Episodes
Tuesday Oct 31, 2023
- 101 - Pacific War - Invasion of Treasury Islands, October 24-31, 1943
Tuesday Oct 31, 2023
Tuesday Oct 31, 2023
Last time we spoke about the defense of Finschhafen. Finschhafen was a enormous staging camp for the allies now. The Japanese could not sit idly by allowing such a strategic location to be in allied hands. General Katagiri launched a major counter offensive, kicked off with signal fires from Sattelberg. He sent a force of raiders to try and neutralise some heavy allied artillery, but it ended in failure. Having not neutralised their big guns, the rest of the counter offensive fell to pieces. The Japanese would officially report 422 killed, 662 wounded. For the Australians they had 228 casualties of which 49 were dead. With the counter offensive done with, the allies now would go back on the offensive. The next large target was going to be the stronghold of sattelberg, but the Japanese were not going to make it easy on the allies. But today we are going to be jumping into some new places.
This episode is the invasion of the treasury islands
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.
For quite some time now we have been focusing on the New Guinea campaign, such as the offensives against Finschhafen and the Ramu valley. Today we are going to enter a new phase of the Pacific War. With the incoming invasions of the Gilbert and Marshall islands, the Northern Solomons and Western New Britain, General Douglas MacArthur and Admirals Hasley and Nimitz were going to turn up the heat. Admiral Halsey had just seized Vila, Barakoma, Munda and Rendova, gaining their valuable airfields for the forces of General Twinings AirSols to utilise. Within the central Solomons, Bougainville was finally within range of allied land-based aircraft. Lae, Salamaua and Finschhafen were taken, thus Operation Cartwheel would begin a new phase.
Back in July, plans were formed for General Vandegrifts 1st Marine Amphibious corps to seize airfields sites at Buin and Kahili, the important Japanese anchorage at Tonolei Harbor, and the Faisi and Ballale islands in the neighboring Shortlands. That same month, the 43rd and 37th divisions were involved in the New Georgia campaign. Of the 5 divisions remaining under his control, Admiral Halsey planned to use the fresh and unblooded 3rd Marine division and the Army’s 25th division for the invasion. He sought to keep the 2nd marine division and 3rd new zealand division in training for the conquest of Rabaul. Yet things had changed. Because of the intense resistance on New Georgia, the 25th division had to be committed. Then the decision to strike Makin and Tarawa in the Gilbert islands removed the 2nd marine division from Hasley’s south pacific area. These changes ultimately dictated he would need a substitution, and it was to be the 37th division, whom had suffered 1100 casualties on New Georgia already. Nevertheless the 37th was in better condition than the 25th. The 3rd marine divisions task went unchanged. Major General Allen Turnage’s 3rd Marine division was going to spearhead the invasion of Bougainville, with a launch date set for September. On top of this Halsey had received some reports indicating the Japanese were heavily reinforcing the Shortland Islands. He decided to bypass them and hit the Treasury island and Choiseul. It is also possible Halsey sought to perform these actions hoping to lure out the Japanese fleet into a major engagement. The treasury islands and Choiseul were lightly garrisoned, but held airfields that could be turned against Bougainville.
Meanwhile , General MacArthur was planning the next stepping stone towards the Philippines. His overall plan was to break the Bismarcks Barrier through a series of aggressive leaps along the New Guinea-Mindanao axis. New Guinea as we are all quite familiar with by now, is a logistical nightmare. Lush jungles, raging rivers, cold mountains, every time of geographical nightmare was present. Thus to traverse the western landmass of it only on land was not exactly desired. What MacArthur’s logistical team sought was to secure the 50 mile expanse of sea lying between New Guinea and New Britain. With that in hand Admiral Barbey’s 7th Amphibious force would be able to transport troops along the coast, a significantly easier method than having the poor boys battle through the jungle. Rooke Island split the sea into the Vitiaz Strait and the narrower Dampier Strait. General Wootten’s 9th Australian division were currently fighting for control of Vitiaz, but there had been no effort to date to hit the Dampier. MacArthur decided to capture Kavieng and the Admiralty Islands, because they represented enemy aerial threats against his westwards push through New Guinea. Closing in on the end of the year he also planned to amphibious assault Cape Gloucester, the northwestern point of New Britain which commanded the Dampier Strait. In hindsight the wisdom of landing at Cape Gloucester seems rather dubious. It was not necessary to seize the point in order to make use of the Vitiaz or Dampier strait. The Japanese did not have big artillery on the western end of New Britain to command the channel, the islands infrastructure was largely undeveloped. The only way the Japanese could interfere with the allied use of either strait was by torpedo boats, something they did not have many of. There of course was aircraft based on New Britain as well, but that would be neutralised by Kenney’s AirSols.
MacArthur planned to have the AirSols hit Rabaul continuously; to seize the Green Islands, the Admiralty Islands and Kavieng. The Western New Britain operation was codenamed Operation Dexterity which would be sub divided into Operations Lazaretto and Backhander. There would be a staggered attack first hitting Gasmata performed by the 2nd battalion, 228th regiment. They would establish an air base in the southern coast of the island, this was operation Lazaretto. Operation Backhander would be the invasion of Cape Gloucester. Some of the landings could be carried out in November, but MacArthur chose to wait until the new airfields were established in the Markham and Ramu valleys as they would provide close air support for the amphibious operations.
On September the 10th, Admiral Hasley sent staff to present his plan for the invasion to Bougainville to MacArthur’s staff. Halsey would be surprised to find MacArthur opposed using all their aircraft to strike Rabaul before the invasion of western New Britain. MacArthur proposed instead to continue heavy airstrikes against all Japanese airfields on Bougainville throughout October. Then in late October, Halsey’s forces could occupy the Treasury islands and possibly northern Choiseul. Northern Choiseul could provide radar coverage and PT boat bases. On the 1st of November, Halsey’s forces could then begin landing on Bougainville to form a beachhead before constructing a new airfield to host the AirSols so they could hit Rabaul just in time to take some pressure off MacArthur's troops advancing in New Guinea and New Britain. Thus MacArthur was determined to make the main goal of the operation not the securance over the entirety of Bougainville, but just a portion of it where an aerodrome could be established then used to batter Rabaul.
Halsey was presented two options for his landing site: there was Kieta Harbor sitting on the northeast coast and Empress Augusta Bay on the southwest coast. Kieta seemed the better location from which to launch air strikes against Rabaul. Kieta also held a protected harbor, requiring Halsey’s forces to move up the longer outside passage to secure Choiseul first. Empress Augusta Bay was on an exposed side of the island during an approaching monsoon season. It was closer to Rabaul and would only require the securing of the Treasury islands first. After further reconnaissance there was indications airfields could be constructed midway up the west coast of Bougainville at Cape Torokina on Empress Augusta Bay. Halsey chose it for the landing site stating on September 22nd “it’s Torokina. Now get on your horses!”
The operation against Cape Torokina was codenamed Cherryblossom and its task was handed to the hero of Guadalcanal, General Vandegrift who formed the plans but it would not be he who lead the operation. Vandegrit was promoted to commandant of the Marines, the first serving marine to become a four star general, he had to depart for Washington. His replacement was Major General Charles Barrett the former commander of the 3rd Marine division. Barret was given command of the 1st Marine Amphibious corps and the responsibility over operation Cherryblossom. His mission statement read “land in the vicinity of Cape Torokina, seize and occupy and defend a beachhead including Torata Island and adjacent island— 3,750 yards west of Cape Torokina—allowing approximately 2,250 yards inland from the beach and 3,600 yards east of Cape Torokina. To prepare and continue the attack in coordination with the 37th Infantry on arrival.” However the mission statement was to be his last major contribution to the war. On October 8th Barrett accidentally fell from the third floor of the officers quarters at Noumea and suffered a cerebral haemorrhage. He soon died afterwards and was recorded as an accidental death, but there was heavy speculation it was in fact a suicide. Thus the job fell to Major General Roy Geiger, the director of the marine aviation corp in washington.
For the naval aspect of the mission Hasley had to do with what he had on hand. He would not be receiving any significant naval reinforcements, because Admiral Nimitz feared that any vessels lent to the 3rd fleet would not be able to come back in time to help with the invasion of the Gilberts. What Halsey could count on was task force 38 commanded by Rear Admiral Frederick Sherman built around carrier Saratoga and later joined by the Princeton; Admiral Merrills task for 39 comprised of cruiser division 12 and destroyer division 23; and Task force 31 commanded by Admiral Wilkinson consisting of three destroyer squadrons, transports and covering ships. It would be Admiral Wilkinson who would bring over the 3rd marine division, the 1st brigade and 3rd New Zealand division to invade the Treasury islands. Rear Admiral George Fort would take the reigns of the first offensive and Wilkinson would looked over the Torokina landings.
Wilkinson would have 12 Attack transports and Amphibious cargo ships for the landings, just enough to get every echelon with their equipment over. The 3rd Marine division was reinforced with the 3rd marine defence battalion, the 198th coast artillery, the 2nd provisional marine raider regiment and the 1st marine parachute regiment. After landing at Cape Torokina they would later be reinforced by General Beightlers 37th division. The 29th, 34th and 36th New Zealander battalions of the 8th brigade group led by Brigadier Robert Row would hit the Treasury islands and help establish long range radar stations and a landing craft staging area. There was a final last minute change to the overall plan made by Halsey. They decided not to attempt seizing northern Choiseul but to instead send a marine raiding party around 656-725 men of the US 2nd Parachute battalion led by Lt Colonel Victor Krulak there to persuade the Japanese to divert forces to Choiseul from southern Bougainville.
To support the operation General Kenny’s 5th air force would smash the airfields in Rabaul while the AirSols 489 aircraft would hit airfields in and around Bougainville. General Twinning tactics were to harass the Japanese every day, so he launched a total of 158 flights in October, comprising 3259 sorties and land and naval targets in Hahili, Kara, Ballale, Buka, Bonis and Choiseul. The result of this incredible air campaign was 5 Japanese airfields pulverized, 136 enemy aircraft claimed destroyed at the cost of 26 allied aircraft shot down. Meanwhile on October 12th, Kenney launched a raid using 349 aircraft smashing airstrips, shipping and supply dumps. The 6000-ton IJN transport Keisho Maru was sunk alongside two smaller craft. On the 18th 54 B-25’s took off from Dobodura, but only caused minor damage. On October the 23rd, 24th and 25th daylight raids consisting of 45 B-242’s, 62 B-25’s and 61 B-24’s respectively managed to shoot down 9 enemy planes, destroyed 25 aircraft on the ground and damaged another 27. On October 29th, he tossed a raid at Vunakanau’s airdrome using 41 liberators covered by 75 P-38’s and managed to destroy around 10 aircraft. The enemies attention was certainly diverted away from Rabaul.
Now the Japanese knew an invasion of Bougainville was coming. They believed the main target of such an offensive would be first against the Shortlands or Kahili. General Kanda’s 6th division was deployed to reinforce these places. His 1st battalion, 45th regiment was placed at Kieta, the rd battalion and 4th south sea garrison was sent to reinforce Bougainville while the rest were sent to the Shortland islands. Bougainville was given north/south/east/west sectors garrisoned by numerous forces under Kanda. Admiral Koga also launched Operation RO, a plan devised to strengthen Rabaul. Koga’s intelligence indicated the Pacific Fleet was on a warpath, so he decided to take the entire combined fleet from Truk to Eniwetok, which Koga considered a good advance position where he could sortie and annihilate the enemy in a decisive naval battle. The combined fleet stayed a week in the uncomfortable and lonely lagoon until they departed having not found the allied pacific fleet. By October 24th the combined fleet travelled back to Truk while the aircrews of carriers Zuikaku, Shokaku and Zuiho reinforced Rabaul. 82 Zeros, 45 D3As, 40 B5Ns and 6 Yokosuka D4Y reconnaissance planes. 192 trained air crews in total would be in Rabaul by November 1st. They were just in time to intercept one of Kenney’s raids consisting of 75 b-25’s and 80 p-38s. The Japanese airmen claimed to have downed 9 B-25s, 10 P-38s at the cost of 20 aircraft and 3 small vessels. Koga alerted the 12th air fleet who were in Japan to prepare to head over to Rabaul, but instead of also sending the 8th fleet, he kept them back, still thinking a decisive naval battle would be on the menu soon in the central pacific.
General Sakai’s 17th division were transported to New Britain in late september. Their first echelon comprising of the 53rd regiment arrived on october 5th and immediately began to move west to reinforce Cape Gloucester and the 3rd battalion went to northern Bougainville. The remainder of the 17th division would arrive between November 5th and 12th, though the auxiliary cruiser Kurita Maru caring the 1st battalion, 81st regiment was sunk by the USS Grayson. 1087 men, most of the battalion, were lost.
The invasion of the Treasuries codenamed Operation Goodtime. They would establish a staging area, an advanced naval base at Blanche Harbor and a radar station on the north coast of Mono Island. It was hoped the assault on the Treasuries would confused the Japanese as to where the major effort would actually be. At this time there was a short supply of assault forces throughout the Pacific and the Bougainville invasion was mere days away. Thus it was difficult to comprehend why an entire brigade would be used to subdue a tiny enemy garrison on one small island. It has been theorised that Halsey and Vandegrift were reluctant to use some untried New Zealand troops in the more ambitious undertaking, but were also under pressure from their Anzac allies to see some action. For whatever reason the Treasury island operation would be one of the few examples of Allied overkill during the mid Pacific War.
The 8th Brigade had limited shipping available to them. They would have eight destroyer transports, eight LCIs, two LSTs, eight LCMs, three LCTs and two APCs, under the command of Admiral Fort who was using the USS Raton as his flagship. The 34th battalion was going to land on the north side of Stirling Island to secure a nearby airfield; the 29th and 36th battalions would land abreast near Falami Point on southern Mono and Major George Logan D company of the 34th, designated Logan force would land at the mouth of the Soanotalu River to establish a radar station with the help of 20 seabees. The USS Pringle and Philip would perform a bombardment to help. The operation was set into motion on October 27th when the convoy departed guadalcanal and the Russells.
George Fort’s destroyers approached Blanche Harbor during a storm and began their bombardment. The assault waves raced through the harbor in two columns. As was suspected the 34th met zero resistance, they immediately went to work sending out patrols to make certain if there were any Japanese on the island they would not get to surprise them. Mortars were set up on the nearby Watson island, cool theres an island bearing my name to support the landings on Mono. The landings on Mono met very little resistance, basically just a bunch of surprised Japanese naval troops who offered some half hearted gunfire before withdrawing. The New Zealanders went to work establishing a perimeter as the Japanese began opening fire using mortars which managed to knock out two LST’s killing 2 and wounding 30 men. Interesting to note this was the first amphibious assault launched by Kiwi’s since the horrible Gallipoli campaign of 1916 and it was the second combat operation undertaken by Kiwi’s during the Pacific War. The real resistance would come in the form of a air raid consisting of 25 vals who bombed the beachhead and support ships. The destroyers Cony took two hits; eight crewmen were killed and ten wounded. An allied fighter patrol managed to shoot down 12 vals during the raid. To their north, the Logan force faced no difficult landing at the mouth of the Soanotalu river. They quickly formed a 150 yard perimeter and began working on the radar station. By the end of the day, all but one LST had successfully unloaded and cleared Blanche harbor, however during the night the New Zealanders tossed back numerous counter attacks, particular around the Saveke river. By the 28th the Japanese survivors were retreating north in the hope of escaping to Bougainville, but along the way they ran into the Logan Force. On October 29th during the late afternoon, 20 Japanese attacked the western part of the Logan Forces perimeter. They were easily beaten off with mortars and rifle fire, leaving 5 dead Japanese behind. The next day saw some intermittent firing against concealed Japanese. Scouts eventually figured out there was a larger number of Japanese to the west of the perimeter, but the area between Soanotalu and Malasi was clear of the enemy.
November began with the rest of the brigade coming over. The radar station was already up and running and the Logan Force had built themselves a small blockhouse near the landing barge. That said blockhouse immediately became the objective of the Japanese, since it represented the only hope of them escaping the island. As Brigadier Row’s men began to occupy the central and northern parts of Mono, the Japanese began to infiltrate the Logan Forces perimeter. On the night of November 1st, the main breech was made across the News Zealanders line. A ton of Japanese had infiltrated the lines and managed to cut telephone wires from the blockhouse to the company HQ. Soon after this was accomplished a concerted attack was made against the blockhouse. 6 New Zealanders and 3 Americans defended it. They had automatic weapons, some 50 and 30 cal machine guns, but they were soon put out of action by the attacking Japanese who could have numbered between 70-100 men. The fight for the blockhouse would continue until dawn, with the surviving defenders beating off numerous attacks, mainly by tossing grenades. Captain Kirk, Sergeant DD Hannafin were both killed during the fight. Command of the blockhouse then fell to a cook of D Company, Private J.E Smith. By daybreak the Japanese finally were beaten off as the 3 remaining survivors were all wounded. 26 Japanese had been killed trying to overrun the blockhouse and seize the landing craft. Elsewhere across the perimeter the Japanese attacked throughout the night seeing another 15 dead Japanese in the western section and 9 in the east. It was to be there best chance at taking the blockhouse, for the next few days their attacks were much smaller and by November 4th, New Zealander patrols were fanning out and killing or capturing stragglers. The last significant action on Mono would be on November 6th when a dozen Japanese were routed from a cave during a two hour firefight east of Soanatalu. Operation Goodtime resulted in the annihilation of a Japanese garrison roughly 200 men strong, but it came at a cost. 40 New Zealanders and 12 Americans were killed with 174 wounded. The allies got their supply bases and radar station.
Over on Choiseul, Operation Blissful was about to kick off. In an attempt to make the Japanese believe the Shortland islands were the target for their offensive, General Vandegrift tossed Lt Colonel Victor Krulaks 2nd Parachute battalion, roughly 656 men at a beach near the village of Voza. On October 27th the men and their equipment were loaded onto 8 LCMS and during the night the paratroopers were transferred over to four destroyer transports, the Kilty, Ward, Crosby and McKean, the same ships that had just been used to transport the New Zealanders for Operation Goodtime. Forts destroyers provided escort as the Paramarine landed at Voza shortly after midnight without any resistance. During the morning of the 28th they began unloading supplies from landing crafts that had been concealed on a smaller island offshore. Once landed they carried them up a narrow trail leading from the beach a mile northwest of Voza upon some high ground which would be their first base camp. Nearly a hundred friendly natives helped the marines carry the equipment up the beach and they also helped guide the men. Allied radio broadcasting finally alerted the Japanese to the imminent danger to southern Bougainville as Krulaks men began establishing their perimeter.
The morning of the 29th brought an enemy strafing attack upon them and the native guides reported to Krulak that there was a barge staging base at Sangigai, the main Japanese position on Choiseul bay, garrisoned by around 150 men. Krulak decided that was to be the first objective, he sent out patrols going north and south. In the north Lt Averill with the help of native guides discover considerable evidence of the Japanese presence, abandoned equipment and rations, but no Japanese. In the south two patrols scouted the Japanese base near Sangigai. Krulak led one of the patrols personally and managed to surprise some Japanese who were unloading a barge. They killed 7 Japanese and sunk the barge before pulling out. The other patrol group ran into a Japanese platoon and got into a skirmish seeing another 7 dead Japanese. Thus Krulak got his confirmation there indeed was a Japanese base at Sangigai.
Early on the 30th, Krulak requested an air strike at it arrived at 6am. 12 Avengers with 26 fighter escorts hit Sangigai. Unfortunately some of the planes mistook the marines at Voza for the enemy and strafed them as well. No marines were killed but one of their boats was sunk, that Krulak had planned to use. As a result of the boat getting sunk, Companies E and 5 departed Voza overland to hit Sangigai. A Japanese outpost along the Vagara river opened fire on the paratroopers, but was easily overwhelmed. Krulak then divided his forces to perform a two pronged assault. Company E led by Captain Robert Manchester would advance along the coastline to hit the Japanese from the north, while Krulak with Company F would move inland to hit them from the rear.
Company E quickly advanced along the coast and began shelling the town with mortars and rockets during the afternoon, only to find out it was abandoned. The Japanese had taken up a new position on some high grounder in the interior. So the paramarines began destroying and looting the village. Meanwhile company F were advancing through rough terrain to try and secure some high ground near Sangigai where the retreating Japanese were just passing through. The Japanese literally walked right into F company and a hour long fight broke out. The Japanese outnumbered F company and as Krulak would later report “the outcome appeared to be in question, until the Japs destroyed their chances by an uncoordinated banzai charge which was badly cut up by our machine guns. Seventy-two Japs were killed and an undetermined number wounded. Marine losses were 6 killed, 1 missing and 12 wounded." The marines had 6 deaths, 12 wounded and one man missing. Krulak was wounded as well as F companies commander Spencer Pratt. The Japanese suffered a devastating 72 casualties
Back over at E company after plundering the village they came across some documents and Krulak reported "The one that fascinated me, it was a chart that portrayed the minefields around southern Bougainville. When I reported this, the night after the Sangigai attack, I saw my first flash message. I had never seen one before. It came back and said, "Transmit at once the coordinates of the limits of the minefields and all channels as shown going through it." So we laboriously encoded the critical locations and sent them off. To an armada going into that area this is not incidental information. This is necessary information. Halsey in true Halsey fashion was not satisfied to know where the minefields were; he, before the Torokina landings, sent in a minelayer there and dropped mines in the entrance ways to those channels and they got two Japanese ships.” E company then retired to the Vagara river and was later evacuated by boat back to the Voza area. F company followed suite but was delayed by the heavy engagement they had. The men stayed to bury their dead.
The friendly natives reported a Japanese concentration to the north near the Warrior River, so Krulak sent a strong patrol up by boat to check it out. On November 1, the large patrol of 87 paratroopers from Company G, led by Major Warner Bigger, headed north by landing craft towards Nukiki with orders "destroy the southern outposts of CHOISEUL BAY, and if possible to shell the Jap supply depot on GUPPY ISLAND." Major Bigger began an overland march along the eastern bank of the river and after crossing the warrior, their native guides became lost so they all had to bivouac for the night. In the early morning of November 2nd, Biggers men found themselves surrounded by Japanese who began infiltrating their perimeter from the rear. Bigger had the men continue north along the beach where the surprise attacked a small enemy outpost of 4 men. They managed to kill 3 of 4, but the last man ran away, thus the element of surprise was gone. Bigger knew the jig was up he could not hope to attack the main objective so instead he ordered the men to go shell Guppy island.
G Company setup some 60mm mortars in the water and fired 143 rounds at the island setting up two large fires, one looked to have hit a fuel dump. The Japanese were taken by surprise there and only offered resistance in the form of some poorly directed machine gun bursts. On the way back G company had to fight their way through because of the infiltrators. Krulak was notified of the situation and alerted a PT boat base at Vella Lavella. Lt Arthur Berndtson had 5 PT boats under his command there, 2 were already assigned to other missions, another was under repair. PT 59 only had ⅓ tanks worth of fuel, but her commander, Lt John F Kennedy, yes he is back in action, agreed to rescue the boys. Kennedy believed he had enough fuel to get to Choiseul and another boat could tow them back to base. Despite overheating the engines, at around 9:30 PT 59 escorted a small convoy to Voza and Bigger’s men were off loaded. The PT-59 ran out of fuel on the return trip down the slot and was towed back to Lambu Lambu Cove.
By this point the landings at Cape Torokina had been carried out, so a diversion was not really needed anymore. Furthermore the Japanese were moving in on the base camp from all directions. On the night of November 3rd, just in the nick of time, 3 LCIs from Vella Lavella arrived to successfully load Krulaks paratroopers and got them out of there before dawn of the 4th. The Paratroopers had been outnumbered 6-1. They managed to kill an estimated 143 Japanese, destroyed a major staging base at Sangigai, sunk two barges and destroyed a considerable amount of enemy fuel and supplies on Guppy island. The cost was 13 dead and 13 wounded. Krulaks after action report mentioned evidence that the Japanese had sent reinforcements from the Shortland islands to counter the Choiseul operation. On November 1st, the day of the Cape Torokina landings, the Japanese had sent a large bomer force south to Choiseul hunting a reported Task Force. The Japanese found nothing, and by the time they diverted back to Empress Augusta Bay, the landings were done, American fighters were ready to deal with them. It seems the Japanese had been greatly confused from all the activity around Bougainville, particularly from many intercepted messages. Its hard to say how successful the Choiseul raid actually was. It’s possible the Japanese fell for the diversion, but no one really knows.
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The diversionary raids may or may not have had an effect on the landings at Cape Torokina. Regardless the multiple operations were all successful and the Japanese seemed none the wiser. Now the stranglehold over Bougainville would begin.