1 April 1942:
Meanwhile, at 1100, Vice Admiral Ozawa Jisaburo's (former CO of HARUNA) Second Expeditionary Fleet, Mobile Force departs Mergui and steams into the Bay of Bengal to attack merchant shipping with CruDiv 4's CHOKAI (F) and CruDiv 7's
SUZUYA, KUMANO, MIKUMA and MOGAMI, light cruiser YURA and destroyers AYANAMI, YUGIRI, ASAGIRI and SHIOKAZE. YURA and CHOKAI support CarDiv 4's light carrier RYUJO.
4 April 1942:
350 nms S of Ceylon. About 1600, the carrier Striking Force is located by a Consolidated PBY "Catalina" QL-A seaplane of 413 Squadron, Royal Canadian Air Force (RCAF) flown by squadron leader Leonard Birchall, out
of Koggala. Birchall manages to radio in the position of the Japanese fleet and alert Colombo about the impending attack before his Catalina is shot down by six A6M2 Zeke fighters from carrier HIRYU. Birchall is one of the six survivors of the crew of nine.
5 April 1942, Easter Sunday: The Attack on the British naval base at Columbo:
At 0730, 127 aircraft from the Striking Force (53 Nakajima B5N2 “Kate” dive-bombers [18 from SORYU, 18 from HIRYU and 17 from AKAGI], 38 Aichi D3A1 “Val” torpedo-bombers [19 each from
SHOKAKU and ZUIKAKU] and 36 Mitsubishi A6M “Zeke” fighters (9 each from AKAGI, SORYU, HIRYU and ZUIKAKU) of the "Kido Butai's" aircraft, led by Cdr (later Captain) Fuchida Mitsuo (of Pearl Harbor), attack the British naval base at
Columbo, Ceylon(now Sri Lanka).
The planes damage the base's facilities, destroy at least 26 aircraft (6 Fairey "Swordfish", 4 Fairey "Fulmars" and at least 16 Hawker "Hurricanes") and sink destroyer HMS TENEDOS undergoing refit, armed merchant cruiser HMS HECTOR
and 5834-ton Norwegian tanker SOLI. The planes also damage submarine TRUSTY, submarine tender LUCIA, 5,943-ton British freighter BENLEDI and British freighter CLAN MUROCH. 81 civilians and 56 RN personnel are killed at Colombo (TENEDOS 33, HECTOR 4, LUCIA 2, TRUSTY 1, FAA
aircrew and ground crew 12. The Japanese lose seven aircraft (6 D3A Vals, 1 A6M Zeke).
A Kawanishi E7K "Alf" three-seat float biplane from cruiser TONE finds Vice Admiral (later Admiral of the Fleet Sir) James Somerville's (former CO of HMS NORFOLK) British Eastern Fleet's cruisers HMS CORNWALL and HMS DORSETSHIRE at
sea - without air cover. Between 1338-1400, 53 D3A Val dive-bombers (17 from AKAGI, 18 from HIRYU and 18 from SORYU, led by LtCdr Egusa Takashige (SORYU’s Air Group Commander), sink both ships. 424 RN personnel are killed (DORSETSHIRE
234, CORNWALL 190). After the attack, the Striking Force withdraws to the SE and searches unsuccessfully for the rest of Somerville's fleet.
Meanwhile, at 2030, Ozawa's Mobile Force separates into three groups to attack merchant shipping in the Bay of Bengal. CruDiv 7/1's KUMANO and SUZUYA, under Rear Admiral Kurita, form the Northern Group with destroyer SHIRAKUMO.
Carrier RYUJO, CHOKAI, SubRon 5's light cruiser YURA, Des Div 20's YUGIRI and ASAGIRI form the Center Group under Admiral Ozawa. MOGAMI, MIKUMA and destroyer AMAGIRI form the Southern Group.
6 April 1942:
Bay of Bengal. 14 miles E of Calingapatam. YURA and YUGIRI sink 1,279-ton Dutch merchant BATAVIA enroute from Calcutta to Karachi. YURA and YUGIRI also sink 1,279-ton Dutch freighter BANJOEWANGI and 3,471-tonBritish steamer TAKSANG.
Bay of Bengal. After 0730, KUMANO and SUZUYA and destroyer SHIRAKUMO attack a six-ship convoy and sink 4,986-ton American Export Line’s EXMOOR (ex-CITY OF ST. JOSEPH), 9,066-ton British freighter MALDA, 7,621-ton British freighter AUTOCLYCUS and 2,441-ton British freighter SHINKUANG at 19N, 86E. Ozawa's cruisers also sink 6,622-ton British freighter INDORA and Captain J. H. Gregory’s British India Line’s 4,921-ton cargo ship SILKSWORTH. About 50 of SILKSWORTH's mostly Chinese crewmen survive.
25 miles S of Vizagapatam, northern Indian coast. CHOKAI’s floatplanes bomb and sink 5,686-ton American freighter SELMA CITY and 6,426-ton British cargo ship GANGES.
Bay of Bengal. RYUJO's aircraft bomb 5,491-ton American freighter BIENVILLE. She is finished off by a torpedo from CHOKAI.
That same day, CHOKAI sinks 6,426-ton British cargo ship GANGES and RYUJO launches strikes against Cocanada and Vizagapatam. RYUJO's aircraft bomb and sink 2,441 ton British steamship SINKIANG and damage 2,073-ton Dutch freighter
VAN DER CAPELLEN that sinks two days later. RYUJO's aircraft also damage 5,268-ton British freighter ANGLO CANADIAN and 3,827-ton British merchant MARION MOLLER.
9 April 1942: The Attack on the British naval base at Trincomalee:
At 0600, Nagumo's Striking Force launches 127 aircraft led by Cdr Fuchida to attack the British naval base at Trincomalee, Ceylon (91 B5N2 Kate dive-bombers [18 from AKAGI, 18 from SORYU and 18 from HIRYU], 19 from SHOKAKU and 18 from
ZUIKAKU] and 41 A6M2 Zeke fighters [6 from AKAGI, 9 from SORYU, 6 from HIRYU, 10 from SHOKAKU and 10 from ZUIKAKU
The Japanese find the harbor almost empty, but sink 9,066-ton British merchant SAGAING and a "Walrus" amphibian and three crated Fairey “Albacore” aircraft she was carrying and damage old 15-inch monitor HMS EREBUS. They also seriously damage the dockyard and the RAF station at
China Bay, shoot down nine planes and destroy at least 14 aircraft on the ground. 20 military and 38 civilian personnel are killed at Trincomalee including EREBUS 9, naval dockyard personnel 17, 55th LAA Battery 2, and at China Bay 3.
The Japanese lose seven aircraft (4 D3A Vals, 3 A6M Zekes).
10 nms off Godavari coast, Madras. At 1314, Captain Eilif Steier’s 1,515-ton Norwegian cargo ship HERMOD, enroute from Calcutta for Colombo, is fired upon by three warships, probably MOGAMI, MIKUMA and destroyer AMAGIRI. In just eight
minutes, HERMOD sinks. Two Japanese floatplanes appeared and circle the life boats, but do not fire on them. All 36 of HERMOD’s crew survive.
HARUNA launches a E8N2 “Dave” floatplane. At 0755, it spots an enemy carrier 65 miles south of the base. At 0900, the Striking Force launches 85 D3A Vals, (18 from SORYU, 18 from HIRYU and 18 from SHOKAKU, 17 from AKAGI and 14
from ZUIKAKU),escorted by 9 A6M Zekes (3 each from AKAGI, SORYU, HIRYU) which sink old light carrier HMS HERMES. 306 RN personnel are KIA, but hospital ship VITA, en route from Trincomalee to Colombo, arrives and picks up over 600
Other sailors are rescued by local craft or swim to shore. Nagumo's aircraft also find and sink Australian destroyer HMAS VAMPIRE, 8 KIA, corvette HMS HOLLYHOCK, 53 KIA, oilers ATHELSTANE and BRITISH SERGEANT and Norwegian merchant
During the day, nine of the Royal Air Force’s No. 11 Squadron’s Bristol "Blenheim" bombers attack KONGO, but score no hits and lose five of their number to Nagumo's Combat Air Patrol’s "Zekes". BatDiv3 and the Striking Force continue
6-9 April 1942:
11 April 1942:
Ozawa's commerce raiding detachment sinks twenty ships during their brief foray in the Bay of Bengal.
Arrives at Singapore.
13 April 1942:
CruDiv7 departs Singapore.
16 April 1942:
CruDiv7 is at Camranh.
22 April 1942:
CruDiv7 arrives at Kure.
4 May 1942:
Drydocked for overhaul and hull scraping.
12 May 1942:
15 May 1942:
CruDiv 7 departs Kure for three days of exercises with BatDiv 1's YAMATO, NAGATO and MUTSU in the area around Hashirajima.
18 May 1942:
Arrives back at Kure.
22 May 1942:
CruDiv7 departs Hashirajima that night.
26 May 1942:
CruDiv 7 arrives at Guam (renamed Omiyajima) to provide close support for Rear Admiral (later Vice Admiral) Tanaka Raizo's (former CO of KONGO) Midway Invasion Transport Group's oiler AKEBONO MARU and transports KIYOZUMI MARU, ZENYO MARU, TOA MARU No. 2, ARGENTINA MARU, BRAZIL MARU, AZUMA MARU, KEIYO MARU, GOSHU MARU, KANO MARU, HOKURIKU MARU, KIRISHIMA MARU and NANKAI MARU. The transports carry 5,000 troops.
MOGAMI refuels from an oiler.
28 May 1942:
Departs Guam with Rear Admiral Fujita Ruitaro's (former CO of FUSO) Seaplane Tender Group's CHITOSE and KAMIKAWA MARU of the Close Support Group.
30 May 1942:
Makes a rendezvous with the Transport Group with ARASHIO, ASASHIO and oiler NICHIEI MARU.
5 June 1942: Operation "MI" - The Battle of Midway:
The Commander-in-Chief of the Combined Fleet, Admiral (Fleet Admiral, posthumously) Yamamoto Isoroku (former CO of AKAGI) orders Midway to be shelled. CruDiv 7 is tasked to accomplish the shelling at 1050 (I). CruDiv 7 and DesDiv 8 are 410 miles away from the island, so they make a high-speed dash at 35 knots. The sea is choppy and the destroyers lag behind. At 2120, the order is canceled.
At 2138, flagship KUMANO spots surfaced submarine USS TAMBOR (SS-198). KUMANO signals a 45° simultaneous turn to starboard to avoid possible torpedoes. The emergency turn is correctly executed by flagship and SUZUYA, but the third ship in the line, MIKUMA, erroneously makes a 90° turn. Behind her, MOGAMI turns 45° as commanded. MOGAMI's navigator, LtCdr (later Captain) Yamauchi Masaki, watching SUZUYA does not see MIKUMA's movement. This results in a collision in which MOGAMI rams MIKUMA´s portside below the bridge. MOGAMI's bow caves in and she is badly damaged. MIKUMA's portside oil tanks rupture and she begins to spill oil, but otherwise her damage is slight.
After learning about the collision, the Commander of the Second Fleet, Vice Admiral (later Admiral) Kondo Nobutake (former CO of KONGO) orders Admiral Kurita to have DesDiv 8's ARASHIO and ASASHIO stay behind and escort MOGAMI and MIKUMA. Flagship KUMANO and SUZUYA are detached. The MOGAMI group proceeds westward at reduced speed.
6 June 1942:
At 0534, retiring MOGAMI and MIKUMA are attacked by eight Boeing B-17 "Flying Fortresses" from Midway. They bomb from high altitude and fail to score any hits. At 0805, six Douglas SBD "Dauntless" dive-bombers and six Vought-Sikorsky SB2U "Vindicators" from the 2nd Marine Air Wing on Midway attack MIKUMA and MOGAMI. They score several near-misses, but one bomb hits the Warrant Officers' Mess. A Vindicator crashes into MIKUMA's aft turret.
MOGAMI and MIKUMA are heading for Wake Island when they are attacked by three waves of 81 SDB dive-bombers from USS ENTERPRISE (CV-6) and the HORNET (CV-8). ARASHIO and ASASHIO are each hit by a bomb. MIKUMA is hit by at least five bombs and set afire. Her torpedoes ignite and the resultant explosions destroy the ship and later she sinks. MOGAMI is hit by six bombs. Her No. 5 turret is destroyed. 81 crewmen are killed.
MOGAMI and the destroyers rescue 240 survivors, then abandon sinking MIKUMA and depart for Truk. Later, MOGAMI refuels from oiler NICHIEI MARU.
8 June 1942:
MOGAMI rejoins CruDiv 7.
14 June 1942:
Arrives at Truk. Undergoes temporary repairs by repair ship AKASHI.
20 June 1942:
Rear Admiral (later Vice Admiral) Nishimura Shoji (former CO of HARUNA) assumes command of CruDiv 7.
14 July 1942:
Temporary repairs are completed. That same day, CruDiv 7 is transferred from the Second Fleet (Cruisers) to the Third Fleet (Carriers).
5 August 1942:
11 August 1942:
Arrives at Sasebo.
25 August 1942:
1 September 1942:
Drydocked. MOGAMI undergoes a major conversion to an aircraft cruiser to improve the fleet's reconnaissance capabilities. Her No. 4 turret and the damaged No. 5 turret are removed and her aft magazines are modified to serve as gasoline tanks and munitions storage. Her aft deck is extended and fitted with a system of rails to accommodate the planned stowage of 11 Aichi E16A Zuiun ("Paul") reconnaissance floatplanes.
MOGAMI's dual 25-mm. AA guns and 13-mm machine guns are removed and replaced by 10 triple mount Type 96 25-mm AA guns. A Type 21 air-search radar is fitted and most of her scuttles are welded over.
The new E16A aircraft are not available, so MOGAMI embarks three older Mitsubishi F1M2 Type 0 ("Pete") two-seat biplane observation floatplanes and four Aichi E13A1 Type O ("Jake") three-seat reconnaissance floatplanes.
10 November 1942:
Sasebo. Captain Sasaki Seigo (former CO of NATORI), CO of seaplane carrier CHITOSE undergoing conversion to a conventional aircraft cruiser, assumes command of MOGAMI "on paper" as an additional duty. Captain Sone is reassigned as CO of NACHI.
14 April 1943:
Captain Aitoku Ichiro (former CO of CVE UNYO) assumes command.
30 April 1943:
Recommissioned and assigned to the First Fleet.
1 May 1943:
2 May 1943:
Arrives at Hashirajima. Battle training thereafter.
12 May 1943: American Operation "Landcrab" - The Invasion of the Aleutians:
Rear Admiral (later Admiral) Thomas C. Kinkaid's (former CO of INDIANAPOLIS, CA-35) Task Force 16, covered by Rear Admiral Francis W. Rockwell's (former CO of THATCHER, DD-162) Task Force 51, lands the Army's 7th Division that captures Attu Island.
17 May 1943:
Admiral (Fleet Admiral, posthumously) Koga Mineichi (former CO of ISE), new CINC, Combined Fleet, sorties from Truk for Yokosuka in response to the Attu invasion with BatDiv 1's MUSASHI, CarDiv 2's JUNYO and HIYO, CruDiv 8's TONE and CHIKUMA and nine destroyers.
20 May 1943:
CruDiv 7's MOGAMI, KUMANO and SUZUYA depart Tokuyama.
22 May 1943:
CruDiv 7 arrives at Yokosuka. MOGAMI collides with oiler TOA MARU in Tokyo Bay and is damaged slightly.
That same day, Admiral Koga's task force arrives. The task force is joined by carriers ZUIKAKU, SHOKAKU and ZUIHO and light cruisers AGANO and OYODO at Yokosuka. Before this powerful force can depart for a counterattack against the Aleutians, Attu falls to the Americans.
31 May 1943:
Departs Tokyo Bay.
2 June 1943:
Arrives at Hashirajima.
2 June 1943:
Training in the Inland Sea.
8 June 1943:
At Hashirajima. Battleship MUTSU is moored midway between Hashirajima and the Suo-Oshima islands. At 1213, her No. 3 turret's magazine explodes. MUTSU breaks in two. The forward section sinks quickly but the stern section remains floating. Nearby, FUSO launches two of her boats and rescues 353 survivors. MOGAMI sends boats to rescue survivors, but they find none.
9 July 1943:
MOGAMI embarks an Imperial Army detachment and supplies at Ujina. She departs Shinagawa for Truk with CarDiv 1's SHOKAKU, ZUIKAKU and ZUIHO, escort carrier CHUYO, seaplane carrier NISSHIN, CruDiv 8's TONE and CHIKUMA, light cruisers AGANO and OYODO, DesDiv 4's ARASHI and HAGIKAZE, DesDiv 17's ISOKAZE, DesDiv 61's HATSUZUKI and SUZUTSUKI and destroyer TAMANAMI.
11 July 1943:
The task force is sighted by USS STURGEON (SS-187) and SEARAVEN (SS-196), but neither submarine is able to attack.
15 July 1943:
The task force is sighted by USS TINOSA (SS-283). ZUIHO is attacked unsuccessfully. Four torpedoes miss. The task force is also sighted by USS POGY (SS-266), but the submarine is unable to attack. The task force makes port at Truk unharmed.
19 July 1943:
MOGAMI departs Truk on a troop transport run with a task group: seaplane tender NISSHIN, cruisers TONE and CHIKUMA, light cruisers OYODO and AGANO, destroyers HATSUZUKI, SUZUTSUKI, ARASHI, HAGIKAZE and ISOKAZE.
21 July 1943:
Arrives at Rabaul. Disembarks the troops.
24 July 1943:
Departs Rabaul with cruisers TONE and CHIKUMA, OYODO and AGANO and destroyers HATSUZUKI and SUZUTSUKI.
26 July 1943:
Arrives at Truk.
18 September 1943:
The fleet sorties to Brown Island, Eniwetok in response to raids on Tarawa, Makin and Abemama launched by Rear Admiral Charles A. Pownall's (former CO of RANGER, CV-4) Task Force 15's carriers LEXINGTON (CV-16), PRINCETON (CVL-23) and BELLEAU WOOD (CVL-24).
Vice Admiral Ozawa, in tactical command, leads the fleet's first section: BatDiv 1's YAMATO and NAGATO, CarDiv 1's SHOKAKU and ZUIKAKU (followed by ZUIHO on 19 September), CruDiv 5's MYOKO and HAGURO, CruDiv 7's MOGAMI, CruDiv 8's CHIKUMA and TONE, light cruisers AGANO and NOSHIRO and destroyers.
Vice Admiral Kurita leads the second section with his Advance Force: CruDiv 4's ATAGO, TAKAO, MAYA and CHOKAI. Admiral Koga remains at Truk in the fleet's flagship, MUSASHI with BatDiv 2's FUSO and BatDiv 3's KONGO and HARUNA.
25 September 1943:
No contact is made with Task Force 15. The fleet arrives back at Truk.
5-6 October 1943:
Rear Admiral (later Vice Admiral) Alfred E. Montgomery's (former CO of RANGER, CV-4) Task Force 14's carriers USS ESSEX (CV-9), YORKTOWN (CV-10), LEXINGTON (CV-16), INDEPENDENCE (CV-22), BELLEAU WOOD (CVL-24) and COWPENS (CVL-25) launch raids on Wake Island and the Marshall Islands.
17 October 1943:
The Japanese intercept radio traffic that suggests the Americans are planning another raid on Wake. Admiral Koga sorties from Truk to Brown Atoll, Eniwetok to intercept the enemy task force with the fleet: BatDiv 1's YAMATO, MUSASHI and NAGATO, BatDiv 2's FUSO, Bat Div 3's KONGO and HARUNA, CarDiv 1's SHOKAKU, ZUIKAKU and ZUIHO, CruDiv 4's ATAGO, TAKAO, MAYA and CHOKAI, CruDiv 7's SUZUYA and MOGAMI, CruDiv 8's CHIKUMA and TONE and light cruisers AGANO, NOSHIRO, OYODO and destroyers.
20 October 1943:
Arrives at Brown Island, Eniwetok.
23 October 1943:
Departs Brown and sorties to a position 250 miles south of Wake. Returns after no contact is made with enemy forces.
26 October 1943:
The fleet arrives back at Truk.
3 November 1943:
Departs Truk with CruDivs 4, 7 and CruDiv 8's CHIKUMA to attack American forces off Bougainville.
5 November 1943:
Arrives at Rabaul. While at anchor, MOGAMI is attacked by an SBD dive-bomber from USS SARATOGA (CV-2) and hit by a 500-lb. bomb. She is set afire and 19 crewmen are killed.
6 November 1943:
Departs Rabaul with SUZUYA.
8 November 1943:
Arrives at Truk. Begins emergency repairs by repair ship AKASHI.
20 November 1943: American Operation "Galvanic" - The Invasion of the Gilberts:
Forces under Vice Admiral (later Admiral) Raymond A. Spruance (former CO of MISSISSIPPI, BB-41), Commander, Central Pacific, invade Tarawa and Makin Islands. The invasion fleet of 200 ships includes 13 battleships and 11 carriers.
16 December 1943:
Emergency repairs are completed. Departs Truk.
21 December 1943:
Arrives at Kure.
22 December 1943:
In drydock. Eight Type 96 single-mount 25-mm AA guns are installed on the aft deck. This brings MOGAMI's 25-mm AA suite to a total of 38 barrels.
17 February 1944:
8 March 1944:
MOGAMI departs Kure with CarDiv 1's ZUIKAKU, BatDiv 3's KONGO and HARUNA, DesDiv 10's AKIGUMO, KAZAGUMO and ASAGUMO.
11 March 1944:
At 1210, the task Force is sighted by USS LAPON (SS-260), but she is unable to attack.
14 March 1944:
ZUIKAKU and MOGAMI detach from the task force at Seletar Naval Base, Singapore. The remainder of the force continues to Lingga (S of Singapore).
15-16 March 1944:
At Singapore. Unloads army supplies.
16 March 1944:
Arrives at Lingga. Battle training.
10 April 1944:
Captain Toma Ryo assumes command.
11 May 1944:
Departs Lingga with the fleet.
14 May 1944:
Arrives at Tawi Tawi.
15 May 1944:
Departs Tawi Tawi for Tarakan, Borneo to refuel.
17 May 1944:
Arrives at Tawi Tawi. Continues battle training.
27 May 1944: American Operation "Horlicks" - The Invasion of Biak:
Rear Admiral (later Admiral/CNO) William M. Fechteler's (former CO of INDIANA, BB-58), Task Force 77 lands Maj Gen Horace H. Fuller's 41st Division on Biak off New Guinea.
12 June 1944: American Operation "Forager" - The Invasion of Saipan:
Vice Admiral (later Admiral) Richmond K. Turner's (former CO of ASTORIA, CA-34) Task Force 52 lands Marine LtGen Holland M. Smith's V Amphibious Corps and the invasion of Saipan begins.
13 June 1944: Operation "A-GO" - The Battle of the Philippine Sea:
In Tokyo, the CINC, Combined Fleet, Admiral Toyoda Soemu, (former CO of HYUGA), sends out a signal that activates the "A-Go" plan for the Defense of the Marianas.
That same day, Vice Admiral Ozawa's First Mobile Force departs Tawi Tawi to oppose the American landings on Saipan with Force "A": CarDiv 1's TAIHO (FF), ZUIKAKU and SHOKAKU, Rear Admiral Kimura Susumu's DesRon 10's light cruiser YAHAGI, DesDiv 10's TANIKAZE, URAKAZE and ISOKAZE and DesDiv 61's WAKATSUKI, HATSUZUKI, AKIZUKI and SHIMOTSUKI.
MOGAMI departs with Rear Admiral Joshima Takatsugu's (former CO of SHOKAKU) Force "B": CarDiv 2's JUNYO, HIYO and RYUHO, BatDiv 1's NAGATO, DesDiv 4's MICHISHIO, NOWAKI and YAMAGUMO, DesDiv 17's HAMAKAZE, DesDiv 27's SAMIDARE, SHIGURE, HARUSAME and AKISHIMO.
Forces A and B deploy 100 miles behind Vice Admiral Kurita's Vanguard Force "C": CarDiv 3's CHITOSE, CHIYODA, ZUIHO, BatDiv 3's HARUNA and KONGO, CruDiv 4's ATAGO, TAKAO, MAYA and CHOKAI, CruDiv 7's KUMANO, SUZUYA, CruDiv 8's TONE and CHIKUMA, DesDiv 31's ASASHIMO, KISHINAMI, DesDiv 32's TAMANAMI, FUJINAMI and HAYANAMI.
14 June 1944:
Guimaras near Panay, Philippines. The Mobile Fleet refuels from oilers GENYO and AZUSA MARUs.
15 June 1944:
The Mobile Fleet departs Guimaras through the Visayan Sea and the San Bernardino Strait into the Philippine Sea headed towards Saipan. At 1622, USS FLYING FISH (SS-229) spots the Mobile Fleet in the San Bernardino Strait. She reports the sighting that evening.
16 June 1944:
Philippine Sea. At 1650, Vice Admiral Ugaki Matome's (former CO of HYUGA) aborted "KON" group's BatDiv 1's YAMATO and MUSASHI, CruDiv 5's HAGURO and MYOKO, DesRon 2's light cruiser NOSHIRO and destroyers OKINAMI, SHIMAKAZE and ASAGUMO join the Mobile Fleet. At 2000, they are sighted by USS CAVALLA (SS-244).
18 June 1944:
At 2100, Vice Admiral Ozawa splits the Mobile Fleet. Forces A and B proceeds southward. The Vanguard Force C proceeds due east.
19 June 1944:
At 0530, the third morning reconnaissance group takes off. Two floatplanes from MOGAMI are launched. CarDiv 1's SHOKAKU launches eleven Yokosuka D4Y2-C Suisei ("Judy") dive-bombers on reconnaissance duty.
Later in the day, the Mobile Fleet's aircraft attack Task Force 58 off Saipan, but suffer overwhelming losses in the "Great Mariana's Turkey Shoot".
20 June 1944:
About 2030, two hours after she is hit by torpedoes by Grumman TBM "Avenger" torpedo planes from USS BELLEAU WOOD (CVL-24), carrier HIYO explodes and sinks. MOGAMI and NAGATO stand by as destroyers rescue most of HIYO's crew. That night, MOGAMI retires with the Mobile Fleet to Nakagusuku Bay, Okinawa.
22 June 1944:
At 1300, the Mobile Fleet arrives at Okinawa, refuels destroyers and departs.
24 June 1944:
The Mobile Fleet arrives at Hashirajima.
25 June 1944:
At Kure for refit. Four triple-mount and 10 single-mount Type 96 25-mm AA guns are installed. This brings MOGAMI's AA suite to a total of 60 barrels (14x3 and 18x1). A Type 22 surface search radar and a Type 13 air-search radar are fitted. She is also fitted with a Type 2 infrared Identification Friend-or-Foe signaling device.
8 July 1944:
MOGAMI departs Kure carrying Imperial Army troops and material with Group "B": battleships KONGO and NAGATO, DesRon 10: light cruiser YAHAGI with DesDiv 17's URAKAZE, ISOKAZE, HAMAKAZE and YUKIKAZE and Group "A": BatDiv 1's YAMATO and MUSASHI, CruDiv 4's ATAGO, TAKAO, MAYA and CHOKAI, CruDiv 7's KUMANO, SUZUYA, TONE and CHIKUMA, DesRon 2's light cruiser NOSHIRO and destroyer SHIMAKAZE with DesDiv 2's AKISHIMO and HAYASHIMO, DesDiv 31's KISHINAMI, OKINAMI and ASASHIMO, DesDiv 32's FUJINAMI and HAMANAMI, DesDiv 17's HAMAKAZE, DesDiv 27's SHIGURE and SAMIDARE.
10 July 1944:
Arrives at Nakagusuku, Okinawa.
12 July 1944:
Group B departs Okinawa.
14 July 1944:
Arrives at Manila.
17 July 1944:
19 July 1944:
Arrives at Singapore, then to Lingga (S of Singapore).
20 July-18 October 1944:
Training with the fleet at Lingga.
18 October 1944:
MOGAMI departs Lingga with Kurita's First Raiding Force in Vice Admiral Nishimura Shoji's (former CO of HARUNA) Force "C" (Southern Force): BatDiv 2's FUSO and YAMASHIRO, DesDiv 4's ASAGUMO, MICHISHIO and YAMAGUMO and DesDiv 27's SHIGURE.
20 October 1944:
Arrives at Brunei Bay, Borneo. Admiral Kurita orders most of his force's floatplanes flown off to bases bases at Mindoro, Philippines as a fire precaution for his ships.
22 October 1944: Operation "SHO-I-GO"(Victory) - The Battle of Leyte Gulf:
Force C departs Brunei.
24 October 1944:
In the morning when Vice Admiral Nishimura arrives at the entrance of the Mindanao Sea, he launches MOGAMI's floatplane, probably an Aichi E13A1 Type O ("Jake") three-seat floatplane to reconnoiter Leyte Gulf. At 0650, this scout reaches the gulf and radios sighting four battleships and two cruisers S of the bay. The plane also reports about 80 transports off the landing area and four destroyers and several torpedo boats near Surigao Strait. In addition, the scout reports 12 carriers and 10 destroyers 40 miles SE of Leyte. This is the first intel report received that day by any Japanese forces concerning the situation at Leyte Gulf.
Between 0918-1000, Force C is attacked in the Sulu Sea by 26 aircraft from Task Group 38. 4's USS ENTERPRISE (CV-6) and FRANKLIN (CV-13). A fire is started in FUSO's aviation gasoline tanks located under the quarterdeck near the catapult that destroys her "Pete" floatplanes. MOGAMI is damaged slightly by strafing and rockets.
25 October 1944: The Battle of the Surigao Strait:
Between 0300-0330, Force C is attacked by American Desrons 24, 54 and 56. Battleships FUSO and YAMASHIRO are hit by torpedoes and destroyers YAMAGUMO sunk and MICHISHIO disabled, but MOGAMI is not hit.
At about 0345, FUSO sinks by the bow.
Between 0350-0402, after entering the Surigao Strait, MOGAMI is struck by four 8-inch shells and fires start. The shells destroy both the bridge and the air defense center. MOGAMI's skipper Captain Toma and his Executive Officer, Captain Hashimoto Uroku, are killed on the bridge. The Chief Gunnery Officer, LtCdr Arai Giichiro takes command.
At 0419, YAMASHIRO, capsizes and sinks.
At 0429, Vice Admiral Shima Kiyohide's (former CO of OI) northbound flagship NACHI collides with MOGAMI that is retiring southward. NACHI's bow is rent portside and as she pulls clear, she begins to flood. MOGAMI is holed starboard side above the waterline. Fires ignite five torpedoes that explode and disable her starboard engine.
Between 0530-0535, MOGAMI is hit by ten to twenty 6-inch and 8-inch shells from USS PORTLAND (CA-33), LOUISVILLE (CA-28) and DENVER (CL-58). At 0550, MOGAMI is attacked unsuccessfully by PT-491 that misses her with two torpedoes. Destroyer AKEBONO is dispatched to escort her to Coron.
At 0830, MOGAMI's port engine breaks down. At 0902, while adrift, she is attacked by 17 TBM-1 Grumman "Avenger" torpedo-bombers from Task Group 77. 4. 1 and hit by two 500-lb. bombs.
At 1047, MOGAMI is abandoned. At 1240, AKEBONO scuttles her with a single Type 93 "Long Lance" torpedo. At 1307, MOGAMI sinks at 9-40 N, 124-50 E. One hundred ninety-two crewmembers go down with her. AKEBONO rescues 700 survivors from MOGAMI.
Captain Toma is promoted Rear Admiral, posthumously. His Executive Officer, Captain Hashimoto Uroku, (former Chief Gunnery Officer of CHOKAI) is also promoted Rear Admiral, posthumously.
20 December 1944:
Between 0015-0035, Force C is attacked unsuccessfully by PT-146, PT-151 and PT-190 missing with two torpedoes. Then between 0205-0215, Force C is attacked unsuccessfully by other PT boats.
Removed from the Navy List.
 Mt. Niitaka, located in Formosa (now Taiwan), was the highest point in the Japanese Empire at the time.
 Information on DARDANUS was provided by Roy Warwick, a survivor of her sinking.
Special thanks for assistance in researching the IJN officers mentioned in this TROM go to Mr. Jean-François Masson of Canada. Thanks also go to "Adm. Gurita" of the Netherlands, Andrew Obluski of Poland and Randy Stone of the United States.
For further reading, see Anthony P. Tully's "Battle of Surigao Strait" published by Indiana University Press in 2009.
Thanks also go to Rob Stuart of Canada for additional info about "Operation C". For more info on "Operation C" please see Rob's splendid 20 Ships, Not 23: Ozawa’s Score, 5-6 April 1942.
- Bob Hackett and Sander Kingsepp.