944:
At 0314, the convoy arrives at Tateyama.
27 December 1944:
CD-12 departs Tateyama with submarine chaser CH-42
and minesweeper W-29 in convoy No. 3226 consisting of YAEI, SHIBAZONO, YONEYAMA
MARUs and NANYO MARU No. 1.
31 December 1944:
Arrives at Chichi Jima.
1 January 1945:
At 1700, CD-12 departs Chichi Jima for Tateyama with
minesweeper W-29 and subchaser CH-42 escorting convoy No. 4101, consisting of
SHIBAZONO, YONEYAMA, YAEI MARUs and NANYO MARU No.1.
3 January 1945:
At 2030, LtCdr Talbot E. Harper's (USNA '37) USS
KINGFISH (SS-234) torpedoes and sinks SHIBAZONO MARU at 30-21N, 142-15E. 57
crewmen are KIA. Harper also torpedoes and sinks small freighter YAEI MARU. 27
crewmen, two gunners and two passengers are KIA. CD-12 and subchaser CH-42
counterattack, but their attack is not recorded by USS KINGFISH.
6 January 1945:
At 0918, the convoy arrives at Tateyama. Late that day
transfers from Tateyama to Yokosuka.
15 January 1945:
Departs Yokosuka and later that day arrives at
16 January 1945:
At 1200, CD-12 departs Tateyama for Chichi Jima with
kaibokan CD-56, subchasers CH-42, CH-47 and minesweeper W-29, escorting convoy
No. 3115, consisting of KURETAKE, YONEYAMA MARUs and NANYO MARU No. 1 and UNYO
MARU No. 6.
19 January 1945:
At 1046, the convoy is attacked by a group of large
American aircraft, but the attack is beaten off. Arrives at Futami, Chichi
20 January 1945:
At 0013, CD-12 departs Chichi Jima for Tateyama with
kaibokan CD-56, and minesweeper W-29, escorting convoy No. 4119, consisting of
KURETAKE MARU and NANYO MARU No. 1.
23 January 1945:
At 0100, the convoy arrives at Tateyama. Later that
day the convoy arrives at Tokyo Bay and the escorts detach at Yokosuka.
30 January 1945:
Transfers from Yokosuka to Yokohama.
31 January 1945:
Departs Yokohama with minesweeper W-29 for
Chichi Jima escorting convoy No. 3131, consisting of RYUJIN MARU and one
unidentified ship (name ending in San/Yama). Later that day arrives at Tateyama.
1 February 1945:
At 0300 departs Tateyama with auxiliary submarine
chaser TAKUNAN MARU No. 2 as an additional escort.
4 February 1945:
At 0740 arrives at Chichi Jima.
7 March 1945:
At 1100 arrives at Yokosuka.
11 March 1945:
At 0900 departs Yokosuka.
14 March 1945:
At 1700 arrives at Moji.
18 March 1945:
At 1100 departs Moji.
19 March 1945:
Transferred to AS-3 anti submarine unit.
Early April 1945:
CD-12 arrives in Miyazu Bay, Sea of Japan. She
serves as a provisional target for the aircraft from the Mineyama Detachment of
20 April 1945:
During a low-level training flight a Yokosuka K5Y1 Type
93 Intermediate Trainer grazes the mast of CD-12, riding at anchor. The aircraft
crashes, killing both pilots.
27 May 1945:
Korea Strait, off Geomundo Island. Kaibokan AGUNI and
OKINAWA are attacked by two Consolidated PB4Y-2B "Privateers"of Patrol Bombing
Squadron VPB-109. Lt Leo E. Kennedy launches a radar-guided "Bat" glide bomb.
The bomb's 1,000-lb warhead explodes off AGUNIís starboard bow demolishing the
whole foredeck area. CD-12 is dispatched to assist in rescuing AGUNI's crew, but
despite the heavy damage AGUNI remains navigable and proceeds stern first to
15 August 1945:
At Maizuru CD-12's crew receives notification of the
termination of war.
30 November 1945:
Removed from the Navy List.
1 December 1945:
Assigned to minesweeping duties by the Allied
Occupation Forces. 
5 September 1947:
Ceded to the United States as a war reparation.
10 September 1947:
Sasebo. Start of scrapping.
30 November 1947:
End of scrapping.
 USS FLIER, while transiting the Balabac Strait,
Philippines, on 13 August 1944 struck a mine and sank. Fourteen of 86 crewmen
escaped, but only eight survived the long swim in the Sulu Sea to shore. After
making their way by raft to Palawan, at the end of the month they were evacuated
by USS REDFIN (SS-272). In the spring of 2009, a dive team from YAP Films
located the wreckage of the submarine at a depth of 330 feet. On 1 February
2010, the USN confirmed that the submarine is FLIER.
 In 1945, the U. S. Army Air Force launched a five-phased campaign
known as "Operation Starvation" to mine Japanís home waters. The USAAF used 80
to 100 B-29 "Superfortress" heavy bombers of the 21st Bomber Command based at
Tinian in the Marianas. The B-29s could carry seven 2,000 lb. or twelve 1,000
Beginning on 27 March 1945 and continuing until 5 August 1945, the B-29s
flew 1,529 nighttime radar sorties and laid 4,900 magnetic, 3,500 acoustic,
2,900 pressure and 700 low-frequency mines for a total of more than 12,000 mines
laid in Japanese waters. These mines sank 294 ships, damaged 137 beyond repair
and damaged another 239 that could be repaired. The total was 1,250,000 tons
sunk or damaged or about 75 percent of Japanese shipping available in March
1945. Only 15 B-29s were lost during the mining campaign.
Postwar, removal of these mines posed a major challenge for the Allied
Occupation Forces. They pressed 269 Japanese ships of various types into
minesweeping service to augment their own efforts.
Thanks for assistance to Mr. Gilbert Casse of France
-Bob Hackett, Sander Kingsepp and Peter Cundall