(AOBA by Ueda Kihachiro)
Tabular Record of Movement
© 1997-2010 Bob Hackett and Sander Kingsepp
20 September 1927:
Nagasaki. AOBA is completed at Mitsubishi's shipyard and registered in the IJN.
Attached to CruDiv 5 with KINUGASA (F).
20 May 1933:
Transfers to CruDiv 6.
15 November 1935 - 30 November 1936:
Attached to CruDiv 7 with KINUGASA.
1 December 1936:
Placed in Reserve during reconstruction. The ship was to have been given a major modernization, but this was prevented by the Sino-Japanese War. AOBA receives only a limited refit. No complete change of boilers takes place. Only the two mixed-firing boilers are altered to oil firing.
During this reconstruction, six single 20-cm. (7.9-inch) main gun turrets are replaced by three Nendo Shiki of 20.3cm (8 inch) twin turrets, and the fire control system is modified. No change is made to the 4.7in guns except for their control, but the light AA is improved by the addition of four twin 25mm around the aft funnel, while the quad 13.2mm are supplanted by a pair of twin 13.2mm MGs at the fore end of the bridge. Two quadruple banks of 24in tubes and reloads are installed.
The catapult is replaced by one of heavier pattern and two E7K2 "Alf" floatplanes are embarked. The alterations
result in a 576 ton increase in weight so bulges are fitted to restore stability, increasing the beam by about 5.5 feet.
1 September 1937:
Sasebo Navy Yard. Reconstruction is completed.
15 November 1940:
AOBA returns to service with CruDiv 6.
25 July 1941:
Captain (later Rear Admiral) Hisamune Sojiro (former CO of SENDAI) assumes command.
30 November 1941:
AOBA departs Kure for the Bonin Islands in Vice Admiral (later Admiral) Takasu Shiro's (former CO of ISUZU) First Fleet as the flagship of Rear Admiral Goto Aritomo's (former CO of MUTSU) CruDiv 6 with KINUGASA, KAKO and FURUTAKA to prepare for hostilities.
2 December 1941:
Hahajima, Bonin Islands. CruDiv 6 receives the signal "Niitakayama nobore (Climb Mt. Niitaka) 1208" from the Combined Fleet's flagship NAGATO. The signal signifies that X-Day hostilities will commence on 8 December (Japan time). 
4 December 1941:
CruDiv 6 departs Hahajima in support of the invasion of Guam.
8 December 1941: The Invasion of Wake Island:
Rear Admiral (Vice Admiral, posthumously) Kajioka Sadamichi's (former CO of NAGARA) DesRon 6's light cruiser YUBARI, eight destroyers, two transports and three submarines assault Wake Island. The United States Marines beat back the first attack. Kajioka loses LtCdr Takatsuka Minoru's destroyer HAYATE to Lt John A. McAlister's 5-inch Battery "L" on Wilkes Island and LtCdr Ogawa Yoichiro's destroyer KISARAGI to Marine Grumman F4F-3 "Wildcats" of VMF-211.
10 December 1941: The Invasion of Guam:
The Invasion Force lands 5,500 troops of MajGen Horii Tomitara's South Seas Detachment. CruDiv 6 departs for Truk arriving that same day.
12 December 1941:
CarDiv 2's HIRYU and SORYU are detached from Vice Admiral (Admiral, posthumously) Nagumo Chuichi's Carrier Striking Force that is returning from Pearl Harbor to reinforce Kajioka. Rear Admiral (later Vice Admiral) Abe Hiroaki's (former CO of FUSO) CruDiv 8's TONE and CHIKUMA and two destroyers are also detached. Kajioka is further reinforced by seaplane tender KIYOKAWA MARU and two other destroyers. Rear Admiral Abe, as senior officer present, has overall command.
CruDiv 6 departs Truk for Wake.
23 December 1941- The Second Attack on Wake Island:
After a magnificent stand, Wake's small garrison is overwhelmed and forced to surrender.
10 January 1942:
CruDiv 6 arrives at Truk.
18 January 1942:
CruDiv 6 departs Truk.
21 January 1942: Operation "O"- The Invasion of Rabaul and Kavieng:
Carrier SHOKAKU launches strikes against Lae, New Guinea. A Mitsubishi A6M Zeke from SHOKAKU intercepts and shoots down
an Australian "Catalina" PBY patrol plane. Four RAAF crewmen make it into rafts. After several hours they are picked up by AOBA.
23 January: Operation "O"- The Invasion of Rabaul and Kavieng:
60 miles NW of Rabaul. CruDiv 6 takes up position to cover the invasion landings.
24 January 1942:
AOBA is refueled at sea by naval fleet tanker IRO.
26 January 1942:
at 1300, AOBA arrives at Rabaul. The four RAAF prisoners are disembarked in custody of Rabaul's 8th Special Base Force. At 1600, AOBA departs. 
30 January 1942:
At 0800, CruDiv 6 arrives at Rabaul. Refuels from IRO. and sent the four prisoners ashore to the 8th Special Base Force headquarters. At 1700, departs Rabaul.
1 February 1942:
4 February 1942:
CruDiv 6 arrives at Roi.
6 February 1942:
CruDiv 6 arrives at Kwajalein.
10 February 1942:
CruDiv 6 arrives at Truk.
20 February 1942:
Vice Admiral Wilson Brown Jr's (later President Roosevelt's Naval Aide) Task Force 11's USS LEXINGTON (CV-2) is en route to attack Rabaul. The task force is spotted by a Kawanishi H6K Mavis flying boat of the Yokohama Kokutai. Since surprise is lost, the American attack is cancelled. Task Force 11 is attacked off Bougainville by the 4th Kokutai's naval land-based bombers, but the Japanese are beaten off with heavy losses.
2 March 1942:
CruDiv 6 departs Truk.
5 March 1942:
CruDiv 6 arrives at Rabaul.
That same day, CruDiv 18's TENRYU and TATSUTA and KIYOKAWA MARU depart with CruDiv 6's AOBA, FURUTAKA, KINUGASA and KAKO, minelayers OKINOSHIMA and TSUGARU, DesRon 6's YUBARI and destroyers MUTSUKI, YAYOI, MOCHIZUKI, OITE, ASANAGI and YUNAGI.
8 March 1942:
Provides cover for invasions of Lae and Salamaua. Departs the area.
9 March 1942:
CruDiv 6 and CruDiv 18 arrive at Buka, Bougainville.
11 March 1942:
CruDiv 6 and CruDiv 18 arrive at Rabaul.
14 March 1942:
CruDiv 6 and CruDiv 18 depart Rabaul.
15 March 1942:
CruDiv 6 and CruDiv 18 arrive at Buka.
17 March 1942:
CruDiv 6 and CruDiv 18 depart Buka.
18 March 1942:
CruDiv 6 and CruDiv 18 arrive at the Moewe Passage, near Kavieng, New Ireland.
26 March 1942:
CruDiv 6 and CruDiv 18 depart Moewe Passage.
27 March 1942:
CruDiv 6 and CruDiv 18 arrive at Rabaul.
28 March 1942:
CruDiv 6 and CruDiv 18 depart Rabaul.
30 March 1942:
CruDiv 6 and CruDiv 18 cover the invasion landings at Shortland.
31 March 1942:
CruDiv 6 and CruDiv 18 cover the invasion landings at Kieta, Bougainville.
1 April 1942:
CruDiv 6 and CruDiv 18 arrive at Rabaul. Refuel and depart that same day.
2 April 1942:
CruDiv 6 and CruDiv 18 arrive at the Moewe Passage.
5 April 1942:
CruDiv 6 and CruDiv 18 depart the Moewe Passage.
7 April 1942:
CruDiv 6 arrives at Manus, Admirality Islands.
8 April 1942:
CruDiv 6 and CruDiv 18 departs Manus.
10 April 1942:
CruDiv 6 and CruDiv 18 arrives at Truk.
30 April 1942: Operation "MO" - The Invasions of Tulagi and Port Moresby, New Guinea:
CruDiv 6 and carrier SHOHO sortie from Truk in Vice Admiral (later Admiral) Inoue Shigeyoshi's (former CO of HIEI) Fourth Fleet's Main Body Support Force.
3 May 1942:
CruDiv 6 arrives at the Queen Carola anchorage near Buka and provides distant cover for the landings at Tulagi.
4 May 1942:
Rabaul, New Britain. Rear Admiral Kajioka's Port Moresby Attack Force departs with DesRon 6's light cruiser YUBARI, four destroyers and a patrol boat escorting Rear Admiral (later Vice Admiral) Abe Koso's (former CO of HIEI) Transport Force of 12 transports, 3 oilers, minelayer TSUGARU and 3 mine-sweepers towards the Jomard Pass in the Louisiade Archipelago.
Tulagi, Solomons. That same day, Rear Admiral (later Admiral) Frank Jack Fletcher's (former CO of VERMONT, BB-20) Task Force 17's USS YORKTOWN (CV-5) launches three strikes, comprising 99 planes, at Rear Admiral (later Vice Admiral) Shima Kiyohide's (former CO of OI) Tulagi Invasion Force. YORKTOWN's TBD torpedo planes and SBD dive-bombers sink destroyer KIKUZUKI and three minesweepers and damage four other ships.
Queen Carola. CruDiv 6 departs towards Guadalcanal in response to reports of YORKTOWN's raids on Tulagi.
5 May 1942:
Fletcher's force turns to engage Vice Admiral (Admiral, posthumously) Takagi Takeo's (former CO of MUTSU) Carrier Strike Force: Rear Admiral (later Vice Admiral) Hara Chuichi's (former CO of TATSUTA) CarDiv 5's SHOKAKU and ZUIKAKU, Takagi's CruDiv 5's MYOKO and HAGURO, six destroyers and an oiler.
CruDiv 6 arrives at the Shortland anchorage that day and refuels from oiler IRO.
6 May 1942:
Shortland. CruDiv 6 is attacked unsuccessfully by four USAAF Boeing B-17 "Flying Fortresses".
7 May 1942:The Battle of the Coral Sea:
CruDiv 6 departs Shortland and effects a rendezvous at sea with light carrier SHOHO.
Rear Admiral Hara's SHOKAKU and ZUIKAKU launch a 78-plane strike against a reported American carrier and cruiser sighted to the south. An hour later, another report advises that an American carrier and about ten other ships were sighted 280 miles NW. CarDiv 5's planes do not find "a carrier and cruiser", but find two other American ships. They damage oiler USS NEOSHO (AO-23) and sink her escort, destroyer SIMS (DD-409).
N of Tagula Island. At 1100, SHOHO is attacked by 93 SBD dive-bombers and TBD torpedo-bombers from Fletcher's YORKTOWN and Rear Admiral (later Admiral) Aubrey W. Fitch's (former CO of LEXINGTON, CV-2) Task Force 11's LEXINGTON. CruDiv 6 stands too far off from SHOHO to provide effective AA support. SHOHO is sunk off Misima Island.
8 May 1942:
Forty-six SBDs, 21 TBDs and 15 Grumman F4F "Wildcats" from YORKTOWN and LEXINGTON find Hara's CarDiv 5. They damage SHOKAKU severely above the waterline and force her retirement. ZUIKAKU's air group also suffers heavy losses.
Thirty-six of CarDiv 5's Type 97 Nakajima B5N2 Kate attack planes with 24 Type 99 Aichi D3A1 Val dive-bombers covered by 36 Type 0 Mitsubishi A6M Zeke fighters damage YORKTOWN and LEXINGTON. LEXINGTON, hit by torpedoes and several bombs, is further damaged when gasoline vapors ignite and trigger massive explosions that cause her to be abandoned. Later she is scuttled by destroyer PHELPS (DD-360).
AOBA and KAKO cover the withdrawing Port Moresby invasion convoy. FURUTAKA and KINUGASA detach from CruDiv 6 to escort SHOKAKU back to Truk.
9 May 1942:
Refuels at Shortland.
10 May 1942:
The Battle of the Coral Sea halts the Japanese thrust toward Port Moresby and they cancel Operation MO.
11 May 1942:
Departs Shortland with KAKO for the Queen Carola Harbor, Buka.
14 May 1942:
AOBA departs Buka with KAKO.
16 May 1942:
Arrives at Truk.
17 May 1942:
Departs Truk with KAKO.
22 May 1942:
Arrives at Kure. Refit with KAKO.
25 May 1942:
29 May 1942:
16 June 1942:
Departs Kure with KAKO. They join CruDiv 18's TENRYU and TATSUTA for training in the Bungo Suido.
23 June 1942:
Arrives at Truk.
30 June 1942:
Departs Truk with KAKO.
5 July 1942:
Arrives at Kieta, Bougainville.
7 August 1942: American Operation "Watchtower" - The Invasion of Guadalcanal, Solomons:
Rear Admiral (later Admiral) Richmond K. Turner's (former CO of ASTORIA, CA-34) Amphibious Task Force 62, covered by Vice Admiral (MOH '14/later Admiral) Frank J. Fletcher's (former CO of VERMONT, BB-20) Task Force 61 and Rear Admiral (later Admiral) John S. McCain's (former CO of RANGER, CV-4) Task Force 63's land-based aircraft, lands Maj Gen (later General/MOH/Commandant) Alexander A. Vandegrift's 1st Marine Division on Florida, Tulagi, Gavutu, Tanambogo and Guadalcanal opening the campaign to take the island.
That same day, CruDiv 6 and CHOKAI depart the Moewe Passage through the "Slot" towards Guadalcanal with light cruisers TENRYU and YUBARI and destroyer YUNAGI. At Rabaul, CHOKAI embarks the Commander of the Eighth Fleet, Vice Admiral Mikawa Gunichi (former CO of KIRISHIMA) and his staff.
8 August 1942:
At 0625, each of Mikawa's five cruisers catapult a floatplane. Three fly to search waters N of the Solomons. AOBA's floatplane, probably an E13A1 Jake, flies S to the landing area and reconnoiters Tulagi. Avoiding fighters and flak, the crew returns at noon and reports "one battleship, one auxiliary carrier, four cruisers, seven destroyers and 15 transports" off Lunga Point. Mikawa now knows that the Allied force is divided and that he can deal with them separately.
9 August 1942: The Battle of Savo Island.
Rear Admiral (VC-'18/later Admiral Sir) Victor A. Crutchley's, RN (former CO of HMS WARSPITE), Task Group 62.6 of cruisers and destroyers is screening the invasion transports at Savo Island off Guadalcanal. Crutchley is ordered to detach to Guadalcanal with his flagship, cruiser AUSTRALIA, to attend a meeting with ComTaskFor 62 Rear Admiral (later Admiral) Richmond K. Turner (former CO of ASTORIA, CA-34).
CruDiv 6, CHOKAI, the light cruisers TENRYU and YUBARI and destroyer YUNAGI prepare to engage the Allied Forces in a night gun and torpedo action. At 2312, CHOKAI, FURUTAKA and KAKO each launch a spotter floatplane. They soon report three cruisers S of Savo. The circling planes then drop flares to illuminate the targets and all the Japanese ships open fire. ASTORIA, QUINCY (CA-39), VINCENNES (CA-44) and Australian HMAS CANBERRA are sunk. CHICAGO, RALPH TALBOT (DD-390) and PATTERSON (DD-392) are damaged. On the Japanese side, AOBA is hit once, KINUGASA twice and CHOKAI is hit three times. AOBA and KAKO's floatplanes and crews are also lost.
The heavily-laden American invasion transports off Guadalcanal are unprotected and in harm's way, but Admiral Mikawa is unaware that Admiral Fletcher has withdrawn his carriers covering the invasion. Mikawa fears an air attack at daybreak and orders a retirement. Admiral Turner's transports are left untouched.
10 August 1942:
CruDiv 6 retires towards Kavieng. On the way, LtCdr John R. Moore's old S-44 torpedoes and sinks KAKO. AOBA and the remainder of CruDiv 6 arrive at Moewe Passage, Kavieng for emergency repairs and refit.
17 August 1942:
CruDiv 6 departs the Moewe Passage.
19 August 1942:
CruDiv 6 arrives at the seaplane base at Rekata Bay, San Ysabel.
20 August 1942:
CruDiv 6 departs Rekata Bay.
22 August 1942:
CruDiv 6 arrives at Shortland.
23 August 1942:
CruDiv 6 and CHOKAI depart Shortland to provide distant cover for the Guadalcanal reinforcement convoys.
25 August 1942:
During the night, floatplanes from AOBA, CHOKAI, KINUGASA, FURUTAKA and YURA bomb the Lunga point area of Guadalcanal.
26 August 1942:
AOBA arrives at Kieta. She remains there in readiness for the next month, except to refuel and reprovision at Rabaul.
27 August 1942:
At 1600, AOBA and FURUTAKA arrive at Shortland. Rear Admiral Goto confers with ComDesRon 2, Rear Admiral (later Vice Admiral) Tanaka Raizo (former CO of KONGO).
28 August 1942:
An AOBA floatplane reports two transports, a cruiser and two destroyers in Tulagi Harbor. Despite this message and an earlier victory of Guadalcanal-based SBD's over DesDiv 20, the IJN sends another reinforcement convoy to disembark at Lunga.
1 October 1942:
CruDiv 6 reunites at Shortland.
11 October 1942: The Battle of Cape Esperance:
Rear Admiral Goto's CruDiv 6's AOBA (F), FURUTAKA and KINUGASA and DesDiv 11's FUBUKI and HATSUYUKI depart Shortland towards Guadalcanal. Goto's mission is to provide cover for a troop reinforcement convoy by shelling Henderson Field.
Rear Admiral Joshima Takatsugu's (former CO of SHOKAKU) convoy of seaplane carriers CHITOSE and NISSHIN and six destroyers, reaches Tassafaronga, Guadalcanal and lands the IJA's 2nd Infantry Division, tanks and artillery.
A report is received that a B-17 of the 11th Bomb Group (H) has sighted a Japanese force approaching Guadalcanal. ComTaskFor 64's Rear Admiral (MOH posthumously) Norman Scott (former CO of PENSACOLA, CA-24) who just completed escorting 6,000 troops of the Army's "Americal" Division from New Caledonia to Guadalcanal, launches two Curtiss SOC "Seagull" reconnaissance planes. They spot and report Goto's force coming down the "Slot" at 30 knots. So alerted, Scott's radar-equipped Task Force 64's SAN FRANSCISCO (CA-38) (F), SALT LAKE CITY (CA-25), light cruisers BOISE (CL-47), HELENA (CL-50) and five destroyers steam around the end of Guadalcanal to block the entrance to Savo Sound.
At 2235, Rear Admiral Goto's three cruisers and two destroyers are picked up by Captain Gilbert C. Hoover's HELENA's radar. Scott reverses course and crosses the Japanese "T". Both fleets open fire.
ComCruDiv 6, Rear Admiral Goto, thinking he is under "friendly-fire", orders a 180-degree turn that exposes each of his ships to the Americans' broadsides. Flagship AOBA is hit by up to forty 6-inch and 8-inch shells and damaged heavily. The bridge is wrecked, the No. 2 8-inch (203.2-mm) turret is knocked out and the No. 3 turret is destroyed. Other hits put four of AOBA's boilers off line. Admiral Goto is mortally wounded and 80 other crewmen are killed.
AOBA is crippled, FURUTAKA and destroyer FUBUKI sunk and HATSUYUKI is damaged.
BOISE, SALT LAKE CITY and FARENHOLT (DD-491) are damaged.
12 October 1942:
Rear Admiral Goto dies aboard AOBA. He is promoted Vice Admiral, posthumously. AOBA and KINUGASA return to Shortland that day.
13 October 1942:
After temporary repairs, departs Shortland.
15 October 1942:
Arrives at Truk. The CINC, Combined Fleet, Admiral Yamamoto Isoroku inspects the AOBA's damage.
17 October 1942:
Refuels from oiler NISSHO MARU then departs for Kure.
22 October 1942:
Arrives at Kure. Battle damage repairs and refit.
10 November 1942:
Kure. Captain Hisamune is relieved by Captain (later Rear Admiral) Araki Tsutau (former CO of FURUTAKA) who assumes command of AOBA "on paper". Captain Hisamune is reassigned as the CO of battleship NAGATO.
AOBA's wrecked No. 3 turret is removed, covered over with steel plates and a Type 96 triple-mount 25-mm. AA gun is installed over the plates.
31 December 1942:
Captain (Rear Admiral, posthumously) Tawara Yoshioki (former CO of NAGARA) assumes command.
15 February 1943:
Repairs are completed. Departs Kure.
20 February 1943:
Arrives at Truk.
24 February 1943:
Truk. Captain (later Rear Admiral) Yamamori Kamenosuke (former CO of YAKUMO) assumes command. Captain Tawara is later reassigned as CO of light cruiser NOSHIRO.
28 February 1943:
2 March 1943:
Arrives at Rabaul.
3 March 1943:
4 March 1943:
Arrives at the Moewe anchorage, Kavieng, New Ireland.
3 April 1943:
Moewe anchorage. Boeing B-17 "Flying Fortresses" of the Fifth Air Force's 43rd Bomb Group attack moored AOBA. The big bombers skip-bomb from between 75 and 250 feet with delayed-action fused 500-lb. bombs. A direct hit on AOBA explodes two Type 93 "Long Lance" torpedoes stored aboard and sets the ship afire while the B-17's .50-cal. machine guns strafe her decks. HATSUZUKI assists in fire-fighting. AOBA is flooded and has to be beached to avoid sinking. Destroyer FUMIZUKI is also damaged lightly by a near-miss. The Americans suffer no losses and the 43rd claims two 'probable cruisers' sunk.
3-20 April 1943:
Emergency repairs are performed by repair ship YAMABIKO MARU.
21 April 1943:
AOBA is towed to Truk by light cruiser SENDAI escorted by two destroyers.
25 April 1943:
Arrives at Truk. Repair ship AKASHI accomplishes further repairs over the next three months.
25 July 1943:
Departs Truk for Kure.
1 August 1943:
Arrives at Kure. Battle damage repairs and refit. AOBA's No. 3 8-inch turret is repaired and reinstalled replacing the triple-mount 25-mm. AA gun fitted in November-December. A Type 21 air-search radar and two Type 96 twin-mount 25-mm. AA guns are installed. AOBA's maximum speed is reduced to 25 knots due to partially irrepairable engine damage.
24 November 1943:
Repairs and refit are completed.
25 November 1943:
Kure. Reassigned to the First Southern Expeditionary Fleet.
15 December 1943:
20 December 1943:
Arrives at Manila.
21 December 1943:
24 December 1943:
Arrives at Singapore.
3 January 1944:
Departs Singapore with cruiser ASHIGARA, light cruiser KUMA and destroyer URANAMI.
4 January 1944:
Arrives at Penang, Malaya.
5 January 1944:
Embarks Army troops and supplies and departs.
6 January 1944:
Arrives at Mergui, Burma.
7 January 1944:
8 January 1944:
KUMA and URANAMI detach to Penang.
9 January 1944:
AOBA and ASHIGARA arrive at Singapore.
11 January 1944:
Refit at Singapore.
23 January 1944:
Departs Singapore. AOBA, accompanied by light cruisers OI, KITAKAMI and KINU, escorted by destroyer SHIKINAMI makes a troop transport run to the Andaman Islands.
25 January 1944:
Andaman Sea. Arrive at Port Blair. Disembarks troops.
27 January 1944:
Malacca Strait. SW of Penang at 04-54N, 98-28E. On the return leg to Singapore, KITAKAMI is hit aft by two torpedoes fired by Royal Navy Lt D. J. B. Beckley's submarine HMS TEMPLAR based at Trincomalee, Ceylon. KINU takes KITAKAMI under tow escorted by SHIKINAMI. AOBA and OI continue to Singapore.
12 February 1944:
Departs Singapore for training at Lingga.
22 February 1944:
Returns to Singapore.
25 February 1944:
Attached to CruDiv 16 as Rear Admiral (later Vice Admiral) Sakonjo Naomaso's (former CO of SETTSU) flagship with light cruiser KINU.
27 February 1944:
Departs Lingga with CruDiv 7's TONE and CHIKUMA and destroyer URANAMI.
1 March 1944: Operation "SA No. 1" - The 1944 Indian Ocean Raids:
Arrives at Bangka. Departs that day for the Indian Ocean for commerce raiding.
9 March 1944:
TONE sinks British SS BEHAR and takes aboard 108 captives of whom four die.
15 March 1944:
Arrives at Batavia, Java. TONE disembarks 32 other POWs.
18 March 1944:
Departs Batavia. While enroute to Singapore, Rear Admiral Sakonjo complies with the Imperial "disposal" policy concerning POWs. He orders the beheading of each of the remaining 72 captives aboard TONE. 
25 March 1944:
Arrives at Singapore.
2 April 1944:
AOBA departs Singapore carrying ammunition with light cruisers OI and KINU, destroyer AMAGIRI and two unidentified destroyers.
4 April 1944:
At 1900, the AOBA group arrives at Balikpapan, Borneo. Refuels and takes on fresh provisions.
5 April 1944:
9 April 1944:
Arrives at Tarakan.
10 April 1944:
11 April 1944:
Arrives at Balikpapan.
14 April 1944:
Arrives at Singapore.
15 April 1944:
Departs Singapore with OI and AMAGIRI carrying torpedoes for SubRon 8 at Penang.
18 April 1944:
Departs Penang with OI and AMAGIRI. The two cruisers carry personnel of the 732nd. Air Group and base materials.
19 April 1944:
Arrives at Singapore and departs that the same day. The cruisers carry 851st Air Group personnel and base materials for Davao.
22 April 1944:
AOBA, OI and AMAGIRI proceed up Makassar Strait at 24 knots in calm weather.
23 April 1944:
Makassar Strait. 55 miles S of Balikpapan. Late in the morning, AMAGIRI, paralleling OI, about 600 metres off her starboard side, is suddenly shaken by a terrific explosion to the rear of the bridge under her keel. AMAGIRI hit a magnetic mine laid earlier by an enemy plane. Her sound-room rapidly fills with fuel oil from a ruptured tank. Luckily, the crewmen manage to escape through the blown hatch chased by the rising tide of oil. Many men in the boiler and engine rooms suffer burns. On the bridge, it is believed the ship was torpedoed, so extra lookouts are posted. AMAGIRI takes on a 19 degree list to starboard. Fires break out. The No. 1 boiler room is abandoned. The torpedoes in No. 1 mount are jettisoned to prevent induced explosions. Some progress is made in combating the flames, but the list continues to increase.
AOBA orders AMAGIRI to make for Surabaya, but i is impossible for the destroyer to make headway. AMAGIRI starts to lose trim forward. Oil spills into the sea and catches fire. Finally, AMAGIRI's captain orders the IJN flag on her rear mast lowered. Boats are lowered, but catch fire in the burning oil. AMAGIRI's shafts and propellers rise from the water. All hands exit over the high side as AMAGIRI's stern rises in the air. The survivors are picked-up by AOBA and OI . 13 of AMAGIRI’s crew are lost.
24 April 1944:
Arrives at Tarakan. Disembarks AMAGIRI's suvivors.
27 April 1944:
Departs Tarakan. Arrives at Davao. Unloads supplies.
28 April 1944:
Departs Davao for Tarakan.
29 April 1944:
Arrives at Tarakan.
14 May 1944:
Departs Tarakan on a transport run with the OI and destroyer SHIKINAMI.
17 May 1944:
Arrives at Palau.
19 May 1944:
Departs Palau on a transport run with OI and SHIKINAMI to Sorong.
22 May 1944:
Arrives back at Palau.
23 May 1944:
Departs Palau with OI and SHIKINAMI on a transport run to Sorong, then via Batjan for Tarakan.
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.
That same day, AOBA arrives at Tarakan. Refuels.
30 May 1944:
31 May 1944: Operation "KON" - The Reinforcement of Biak:
Arrives at Zamboanga, Mindanao, Philippines to cover the Biak troop reinforcement convoy. Departs for Davao.
1 June 1944:
Arrives at Davao with light cruiser KINU and destroyer SHIKINAMI.
2 June 1944:
Departs Davao for Biak with transport units and escorts. After being sighted by two B-24 bombers, the operation is canceled.
4 June 1944:
Arrives at Waparim Bay, Waigeo Island, then departs escorted by destroyer SHIGURE. That same day, arrives at Sorong. Disembarks troops.
That same day Captain Yamazumi Chusaboru (former CO of KASHIMA) assumes command. Captain Yamamori is reassigned to the Iwakuni Navy Base.
5 June 1944:
Departs Sorong with KINU for Kabui Bay, Misool Island area. Rear Admiral Sakonjo transfers his ComCruDiv 16 flag to SHIKINAMI. A troop transport run to Biak is aborted due to enemy interception. SHIKINAMI suffers minor damage in air attacks due to strafing.
6 June 1944:
Anchored off Weigo Island. AOBA is attacked unsuccessfully by eleven Fifth Air Force B-24 bombers. Departs Kabui Bay.
AOBA's Action Report reads:"While this ship was anchored at readiness condition and standing by alone at Kabui Bay at 1705, five B-24’s attacked on the bow and six B-24’s from 30 degrees to port. AA action; 1712: Opened up with H.A. guns on formation of six B-24’s; 1713: Enemy aircraft dropped bombs but no damage; 1714: Opened up with main battery on formation of five B-24’s; 1716: formation dropped bombs but no damage. 1727: Got underway and headed for bay entrance. While carrying evasive manoeuvres, returned enemy fire with main battery and H.A. guns; 1805: Enemy aircraft lost from sight at a range of 35,000 metres on the bow. Ammunition expended: Main battery 97 rounds, H.A. guns 126 rounds.
7 June 1944:
AOBA and KINU rendezvous with DesDiv 19 and DesDiv 27 N of Misool Island. Depart Misool that day.
8-9 June 1944:
At Ambon for refueling, then to Salawati Island, Vogelkop.
10 June 1944:
Rear Admiral Sakonjo transfers his flag back to AOBA.
11 June 1944:
Arrives at Batjan.
14 June 1944:
Departs Batjan. Arrives at Obi Major Island, Celebes.
17 June 1944:
Departs Obi Major Island.
18 June 1944:
Arrives at Bangka Roads.
25 June 1944:
Departs Bangka Roads.
27 June 1944:
Arrives at Makassar.
28 June 1944:
Departs Makassar to Singapore.
2 July 1944:
Arrives at Singapore. Refit.
4 July 1944:
Drydocked. Four triple-mount and 15 single-mount Type 96 25-mm AA guns are installed. A Type 22 surface-search radar is fitted.
15 July 1944:
24 July 1944:
Departs Singapore. Arrives at Lingga. Thereafter, trains with the fleet.
11 October 1944:
Collides with light cruiser KINU. Slightly damaged.
18 October 1944:
Departs Lingga for Brunei with CruDiv 16's KINU and Vice Admiral Kurita Takeo's (former CO of KONGO) First Raiding Force.
20 October 1944:
Arrives at Brunei.
21 October 1944:
Detached from the First Raiding Force. Departs Brunei for Manila with CruDiv 16's KINU and destroyer URANAMI.
23 October 1944:
AOBA is attacked by Cdr W. G. Chapple's USS BREAM (SS-243). At 0430, one of the six torpedoes Chapple fires hits AOBA in her No. 2 engine room. She takes on a 13 degree list to starboard.
At 0815, AOBA is towed by KITAGAMI to the Cavite Navy Yard near Manila.
At 1422, USN codebreakers intercept and decrypt a message that reads: “AOBA was torpedoed by an enemy submarine and taken in tow by the KITAGAMI. 0900 posit. Was ---- from Cabra Island----"
24 October 1944:
Cavite. While undergoing emergency repairs, AOBA is attacked by Vice Admiral (later Admiral) Marc A. Mitscher's Task Force 38's carrier-based aircraft .
29 October 1944:
Cavite. Attacked again by carrier aircraft while under repairs.
5 November 1944:
At 0500, departs Manila with KUMANO in 15-ship convoy MATA-31 with six freighters, an aircraft ferry, two kaikoban, five subchasers and land-based bombers providing air cover.
The convoy is spotted by Cdr John K. Fyfe's USS BATFISH (SS-310). About noon, Fyfe begins an attack approach on AOBA, but the convoy's escorts cause him to abort his attack. Later, Fyfe fires six torpedoes at a large cargo ship, but misses .
6 November 1944:
Cape Bolinao, Luzon. The convoy is attacked by USS GUITARRO (SS-363), BREAM (SS-243), RATON (SS-270) and the RAY (SS-271). Altogether, the submarines fire 23 torpedoes at the convoy. Two torpedoes hit KUMANO, but AOBA is not hit.
11 November 1944:
Arrives at Takao, Formosa. Undergoes further repairs.
9 December 1944:
12 December 1944:
Arrives at Kure where she is deemed irreparable.
1 January 1945:
Captain Murayama Seiroku (former CO of ABUKUMA) assumes command.
25 February 1945:
Reassigned to the Kure Naval Station.
28 February 1945:
Kure. Rated as Reserve ship.
19 March 1945:
Vice Admiral (later Admiral) Marc A. Mitscher's (former CO of HORNET, CV-8) Task Force 58 carriers USS ESSEX (CV-9), INTREPID (CV-11), HORNET (CV-12), WASP (CV-18), HANCOCK (CV-19), BENNINGTON (CV-20) and BELLEAU WOOD (CVL-24) make the first carrier attack on the Kure Naval Arsenal. More than 240 carrier aircraft attack the IJN ships in the harbor area.
24 April 1945:
Kure. AOBA is damaged heavily by aircraft from Task Force 38 and settles on the shallow bottom.
20 June 1945:
Moored off Nabe near Kure. Four additional twin 25-mm AA guns are fitted around the mainmast bringing her total 25-mm AA suite to 50 barrels (5x3, 10x2, 15x1). AOBA is rerated as a special guard ship (floating AA battery).
24 July 1945: The Final Destruction of the Imperial Japanese Navy:
Aircraft from Vice Admiral (later Admiral) John S. McCain's (former CO of RANGER, CV-4) Task Force 38 attack Kure. About 30 planes attack AOBA. She takes a direct hit by a bomb and another near miss that causes flooding. She takes on a list to starboard. Her crew counterfloods, but at 2200 hours, AOBA settles to the bottom in 25 feet of water.
28 July 1945:
AOBA's hulk is attacked by about 10 of Task Force 38's carrier aircraft. The hulk takes four bomb hits and is set afire. At 1600, it is attacked by 7th Air Force B-24 bombers and hit by four more 500-lb. bombs. The hull splits and the stern breaks off. The number of casualties is unknown but Captain Murayama survives the attacks.
15 August 1945:
Rerated as a Reserve ship.
20 November 1945:
Removed from the Navy List.
 Mt. Niitaka, located in Formosa (now Taiwan), was the highest point in the Japanese Empire at the time.
 Later, the four Australian POWs are sent to Japan. They survive the war.
 Postwar, the British try and convict Sakonjo as a war criminal, then execute him at Hong Kong.
Special thanks for assistance in researching the IJN officers mentioned in this TROM go to Mr. Jean-François Masson of Canada and Ian McLeod of the United Kingdom. Thanks also go to Randy Stone and Bill Somerville of the United States, "Adm. Gurita" of the Netherlands and Andrew Obluski of Poland.
- Bob Hackett and Sander Kingsepp.