- 67 - Pacific War - Battle at the Bismarck Sea, February 28 - March 7, 1943

Last time we spoke about the landing at Amchitka and the invasion of the Russell Islands. The Aleutian island campaign saw a lot of action when the allies decided to investigate whether Amchitka island would be suitable for a new airfield and what the Japanese intentions were with it. A race began between the two, but it would be the Americans who would seize the island and begin the process of building up an airfield upon it. Then over in the south Pacific, the Japanese had finished up Operation KE and with it had used and abandoned the Russell Islands. The allies quickly launched an invasion of the islands prompting the Japanese to send some air raids, but all for naught. Now with the Russells in hand, the Americans had a launching point to attack New Georgia. Yet today we are going to jump into one of the major naval battles of 1943.

This episode is the battle of the Bismarck Sea.

Welcome to the Pacific War Podcast Week by Week, I am your dutiful host Craig Watson. But, before we start I want to also remind you this podcast is only made possible through the efforts of Kings and Generals over at Youtube. Perhaps you want to learn more about world war two? Kings and Generals have an assortment of episodes on world war two and much more  so go give them a look over on Youtube. So please subscribe to Kings and Generals over at Youtube and to continue helping us produce this content please check out www.patreon.com/kingsandgenerals. If you are still hungry for some more history related content, over on my channel, the Pacific War Channel you can find a few videos all the way from the Opium Wars of the 1800’s until the end of the Pacific War in 1945. 

Last time we were in New Guinea the forces of Brigadier Moten had arrived in the nick of time to save Wau from the main Japanese thrust.The Australians were pouring reinforcements and supplies via transport aircraft daily. On January 31st 35 aircraft had made 71 trips, the next day 40 aircraft made 53 trips. This allowed the Kanga force to increase to 3000 men and receive heavy equipment necessary to smash the Japanese. Facing larger numbers and possible encirclement, Major General Toru Okabe had to order his men to withdraw. With that order came the lost hope of capturing Wau it seemed. By February the 1st, Moten had 201 officers and 2965 soldiers of all ranks at his disposal. He began sending patrols across the Black Cat trail and the Jap trail. He quickly surmised the Japanese threat was strongest in the Crystal Creek area where they had established a headquarters The Australians neutralized the crystal Creek area and began pushing the Japanese towards Mubo. By late February the Australians controlled the area from Waipali to Buibaining and a large part of the Mubo valley. Nerve wrecking patrols set off multiple ambushes and skirmishes for countless days. The Australian high command could only authorize such limited activity as they did not yet possess sufficient numbers to undertake further major offensive operations. Moten was awarded a bar to his distinguished service order for “his high order of leadership and control at Wau”.

While the Australians were tossing all they could via aerial transport, the Japanese attempted to thwart this. Aerial strikes were sent to hit the airstrip at Wau, but the typically terrible New Guinea weather hampered the Japanese. Aircraft dispatch from Rabaul were unable to locate Wau through the torrential weather and would return back without any success. Then on February 6th, 8 P-39’s of the 40th fighter Squadron were escorting 5 Dakota transports incoming to Wau when they sighted 24 Japanese aircraft. Captain Thomas Winburn led the P-39s to engage the enemy claiming to have downed 11 Zeros and a Sally. Simultaneously 8 P-40’s of the 7th fighter squadron were escorts other Dakota’s inbound for Wau when they sighed 12 Japanese bombers attempted to bomb the airstrip. The Dakota’s were turned back at the last second as the P-40’s engaged the bombers claiming to have downed 7 aircraft. On the ground at the airstrip in Wau were 4 Dakota’s while 5 circled its skies hoping to land after the combat was over. Second Lt Robert Schwensen was circling around in his Dakota and was shot down by a Japanese bomber, he alongside 4 other crew died. Another grounded Dakota was damaged and a CAC Wirraway was destroyed by a bomber. The increased aerial pressure prompted Major General Ennis Whitehead over in Port Moresby to order 3 squadrons to join the battle for Wau’s skies. P-38’s of the 39th and 9th fighter squadrons and P-40’s of the 41st fighter Squadron intercepted a Japanese fighters and bombers claiming to have shot down over 23 aircraft. The Japanese were decisively losing the war of the skies, showcasing the limitations of their offensive capabilities in the area.

Now while the Japanese surprise attack against Wau had failed and they had been pushed back heavily, all was not lost for the Japanese. They still held some high ground around Waipali and Guadagasal. Yet in order to turn things around, Major General Toru Okabe would require significant reinforcements to defeat Moten’s 17th Brigade. Things were extremely chaotic at this time for the Japanese high command. The battle for guadalcanal collapsed, leading to Operation KE which involved a major shuffling of troops all over the place. They first ordered Lt General Jusei Aoki’s 20th division to depart Korea for Guadalcanal and for Lt General Heisuke Abe’s 41st division to depart China for Rabaul. Lt General Hitoshi Imamura commander of the Japanese 8th area army at Rabaul ordered Lt General Hatazo Adachi’s 18th army to secure Wewak, Tuluvu and Madang in New Guinea. Adachi was the one who ordered Major General Toru Okabe, commander of the 51st division and the 102nd infantry regiment to capture Wau in order to further secure Lae and Salamaua. However with the conclusion of Operation KE, the focus was reshifted from the Solomons to New Guinea. General Imamura and Vice admiral Gunichi Mikawa, the commander of the south east area fleet developed a plan to move the 18th army HQ and the rest of the main body of the 51st division from Rabaul to Lae. They would also follow this up by moving the remaining forces of the 20th division to Madang. The first movement was set for the 3rd of march and the second for march 10th. It was to be a very risky plan, as the allies held aerial supremacy. The 18th army held some war games indicated the operation would lose around 4 out of 10 transports and upto 40 aircraft. They believed the operation stood a 50/50 chance of success and there were limited alternatives. If they tried to land all the forces simply at Madang, the men would have to march over 230 km’s over swamplands, mountains and jungle terrain. It seems the Japanese were beginning to acknowledge their lack of success at logistics as this course of action was deemed impossible. 

Over on the Australian side, General MacKay sent word to Blamey that he feared the Japanese would make a second attempt to capture Wau. He reasoned that even with the projected arrival of reinforcements in the form of the 4th and 15th brigades, they would still be outnumbered by the Japanese. MacKay estimated the Japanese held around 7500 men in the Lae-Salamaua area while they held onto their position in the Mubo region. Because of this, he had restricted activity to patrolling to not allow for any gaps allowing an opening against Wau so that more men could be brought over for its defense. Despite the enormous success in transporting men to the area, supply continued to be a major issue. There was a major increase in the number of aircraft at the Dobodura airfields thanks to the capture of Buna allowing for men and materials to be tossed to Wau, but in early February General Whiteheads confided to MacKay that 2 of his squadrons of 18 aircraft were pressed to their limits and the bad weather was greatly reducing their ability to deliver the men and supplies. Whitehead predicted, correctly that the bad weather would continue for the next 6 weeks, which left typically 2 hour windows for the deliveries per day. Attempting to improve the situation General Blamey had begun the construction of a Jeep trail all the way back in January from Bulldog to Way. But during the process the surveyors quickly discovered the terrain was extremely formidable and the job would take many months. Native carriers performed the lionshare of work as the 68 mile trail would end up taking 4 months to complete.

Now during the campaign for Buna-Gona, the allies owed much of their success largely due to their control of the air, and this as we can see at Wau continued to be a vital factor. The Japanese of course held their large air and naval base at Rabaul and since the early days of the war remained an ongoing threat to air and sea supremacy in the region. Blanche Bay in Rabaul provided the Japanese with one of the best natural harbors in the south pacific. It is encircled by hills, is around 6 miles long and 2 and one half miles wide. It alongside 3 other harbors provided an anchorage for a large body of ships, as many as 60 by some accounts. The Japanese had built up the harbors and their defenses to more than 300 antiaircraft guns. By the fall of 1943 the Japanese had almost 100,000 men stationed at Rabaul, the vast majority being army troopers. The Southern fleet force had around 21,000 men under the command of Vice admiral Jinichi Kusaka. Air strength at Rabaul depending on reinforcements provided by the combined fleet, but in early 1943 they held a significant enough number to pose a major threat to the allied operations, if utilized properly.

General MacArthur was deeply concerned about Rabaul, despite having the number in theory to negate its threat. MacArthur consistently pushed for an invasion of eastern New Britain in early 1943 and disagreed on using airpower to negate Rebaul. Then during the bloody campaign against Buna-Gona he declared the decision to bypass Rabaul would “go down in history as one of times greatest military mistakes”. THEN later on he would agree that bypassing Rabaul was a good strategy and that it had largely been done because of his advisement. Basically what I am saying is MacArthur is full of shit and more worried about his autobiographies that actual decisions. Regardless of that, MacArthurs early suggestions indicated Rabaul was vitally important and needed to be neutralized. This is sort of a no brainer as you can imagine, it was one of Japan’s largest naval air force bases covering all major operations in the eastern and central solomons. Fortunately for the allies there was no unified command at Rabaul. As we all know the IJA and IJN did not get along very well and Rabaul’s operations is a great example of it. The IJA had fewer aircraft based regularly at Rabaul although its responsibility was to cover New Guinea. Throughout 1943 the IJN’s air forces were primarily concerning themselves with the Solomons, which would eventually see them losing nearly 400 aircraft and irreplaceable pilots for all their efforts.

Because of the catastrophe of the Guadalcanal campaign, Rabaul was largely neutralized by US bombers from the solomons. By mid February Imamura and Kusaka recognized the need to reinforce Lae. They had sent a 3 ship convoy on the 19th which went unmolested to Wewak and this emboldened them to brave the allied aerial supremacy. Thus on February 28th a convoy of 16 ships commanded by Rear Admiral Masatomi Kamura departed Rabaul. 6 transports, a oil tanker and their destroyer escorts would be combat loaded so that supplies and the men could be off loaded quickly to minimize turnaround time. Almost 7000 men, mostly from the 115th regiment of the 51st division and some SNLF were crowded onto the transports guarded by an escort force of 8 destroyers. Lt General Hatazo Adachi and his staff were on board accompanied by Lt General Hidemitsu Nakano and his staff. The planned route was to go along the northern coast of New Britain through the Bismarck Sea, to Cape Gloucester and then through the Vitiaz strait to the Huon Gulf. The Japanese commanders believed their movement would be masked by the terrible weather. 

Allied command began detecting signs of a major convoy operation in early february. On february 14th aerial photographs taken over Rabaul indicating over 79 vessels at port, including 45 merchant ships and 6 transports. It was clear to allied command a convoy was going to be dispatched, but its destination was unknown. Two days later naval codebreakers at FRUMEL in Melbourne and Washington DC decyphered some coded messages revealing the Japanese were going to send the convoy to Wewak, Madany and Lae. Other intercepted coded messages from the Japanese 11th air fleet to the convoy indicated they would reach Lae by March the 5th or by latest 12th. Another aerial reconnaissance over Rabaul on the 22nd indicated 59 merchant vessels were at harbor. Kenney read the Ultra intelligence to General MacArthur on the 25th and the prospect of 7000 Japanese being landed at Lae certainly disturbed him. Kenney then sent word to Whitehead of the proposed convoy date and warned him the Japanese would most likely perform a pre-convoy aerial strike. Kenney urged he cut back on the transport hours so the aircraft could be made ready the moment the convoy appeared. Kenney would fly over to Port Moresby on the 26th to speak to Whitehead personally and the two generals concluded the Japanese convoy was going to go through the Vitiaz strait. 

Now in the south west pacific conventional strategic bombing was not really on the menu as industrial targets in Japan were obviously too far away. Thus since the early days of the way, the primary mission of the allied bomber force in the region was to intercept Japanese supply lines, particularly their sea lanes. Some 416 sorties were flown in January of 1943, resulting in only 2 ships sunk and 3 ships damaged, clearly the allied tactics needed revamping. Captain Bill Garing of the RAAF, part of Kenney’s staff, held considerable experience in air to sea operations and he began to recommend that Japanese convoys should be met with simultaneous attacks from different altitudes and directions. This led allied air force brains to come up with some innovative tactics. In February of 1942 the RAAF began experimenting with “skip bombing”. Skip bombing was an anti-ship technique used primarily by the British and Germans in the atlantic. It involved flying ones aircraft just a dozen feet above the sea level towards a target whereupon bombers would release their bombs, which ideally would ricochet across the surface of the water to hit the sides of the ships or explode overhead, IE “skipping”. If you play world of warships, you know exactly what I am talking about, nasty stuff. Another similar technique involved bombs taking a low altitude between 200-500 feet and dropping around mast height, approximately 10-15 feet and 600 yards from their target, IE “Mast height bombing”. This when performed well would see the bombs smash into the sides of a ship. These two techniques paired with slow fuse bombs would see considerable use in an event we are about to jump into.

Now Kimura envisioned, by taking the route along the northern coast, that this would put enough distance between the convoy and allied reconnaissance aircraft until they reached Vitiaz strait. Kimura took the destroyer Shirayuki as his flagship to command the operation. Destroyer Tokitsukaze would carry General Adachi and destroyer Yukikaze would carry General Nakano. The idea was that upon arrival at Lae the ships would anchor 600 or so meters apart along the shoreline due west of the airfield around the mouth of the Busu river. They would use a smoke screen to cover the anchorage to make their unloading activity to hinder aerial attacks as well. A escort of 40 IJN and 6 IJA aircraft would provide aerial protection for the convoy from 5am to 6pm each day it operated. 

General Blamey wrote “every effort will be made by our own air force to deal with the enemy as he approaches”. Thus Generals Blamey and MacArthur tossed the job to General Kenney, the commander of allied air forces. Kenney had at his disposal the RAAF under air vice marshall William Bostock and the 5th air force led by Brigadier general Ennis Whitehead. In total 154 fighters, 34 light bombers, 41 medium bombers and 39 heavy bombers available for combat operations in New Guinea. The 5th air force was subdivided into two commands: the V fighter command  led by Brigadier General Paul Wurtsmith consisting of 95 fighters, some P-39’s, P-38’s and P-40s. Then there was V bomber command led by Brigadier General Howard Ramey which had 28 worn out B-26’s, 27 B-25’s, 55 B-17’s and 60 B-24’s. Alongside this Kenney and Whitehead had at their disposal the 3rd attack groups of light bombers, nicknamed the Grim Reapers which included a squadron of A-20 Bostons equipped with 4 .50 caliber guns and long range fuel tanks. You see the A-20 Bostons usually were equipped with .30 caliber machine guns and could not fly across the Owen stanley range from Port Moresby, but Kenney was very keen on the “attack aviation” concept which focused on using low-level strafing and bombing methods. Alongside the grim reapers was 2 squadrons of B-25’s that had been modified by Major Paul Pappy Gunn, the same man who had altered the Grim reapers. The B-25’s had their lower turrets and tail guns removed and instead had 4 .50 caliber machine guns installed in the nose and another 4 in the forward firing chin blisters. With the top turret firing its guns forward, the aircraft boasted an extraordinary strafing firepower and on top of that still carried 6 100 pound bombs and 60 23 pound fragmentation bombs. The fragmentation bombs were outfitted with small parachutes so they could be used for low-level bombing of airfield without damaging the aircraft trying to drop them. Honestly try to imagine this goliath beast firing those .50 cals, would have been like torrential rain of lead.  All of these modifications would allow aircraft like the B-25 to be much more capable of pulling off the masthead bombing technique without the need for a bombardier, which ironically was in opposition to their original role of carrying out bombardier assisted missions from altitude. The Australians could also count on the support of the No. 9 Group led by Captain William Garing consisting of 59 fighters, 26 light medium bombers and 2 heavy bombers; the no 73 wing of Hudson bombers, P-40 Kittyhawks and Beaufort bombers operating at Port Moresby and the no 71 Wing of Wirraways, A-20’s and Beaufighters operating out of Milne Bay. So needless to say a lot of allied airpower was on hand.

Now as I had mentioned prior, allied attempts to hit Japanese shipping, particularly that coming out of Rabaul had not shown much results in the past. So in order to increase the success of hitting this convoy, Garing persuaded Whitehead to rehearse a plan for the attacks, integrating all available aircraft. This specifically included performing the bomb skipping a masthead bombing techniques. Garing’s idea was to get all the aircraft to gather over Cape Ward Hunt at 9:30am so they could get themselves over the enemy convoy by 10am all at once to completely overwhelm the enemy escorting aircraft and anti-aircraft defenses. Two rehearsals were carried out, with the 2nd one turning out to be “damn good”.

 

On March the first at 2am the Convoy departed Rabaul. The convoy slowly made its way across the Bismarck Sea undetected as for the past two days major tropical storms had been occurring since February the 27th. However on March the 1st there was a clearing and a crew of patrolling B-24 Liberators managed to spot the convoy. They reported the sighting, prompting a dispatch of 8 B-17 to be sent to the location, but they failed to relocate the convoy. The Destroyer Tokitsukaze then intercepted an allied message stating their convoy had been spotted. This prompted Kimura to put the forces on full alert. General Adachi who was onboard the Tokitsukaze was uncensored by the report stating it was all part of the plan. His reasoning was that the allies were always going to find them, but with the terrible weather it would be unlikely they could manage to perform a decent attack.

 

At dawn on march the 2nd, a force of 6 RAAF A-20 Bostons coming out of Ward’s Strip at Port Moresby performed an air strike against Lae to hinder its use to the fighter escorts for the convoy. At 10am another B-24 liberator found the convoy, prompting another order for 8 B-17’s to be sent to attack. They would soon be followed up an hour later by a group of 20 B-17’s. The B-17’s planned to rendezvous with some P-38’s of the 9th fighter squadron, but they arrived too early to the convoy’s location and thus had to face the Japanese escort fighters on their own until the P-38’s eventually arrived to the scene. The first group of 8 B-17’s made their runs at the convoys through anti-aircraft fire and Zero fighters. They dropped 1000 lb bombs from 5000 feet claiming 5 critical bomb hits and sinking 3 merchant ships. The Kyokusei Maru was hit and sunk carrying 1200 IJA troops. The second group of B-17’s then showed up and luckily for them, 12 P-38’s had managed to haul it quickly enough to escort them in the nick of time to make their bombing runs. The B-17’s claimed to have sunk 4 enemy ships, but in reality only damaged two transports, the Teiyo Maru and Nojima. 8 Japanese fighters were shot down with 13 others damaged at the cost of 9 B-17’s damaged in return. While the Kyokusei Maru was sinking, the destroyers Asagumo and Yukikaze managed to rescue 950 troops out of the water alongside 2 mountain guns. Because destroyers are fast, the two ships opted detach from the convoy and haul it over to Lae to drop off the survivors before trying to regroup to reperform their escort duties. The survivors and General Nakano would be brought to Lae by the end of the day and the two destroyers turned around to rejoin the convoy by daybreak.

Throughout the rest of the day the convoy would be subjected to multiple heavy bomber attacks. 11 B-18s made an evening strike inflicting minor damage to another transport. The days efforts saw the convoy zigzagging to save its life from high level bombing and this led it to be stretched out for 20km. Rather bizarrely, the Japanese fighter escorts showed little aggression towards the American heavy bombers and departed rather early from the days action. During the night PBY Catalina’s from the No 11 RAAF squadron began shadowing the convoy. One PBY flown by Flight Lt Terry Duigan received a message from HQ to shadow the convoy in order to guide a strike of torpedo bombers, which did not make sense, so he discarded it. However the message as he would later find out, was not necessarily for him, but rather to trick the enemy. The allied intelligence officers back at HQ were certain the Japanese were listening in on their radio traffic so they began sending false messages.

Early the next day, Admiral Kimura made what would be a disastrous decision, ordering his ships to mark the time and circle in the dark. This process cost the convoy 2 hours of night cover and the reasons behind the decision are quite unknown. It is theorized Kimura was trying to make sure his convoy would appear to the destination at the same time their fighter escort would show up for the daily activity. In any case, Kimura’s convoy would not see their escort nor stormy weather at sunrise to their dismay. Sunrise on march the 3rd saw a beautiful sunny day, a terrible omen. The convoy was now within striking distance of Milne Bay and 8 Bristol Beaufort Torpedo bombers of the No 100 RAAF squadron took off at 4am. Only 2 Beauforts would make it to the convoy and fail to cause any damage. The Japanese commanders however were now alerted by the presence of torpedo bombers, so they began maneuvers, turning the beam of their ships to the enemy aircraft, exposing the full length of their ships to strafing. 

 

At 5:10am, 4 Australian A-20’s performed an airstrike against Lae, catching several grounded planes that were needed to escort the convoy. At 8:30am, a striking force of 90 aircraft consisting of a squadron of B-17’s, 4 squadrons of B-25’s including some grim reapers, a squadron of Beaufighters, a squadron of A-20’s and 2 squadrons of P-38 lightnings. The striking group departed Port Moresby and headed for Cape Ward Hunt while 22 A-20 Bostons of No 22 RAAF squadron attacked Lae to reduce the convoys air cover. The striking group took up their practiced formation with the B-17’s leading the echelon at 7000 feet, the B-25’s behind them at 4000 feet, the Beaufighters at 500 feet, some other B-25’s designated to perform low level bombing at around 700 feet and the P-38 lightings hanging above at 12,000 feet.

 

At 10am, 13 B-17s reached the convoy first and began bombing them from 7000 feet causing the convoy to zigzag, dispersing their formation and reducing the concentration of their anti-aircraft fire considerably. The B-17’s attracted the Zero fighter escort, but were quickly pounced upon by the P-38 lightnings. One B-17 was shot apart by a Zero and its crew took to parachuting. The parachuting men were fired upon by Zero fighters and when they hit the water some Zero’s continued to strafe them. Although the B-17’s inflicted no damage, 7 Zero’s would be shot down by the P-38s reducing the convoy's protection.

 

Meanwhile the Beaufighters were coming in just above the waves making it look like they were Beaufort torpedo bombers. Admiral Kimura ordered his ships to maneuver so their beams were towards the enemy expecting torpedo runs and this exposed his ships to the Beaufighters strafing runs. The Australian pilots began to open up with their 6 .303 machine guns and 4 20mm Hispano cannons. The combination unleashed a carnage seeing rivers of fire erupt across the lengths of the ships. Some vessels were stopped dead in the water as a result of their officers being cut down to pieces across their bridges. Much of the convoys anti-aircraft positions were destroyed by the strafing. After the first strafing run, B-17’s and B-25s began to make their bombing runs rather unexpectedly, leaving the BEaufighters scrambling to flying as the bombs were literally falling down around them. Out of 37 bombs dropped by the 90th attack Squadron Grim reapers, 17 were claimed as direct hits. 12 A-20 bostons from the 89th bomb squadron claim while performing low level bombing that 11 out of 20 bombs made hits. The B-25’s of the 405th bomb squadron dropped 35 500 lb bombs from low level and claimed 4 direct hits, these bombs had 5 second delay fuses. The bombing runs caused massive chaos amongst the convoy, so much so that pilots claimed to have seen 2 japanese vessel collide into another. The modified grim reappears strafed the convoy during all of the runs. A squadron leader named Brian Blackjack Waler recalled this “I was observing it from the side and all these ships - honestly, I’ve never seen anything like it. Dozens of planes all going in at zero feet. In fact, I could see a Beaufighter and a B-25 both going in at the same target and I thought, get out one of you!” The assortment of differing aircraft were coming in at all sorts of angles and all sorts of altitudes, many low. 

 

Garrett Middlebrook, a co-pilot in one of the B-25s, described the ferocity of the strafing attacks:

“They went in and hit this troop ship. What I saw looked like little sticks, maybe a foot long or something like that, or splinters flying up off the deck of ship; they’d fly all around ... and twist crazily in the air and fall out in the water. Then I realized what I was watching were human beings. I was watching hundreds of those Japanese just blown off the deck by those machine guns. They just splintered around the air like sticks in a whirlwind and they’d fall in the water.”

The Shirayuki was the first ship to be hit, by a combination of strafing and bombing attacks. Just about all of the men on her bridge were strafed, including Kimura who was wounded. She received a bomb hit that stated a magazine explosion breaking her stern off and causing her to sink. Her crew transferred to the Shikinami as the Shirayuki was scuttled. The Tokitsukaze was hit fatally and her crew had to abandon her. The Arashio was strafed violently causing her to collide with the transport Nojima disabling both ships. Both ships would be abandoned as the allies strafed and bombed them sinking Nojima eventually. The remaining destroyers struggled to save survivors in the water.

 

By 10:15, all 7 of the transports had been hit and we're sinking 100km’s southeast of Finschhafen. After midway a second series of attacks were made by B-17’s and A-20’s who strafed and bombed the Asashio while she was trying to rescue survivors. The 4 remaining destroyers withdrew up the Vitiaz strait and were joined by the destroyer Hatsuyuki coming from Long Island. The Hatsuyuki and Uranami brought 2700 survivors back to Rabaul while the 3 other destroyers continued picking up survivors and would eventually bring them to Kavieng by march 5th. During the night of march 3rd, a force of 10 PT boats led by Lt Commander Barry Atkins made an attempt to finish off the convoy alongside some B-17’s and Beaufighters. 2 of the PT boats hit submerged debris and were turned back, but the other 8 continued and arrived off Lae in the early hours of March 4th. Atkins spotted a fire that turned out to be the transport Oigawa Maru. Pt-143 and PT-150 fired torpedoes at it, further crippling and eventually sinking the transport. The Asashio was hit by a B-17 with a 500 bomb bomb as she was grabbing survivors and sunk. Amongst the 4 surviving destroyers it would only be the Yikikaze that went undamaged. The PT boats and allied aircraft attacked the Japanese rescue vessels and survivors clinging to rafts or floating in the sea. The decision to attack the survivors was highly unpopular amongst the pilots and sailors but was deemed necessary on the grounds the rescued Japanese were most likely going to be landed for military duty if not attacked.  One Japanese survivor wrote in his diary of the ordeal “The Boeing B-17 is most terrifying. We are repeating the failure of Guadalcanal. Most regrettable!” Many allied pilots were sicked by these actions.  

One pilot recalled "as per instructions, we flew around to see if some ships were still afloat. Some were sinking and burning--we san a lifeboat with about 20 people. I thought these poor guys. But we had a job to do because if they got to shore, they were going to kill our guys. So I came around and strafed them. One of the cruel things of war which had to be done"

 

Another pilot recounted this “At the briefing, Australian officer had told us we must not permit a single enemy to reach the shores of New Guinea. They explained the suffering, agony, and loss by our troops in having to hunt down and kill a suicidal Jap”.

It is estimated around 352 Japanese troops were killed during these attacks adding to the 2890 casualties suffered during the battle. Another 224 survivors in the water would be rescued by the I-17 and I-26 shuffled over to various nearby islands such as Goodenough island. Of the 116 Japanese that would be landed on Goodenough island, 72 would be killed with 42 captured and 2 missing.

 

Officials at the Advanced air echelon at Port Moresby went through the claims of their pilots and sailors and believed a great number of ships had been destroyed. Their conclusion was that 12 transports, 3 cruisers and 7 destroyers had been sunk, which MacArthur readily believed, although a report would later come out to claim the number was actually 4 destroyers and 8 transports. Later the Japanese would admit that 3000 soldiers had been killed during the battle, but this did not count the hundreds of sailors lost on the ships, nor the pilots in the aircraft. MacArthur would make a commendation on march the 4th for all the air force units in New Guinea stating “it cannot fail to go down in history as one of the most complete and annihilating combats of all time. My pride and satisfaction in you is boundless” Kenney added to it stating “tell the whole gang that I am so proud of them I am about to blow a fuse”. MacArthur would also at the offset claim they had caused 15,000 enemy casualties describing the battle as a decisive aerial engagement for the southwest pacific theater. And it certainly was a decisive victory, it was a devastating loss for Japan that showcased Japan was no longer capable of being on the offensive. I will finish off the tale of the battle of the Bismarck sea with a account from Reiji Masuda, a crewman aboard the destroyer Arashio, as it leaves a vivid and harrowing account of the attack.

 

They would come in on you at low altitude, and they’d skip bombs across the water like you’d throw a stone. That’s how they bombed us. All seven of the remaining transports were enveloped in flames. Their masts tumbled down, their bridges flew to pieces, the ammunition they were carrying was hit, and whole ships blew up. . . . They hit us amidships. B-17s, fighters, skip-bombers, and torpedo bombers. On our side, we were madly firing, but we had no chance to beat them off. Our bridge was hit by two five-hundred-pound bombs. Nobody could have survived. The captain, the chief navigator, the gunnery and torpedo chiefs, and the chief medical officer were all killed in action. The chief navigator’s blackened body was hanging there, all alone. Then a second air attack came in. We were hit by thirty shells from port to starboard. The ship shook violently. Bullet fragments and shrapnel made it look like a beehive. All the steam pipes burst. The ship became boiling hot. We tried to abandon ship, but planes flying almost as low as the masts sprayed us with machine-guns. Hands were shot off, stomachs blown open. Most of the crew were murdered or wounded there. Hundreds were swimming in the ocean. Nobody was there to rescue them. They were wiped out, carried away by a strong current running at roughly four or five knots.

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The battle of the Bismarck sea proved the Japanese were indeed incapable of being on the offensive, the allies were now in the driving seat. It also showcased war produces wild innovations that can prove quite deadly.