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Possessing a powerful fleet of warships, prior to the start of World War II, the IJN had strategically planned to fight a war of fleet actions, and as a consequence delegated few resources to raiding merchant vessels. Nevertheless, in 1940, two passenger-cargo vessels&nbsp;– {{ship||Aikoku Maru|1940|2}} and {{ship||Hōkoku Maru}}&nbsp;– of the Osaka Shipping Line were requisitioned for conversion to [[armed merchant cruiser]]s (AMC)s, in anticipation of the likely thrust southward by the Japanese. These vessels were subsequently used as [[merchant raiders]] attacking Allied commercial shipping along vital [[sea lane|sea lanes of communication]] between Australia and the Middle East. Using their comprehensive armament and speed to their advantage, the raiders experienced a brief period of success. Japanese raiding in the Indian Ocean largely ceased by the end of 1942 after an action with a Dutch vessel, the {{MV|Ondina||2}} and a [[Royal Indian Navy]] [[corvette]], {{HMIS|Bengal|J243|6}} in which the ''Hōkoku Maru'' was sunk. {{TOC limit|2}} ==Background== Nations fighting [[United Kingdom|Britain]] during both [[world war]]s in the 20th century devoted substantial effort to the disruption of oceanic [[trade]] as a means of weakening the [[British Empire]]. In late 1942, [[Axis powers|Axis]] activities in the [[Indian Ocean]] had virtually come to an end. [[Germany|German]] [[merchant raider]]s, originally disrupting the [[shipping lane]]s in these waters, had with few exceptions, been destroyed by the [[Royal Navy]] or begun the long journey home.{{Citation needed|date=October 2015}} By virtue of their powerful battle fleets, the [[Imperial Japanese Navy]] (IJN) had strategically planned to fight a war of fleet actions ("[[Fleet action|Guerre d'escadre]]"), and as a consequence delegated few resources to raiding merchant vessels ("[[Guerre de course]]"). Nonetheless, other than their [[Easter Sunday Raid|successful sortie to Ceylon]] in April 1942, the Japanese Navy had decided to keep the pressure on the shipping lanes, primarily due to the Allies' ever-growing [[logistics|logistical]] strength in the war. Large and valuable [[tanker (ship)|tanker]]s maintained a continuous stream of [[oil]] and other products from the [[Middle East]] to [[Australia]] and surrounding islands. The continuous pleas by the Germans possibly<ref name=Visser/> had a large influence on this decision, as the Indian Ocean was the primary area of operations in which the two Axis powers had the most physical coordination with each other, in regards to re-supply and the exchange of military (naval) intelligence.{{Citation needed|date=October 2015}} ==Japanese merchant raiders== [[File:Aikoku Maru-1942.jpg|thumb|Japanese auxiliary cruiser ''Aikoku Maru'', 1942]] In 1940, two passenger-cargo vessels of the [[Osaka Shipping Line]] were requisitioned for conversion to [[armed merchant cruiser]]s (AMC)s, in anticipation of the likely thrust southward by the Japanese. The {{ship||Hōkoku Maru}} (the [[name ship]] of [[Hōkoku Maru-class ocean liner|the class]]) and {{ship||Aikoku Maru|1940|2}}, both under construction for the route between the [[Empire of Japan]] and South America, started their rebuilds in 1941, and by the time they were commissioned, the 10,470-ton vessels were heavily armed.<ref name=Visser>{{cite web|last=Visser |first=Jan |url=https://warfare.gq/dutcheastindies/ondina.html |title=The Ondina Story |date=1999–2000 |work=Forgotten Campaign: The Dutch East Indies Campaign 1941–1942 |url-status=live |archiveurl=https://web.archive.org/web/20110321233336/http://www.dutcheastindies.webs.com/ondina.html |archivedate=2011-03-21 }}</ref> The main armament consisted of eight [[14 cm/50 3rd Year Type naval gun|140&nbsp;mm/50 caliber]] guns, which were augmented by two 80&nbsp;mm guns, and four 25&nbsp;mm guns. There were four 533&nbsp;mm torpedo tubes in twin mounts, and each vessel had two [[Mitsubishi F1M]]2 "Pete" Type 0 observation seaplanes,<ref name="proceedings">{{cite journal |author=Layton, Edwin T. |title=24 Sentai&nbsp;– Japan's Commerce Raiders |journal=United States Naval Institute Proceedings |date=June 1976 |pages=53–61}}</ref> each armed with two fixed forward firing [[Type 97 aircraft machine gun|Type 97 machine guns]], one flexibly mounted rearward-firing [[Type 92 machine gun]] and 120&nbsp;kg of bombs.<ref name="C2">{{cite book |author=Collier, Basil |title=Japanese Aircraft of World War II |publisher=Mayflower Books |year=1979 |isbn=0-8317-5137-1 |page=[https://archive.org/details/japaneseaircraft00coll/page/101 101] |url-access=registration |url=https://archive.org/details/japaneseaircraft00coll/page/101 }}</ref> ==Initial deployment== With their heavy armament, the two Japanese merchant raiders could overpower any smaller combatant or merchant vessel, and their speed enabled them (in combination with their floatplanes) to search large areas of ocean. In service, they were organized as the 24th Special Cruiser Squadron under Rear-Admiral [[Moriharu Takeda]]. ''Hōkoku Maru'' was modified to serve as Admiral Takeda's flagship with space for his staff of four officers and eighteen men.<ref name="proceedings"/> The 24th Special Cruiser Squadron departed [[Hiroshima Bay]] on 15 November 1941 under radio silence and blacked out at night to arrive in a standby position at [[Jaluit Atoll]] in the [[Marshall Islands]]. They departed Jaluit on 26 November 1941 to patrol the sea lanes between Australia, [[Samoa]], [[Fiji]], the [[United States]], and the [[Panama Canal]]. The operational plan was for one ship to lie-to and drift while performing maintenance, as the other ship carried out a perimeter patrol searching for enemy shipping. The two ships would spend the hours of darkness within visual range; the ships then reversed roles the following day. Following the [[Attack on Pearl Harbor]], the search objective changed from avoiding detection to locating enemy commerce.<ref name="proceedings"/> Following sunset on 12 December 1941, ''Hōkoku Maru'' stopped the 6,210-ton United States freighter ''Vincent'' bound for the Panama Canal from [[Sydney, Australia]] at 23 south, 118 west. The old freighter was sunk after taking her crew of 38 aboard the two raiders. The Japanese ships then left the area to avoid any response to ''Vincent''{{'}}s radio [[SOS]].<ref name="proceedings"/> Routine searching resumed on 23 December 1941. On 31 December, a seaplane from ''Aikoku Maru'' found and circled the 3,275-ton United States freighter ''Malama'' bound for [[New Zealand]] from [[Honolulu]] with a cargo of [[US Army Air Force]] trucks and aircraft engines. The seaplane was observed by ''Malama'', but was apparently lost to operational problems before returning to ''Aikoku Maru''. The squadron commenced a search for the missing seaplane at 1810 and searched through the moonlit night. Aircraft were launched at 0700 on 1 January 1942 to expand the search. One of the seaplanes found ''Malama'' at 0910, circled at low altitude and ordered the ship to stop with a burst of machine gun fire. ''Malama'' began to broadcast distress messages which continued until 1415. Admiral Takeda was {{convert|130|mi}} away, but intercepted the distress calls and ordered the plane to return to be rearmed with bombs. ''Malama'' was scuttled by her crew at a position 25 south, 155 west when the aircraft returned. The squadron left the area after taking the freighter's crew of 38 aboard as prisoners.<ref name="proceedings"/> On 8 January 1942, the raiders resumed search operations and between 16 and 20 January the squadron intercepted extremely loud radio signals causing them to believe [[Allies of World War II|Allied]] warships were nearby. They successfully evaded detection by Admiral [[William Halsey]]'s [[Task Force 8]]. They replenished at [[Chuuk Lagoon|Truk]] on 4 February 1942 and transferred the prisoners to the Oita Bay Naval Air Command on 13 February.<ref name="proceedings"/> The squadron then entered the [[Kure Naval Arsenal|Kure Navy Yard]] where each ship received eight modern 14 cm (5.5-inch) guns to replace the four 15 cm (5.9-inch) guns of [[Russo-Japanese War]] vintage installed the previous autumn. More modern seaplanes were embarked when the squadron deployed to the Indian Ocean with the additional duty of resupplying the Japanese [[submarine]]s operating in the [[Mozambique Channel]]. Between 5 June and 13 July 1942, the submarines sank 21 ships, for a total of 92,498 tons.<ref name="proceedings"/> The ''Hōkoku Maru'' and ''Aikoku Maru'' added additional ships to that score. With these successes, they had sunk or captured five merchant ships within a year, totalling 31,303 tons. They left [[Singapore]] on 5 November on their fourth sortie, under the overall command of Captain Imazato Hiroshi.{{Citation needed|date=October 2015}} Victims of Japanese raiders included the {{SS|Genota|1934|2}}, a [[Netherlands|Dutch]] vessel of 7,987 tons, which was captured on 9 May 1942; the {{SS|Elysia||2}}, a [[United Kingdom|British]] vessel of 6,757 tons), which was sunk on 5 June 1942; and the {{SS|Hauraki||2}}, a New Zealand vessel of 7,112 tons, which was captured on 12 July 1942.{{citation needed|date=October 2015}} ==Action against the ''Ondina''== The {{MV|Ondina||2}} was a modern [[Tanker (ship)|tanker]] built for [[La Corona (company)|La Corona]], one of [[Royal Dutch Shell|Shell]]'s shipping companies. She was new, relatively fast and by contemporary standards not lightly armed with a [[4"/50 caliber gun]] on her stern and several machine guns for anti-aircraft use. Under Captain W. Horsman, she was deployed between [[Fremantle, Western Australia|Fremantle]] in Australia and [[Abadan, Iran|Abadan]] on the [[petroleum|oil]]-rich shores of the [[Persian Gulf]]. On her journey to Abadan, she was protected by a single [[corvette]], {{HMIS|Bengal|J243|6}} under the command of Lieutenant Commander W.J. Wilson, RNR. One of the Australian-type {{sclass|Bathurst|corvette|1}}/minesweepers, ''Bengal'' was one of four ships of her class that had been allocated to the [[Royal Indian Navy]]. She only had one 3-inch gun (a 4-inch gun was not available), which made her firepower barely enough to protect the ''Ondina'' from [[submarine]]s, let alone from enemy surface raiders. The two ships departed Fremantle on 5 November 1942, expecting a long but uneventful trip.<ref name=Visser/> ===Sightings=== On 11 November 1942 at 11:45 in the morning, naval authorities in Fremantle received an SOS signal sent out by the ''Bengal'', reporting that she and the ''Ondina'' were under attack by two [[Raider (piracy)|raiders]], identified as being Japanese, at position 19.38° South 93.5° East. The battle started when a lookout aboard ''Ondina'' sighted an unknown vessel at about {{convert|12,000|m|yd}}, bearing 270 degrees, followed by a ship of similar size.<ref name=Visser/> As no Allied ships were reported in the vicinity, the Allied sailors could only assume the ships bearing down on them were hostile and for some time these ships were even identified as Japanese aircraft carriers. On the ''Bengal'', the lookouts saw the two AMCs a few minutes later. The ships both made a 90 degree turn to starboard away from the enemy in a north-north-west direction. ''Bengal'' then turned and headed straight for the attackers, hoping to buy enough time for the ''Ondina'' to escape. She opened fire at 1200 hours from {{cvt|3,200|m|yd}}, followed by the ''Ondina'' at 1205 from {{cvt|8,000|m|yd}}. The sensible thing to do for the ''Ondina'' was to obey the order to escape, but the captain decided to stay, as his ship, armed with a 4-inch gun, was still the more powerful of the two. In addition, the ''Ondina'' could only do {{convert|12|kn}} while the Japanese ships could make {{convert|21|kn}}.<ref name=Visser/> ===Attack=== The ''Aikoku Maru'' under Captain [[Tamotsu Oishi]], and ''Hōkoku Maru'' under Captain [[Hiroshi Imazato]], commenced firing at 1200 hours and soon straddled the ''Ondina'' with their cruiser-armament. The first hit on ''Ondina'' ripped off a part of the main mast, leaving only a stump. The ''Ondina'' herself had her answer ready: the third shell fired was a hit on the superstructure of ''Hōkoku Maru'', but apparently with little effect.<ref name=Visser/> Content with the hit, the gun captain then ordered the gunners to concentrate their fire on the stern. A few moments later, a hit on the starboard torpedo mount turned the ''Hōkoku Maru'' into a ball of red and yellow flames, and as the ship emerged from the smoke, she was listing heavily to starboard and simultaneously started to settle by the stern. The explosion ripped off the stern and threw her two floatplanes overboard, while massive fires raged in the superstructure.<ref name=Visser/> ''Hōkoku Maru'' was not built as a warship, and therefore did not have a sufficient number of watertight bulkheads. Shells toppled from their lockers as a result of the increasing list and threw sailors overboard. Men, covered with blood and suffering from burns, tried to fight the flames. Reports came in indicating large fires in the engine-room and the loss of all electricity. There was little hope of salvaging the ''Hōkoku Maru'', Captain Imazato could do nothing else than order "abandon ship".<ref name=Visser/> The ''Aikoku Maru'' picked up a total of 278 survivors from a crew of 354. Captain Imazato was one of the 76 killed during the action. There were no reports of damage or casualties aboard the ''Aikoku Maru'', which soon avenged her sister ship, scoring several hits on ''Ondina''. Nevertheless, her shells and torpedoes had little effect on the empty tanker, as the large number of watertight tanks could keep it afloat under the most difficult circumstances. ''Aikoku Maru'' also fired at the ''Bengal'', which had shortened the range to about {{cvt|2,200|m|yd}}. One shell from the Japanese ship hit her in the forecastle, but did little damage. Her gunners had been firing continuously at the Japanese, claiming several hits but their ammunition supply was soon depleted. At 1245, her last shell had been fired and her captain decided there was little he could do for the ''Ondina''. He steamed away at full speed, chased by gun splashes. After laying a smokescreen, she took a hit in the stern which had no effect on her escape. The last the men aboard ''Bengal'' saw of the ''Ondina'' was her trying to evade the shells, continuously straddled by the ''Aikoku Maru''. A shell was seen hitting her abaft the bridge. Some time later, a second explosion was seen aboard ''Hōkoku Maru'', still burning and sinking. After leaving the scene, ''Bengal'' set course for [[Diego Garcia]], where the captain reported the ''Ondina'' and one enemy AMC sunk.<ref name=Visser/> ===Survival=== ''Bengal''{{'}}s captain was right about one thing, the ''Hokoku Maru'' had indeed sunk, but after ''Bengal'' had disappeared over the horizon, ''Ondina'' was still steaming around at full speed. As a tanker, she only had a limited ammunition supply. ''Aikoku Maru'' closed the range to {{cvt|3,500|m|yd}}, and over the next few minutes scored several hits, one of which was observed by the ''Bengal''. ''Ondina'' herself only had twelve shells left, four of which she fired at the ''Hōkoku Maru'', the rest at ''Aikoku Maru'', apparently without scoring a hit. A last attempt to escape by dumping smokebuoys overboard was unsuccessful, and the captain ordered the crew to abandon ship to avoid further bloodshed. The engines were stopped, the lifeboats lowered and a white flag was hoisted, all under continuous fire from the ''Aikoku Maru''. A few moments later, Captain Horsman was killed by a piece of shrapnel from a shell hitting the bridge. Two lifeboats and two rafts were lowered into the water and later, another lifeboat was in the water with the remainder of the crew. Most of the crew (with the exception of officers and guncrew) were Chinese, and they had been troublesome during the whole action, refusing to provide any assistance to save the ship.<ref name=Visser/> ''Aikoku Maru'' approached ''Ondina'', closing to about {{cvt|400|m|yd}} and fired two torpedoes to finish the ship off. Both left big holes in the starboard side, but did little to sink the ship itself. Its tanks had been empty and the ship remained afloat on the other, undamaged tanks, despite the 30 or 35 degree list. ''Aikoku Maru'' then changed course and the Japanese gunners opened fire on the drifting lifeboats. One sailor was killed, three others were badly wounded. One of them was a young British sailor named Henry, originally assigned to the ''Bengal''. Satisfied with the results, ''Aikoku Maru'' steamed away to pick up survivors from ''Hōkoku Maru''. The ''Aikoku Maru'' came back once more, firing a torpedo which missed the tanker. She paid scant attention to the survivors, convinced the ''Ondina'' was doomed.<ref name=Visser/> Meanwhile, the men in the lifeboats had given the deceased a seaman's burial and then exchanged thoughts about what to do next. The [[Chief mate|first officer]], Rehwinkel, wanted to return to the tanker, but only one man in the gun crew was willing to go with him. Most of the others were convinced the ''Ondina'' was about to go down. Not without trouble, Rehwinkel managed to assemble a small number of men and returned to the ship, where counterflooding reduced the list. Inspection revealed that her engines were also still intact. Small fires were extinguished and the last crew members in the lifeboats were taken aboard after they were convinced there was no danger of sinking. The long leg back to Fremantle began. The lifeboats were patched up as well as possible, in case the ''Aikoku Maru'' came back.<ref name=Visser/> ===Return=== The British sailor Henry was in very bad shape. He had a crushed leg and after two days the first officer was forced to send out a signal for help. The signal was sent uncoded, because the codebooks had all been thrown overboard when "abandon ship" was ordered. This unexpected signal caused a shock in [[Colombo]], as the ''Ondina'' had been reported sunk and logically, the British suspected a Japanese trick. A request went out from Fremantle to report her position.<ref name=Visser/> Wary of a trap, the ''Ondina'' did not reply. Without medical attention for her wounded, the ''Ondina'' steamed towards Fremantle. On the 17th an [[Australia|Australian]] [[PBY Catalina]] flying-boat was sighted, about {{convert|200|mi}} northwest of Fremantle. The lookouts had reported a ship some time earlier and the Catalina was asked if that ship could provide much needed help. The unknown vessel proved to be a hospital ship where doctors immediately began a series of blood transfusions which succeeded in saving Henry's life.<ref name=Visser/> On 18 November, the ''Ondina'' entered Fremantle after a journey only a few ships had experienced and even fewer had survived. The corvette ''Bengal'' had entered Diego Garcia the day before. ''Ondina'' remained in Australia as a [[depot ship]] until 1943, when she was finally repaired. Both ''Bengal'' and ''Ondina'' survived the war.<ref name=Visser/> ===Aftermath=== In retrospect, this battle was not only a tactical success for the Allies, it also had strategic implications. The loss of the ''Hōkoku Maru'' forced the Japanese to abandon raider warfare and subsequently the Imperial Japanese Navy did not try to break the lifeline again until early 1944 when a force of three heavy cruisers [[Japanese Indian Ocean raid (1944)|raided]] Allied shipping in the Indian Ocean.<ref name=Visser/> It remains uncertain as to which vessel fired the fatal shot that resulted in the destruction of the ''Hōkoku Maru''. Both the ''Ondina'' and ''Bengal'' claimed to have scored the vital hit, although the Japanese themselves thought it was the ''Ondina''. According to them, her shell hit the starboard torpedo launcher, causing the torpedo to explode. At the time, the ''Bengal'' was given the credit, which was used by the British as propaganda in India, where they were struggling to keep control of the local population.<ref name=Visser/> Nevertheless, for its actions during the battle, the ''Ondina'' was given a rare Dutch distinction, the [[Koninklijke Vermelding by Dagorder]], issued on 9 July 1948. Captain W. Horsman became [[Ridder in de Militaire Willemsorde der 4de Klasse]] posthumously and was Mentioned in Dispatches, while the gunner, Hammond, received the [[Distinguished Service Medal and the Bronzen Kruis]]. The captain of the ''Bengal'', Lieutenant-Commander Wilson, received the [[Distinguished Service Order]], while others of his crew were also decorated.<ref name=Visser/> ''Aikoku Maru'' was converted into a high-speed transport and was sunk in February 1944 during [[Operation Hailstone]], the bombardment by American aircraft of the Japanese base at Truk in the [[South Seas Mandate]].{{Citation needed|date=October 2015}} ==See also== *[[List of Japanese auxiliary cruiser commerce raiders]] ==Notes== {{reflist}} ==References== * {{cite web |first= Klemen |last= L |date= 2000 |title= Forgotten Campaign: The Dutch East Indies Campaign 1941–1942 |url= https://warfare.gq/dutcheastindies/index.html |access-date= 2021-03-30 |archive-date= 2011-07-26 |archive-url= https://web.archive.org/web/20110726053035/http://www.dutcheastindies.webs.com/index.html |url-status= dead }} ==External links== * [http://www.netherlandsnavy.nl Royal Netherlands Navy Warships of World War II] {{DEFAULTSORT:Japanese 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