- 123 - Pacific War - The Bombing of Hollandia and Palau , March 26 - April 2, 1944

Last time we spoke about Operation Thursday and the ferocious counteroffensive on Bougainville. The Chindits embarked on their second great raid, this time better equipped, better trained and more numerous than ever. With a literal armada of beasts of burden they marched through Burma, forded the Chindwin and began attacking and establishing strongholds. This was all done in coordination with Slim and Stilwell’s forces, trying to break the Japanese and gradually seize back lost territory. Wingate had his work cut out for him as the Chindits were providing real results, yet unfortunately he would not have long to see them. Wingate was killed in a B-25 crash and it felt like the personality of the Chindits left with him. Over on Bougainville the Japanese tossed as much as they could to try and break through the Americans perimeter to hit the airfield, but it was all for naught. 

This episode is the Bombing of Hollandia and Palau 

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. 

Operation Brewer saw General MacArthur tossing cavalrymen against the eastern side of Los Negros. General Swift’s 1st Cavalry Division successfully landed on Los Negros and managed to secure Seedler Harbor quickly. After this, General Chase’s 1st Brigade was given the task of mopping up the island. By march 11th daily patrols had determined that the entire area from the Mokerang Peninsula to Southeast Point and as far west as Porlaka was generally free of the enemy. The 1st Squadron, 5th Cavalry pushed its perimeter at Momote west and south to the water barriers of Lemondrol Creek and Ihon Lagoon. The 12th Cavalry beachhead at Salami continuously patrolled into the interior and encountered so few Japanese that it was clear the enemy lacked sufficient numbers to harass the troops on the peninsula. West of Lemondrol Creek  was a completely different story. While the troops holding the beachheads from Lombrum to Papitalai waited for supply channels to be established, they probed to locate the center of enemy resistance. The 12th Cavalry was responsible for the beachheads at Papitalai Mission and Lombrum. The 2nd Squadron had captured Papitalai Mission and on the 11th the 1st Squadron took over Lombrum Point, relieving the 7th Cavalry so they could attack Manus Island. The 5th Cavalry held the Papitalai perimeter with Troop F. When that regiment extended its control over the area east of Lemondrol and Porharmenemen Creeks on the 11th, the 2nd Squadron moved into the Porlaka area while the 1st Squadron on the left flank was concentrated near Southeast Point. It was planned that the 12th Cavalry would do most of its fighting in the northern sector moving inland from the coastal positions to cut oil the Japanese hammered at by the 5th Cavalry as it pushed west on both sides of Lemondrol Creek. Since the 8th, every Troop F patrol from Papitalai had run into enemy resistance in the hilly country to the west. Although small patrols of squad size or slightly larger were held up day after day by resistance about 800 yards west of Papitalai, these first encounters did not reveal the full strength of the enemy pocket. When an attack by a platoon of Troop E, reinforced by two tanks, two bazookas, and flamethrowers, was repulsed on the 11th, the strength of the enemy strongpoint became clearer. The enemy was well dug in along the ridge, marked by a series of knobs, running west from Papitalai. The highest point, Hill 260, about 2,500 yards from Papitalai, not to be mistaken for Hill 260 on Bougainville by the way, this was probably the center of the enemies defense. However, on two knobs east of 260, well-defended outposts prevented any movement farther into the interior. The position 800 yards from Papitalai which had repulsed Troop E was defended by a platoon with knee mortars and at least 3 machine guns. The total enemy strength facing the 5th Cavalry was estimated at 150 to 200 Japanese. 

Now that was the ongoings of Los Negros, but Brigadier General Verne Mudge’s 2nd Brigade was now preparing to invade Manus island. American intelligence was unsure of the disposition of the enemy on Manus. A rough estimate was that 2700 Japanese were concentrated there and would most likely make a stand at Lorengau. The Americans expected the Japanese would put up a last losing fight. But because of the lack of knowledge of their numbers and disposition on the largest island of the Admiralties, this would require careful planning for the invasion. Fighting into the interior where the mountain range would provide defensive positions and through the swampy forests covering the rest of the island would not be easy. There were only 4 roads winding about the island and converging at Lorengau would be suitable for moving vehicles, and long stretches of these red-clay roads would be impassable in rainy weather. Surrounding jungle and swamps would confine any large-scale movement to the roads. Therefore, the plan was to pin the enemy to the coast where it was hoped he had concentrated his main strength.

Mudge planned to land Troops A and C of the 8th cavalry regiment at the Yellow beaches of Lugos Mission. When the 8th Cavalry had secured a beachhead, including the Lugos Mission itself, each squadron would advance east, the 1st Squadron along the coast using the Number Three Road, and the 2nd along an inland road known as the Number One Road, to execute a wide sweep toward Lorengau. If a sizeable garrison was concentrated at fortified Lorengau, the inland arm of this attack would prevent the enemy from escaping along the only road leading west to the mountain areas. Prior to the assault, 3 patrols had been sent to Bear Point on Manus and on the islands of Butjo Luo and Hauwei. Mudge planned to deploy artillery at these places to aid in his assault. Bear Point was found to have no enemy, but unfortunately it was not a suitable place for artillery placement. The northern island of Butjo Luo was an excellent site for artillery and was found to be unoccupied. Hauwei would turn out to be another story. The American  patrol moved out from Salami on an LCV and a PT boat, landing without opposition on the western end of the island. Major Carter S. Vaden of the 99th Field Artillery Battalion, threw two grenades into a well camouflaged bunker about 10 yards from the beach and the party progressed inland. Immediately after the grenade explosions, a mortar shell landed on the beach in the rear of the party. From three sides, machine-gun, rifle, and mortar fire opened up. Fortunately, the grenades had evidently sprung a planned ambush prematurely and the party was not cut off from the rear. Using their submachine guns, the men of the patrol were able to hold back the enemy. They were aided by some supporting fire from the PT Boat and the .30-caliber machine gun of the LCV. After 2 and a half hours they managed to withdraw to the water's edge. The PT boat had returned to its tender after the commanding officer was wounded, and the coxswain of the LCV shouted and motioned for the cavalrymen to get on board, but only five of them reached the boat, as the others were engaged with the enemy on shore. The LCV had troubles of its own; enemy mortar and machine-gun fire found its range and wounded all on board except two. Then the LCV grounded on submerged coral and sank 200 yards offshore after receiving a direct hit from a mortar. The wounded men, put into lifejackets, floated about in the water. When the remaining members of the patrol on shore were wading out toward the LCV, 6 Japanese attempted to set up a machine gun on the beach. The men cut them down with their submachine guns. Still under fire, the cavalrymen swam out to the survivors of the LCV, making a group of 18 men out in the water. Failing to attract the notice of the destroyers nearby, the tired men had to stay in the water for 3 hours until a PT boat picked them up. At the same time a destroyer closed in to the island to draw hostile fire and bombard enemy positions on the western end. Hauwei was going to need extra help to be secured.

The 2nd Squadron, 7th cavalry departed from Lombrum Point on the 11th and landed on Butjo Luo. The next day, Destroyer gunfire and rockets as well as 105-mm concentrations from the 61st Field Artillery Battalion at Mokerang point battered Hauwei. Then Kittyhawks of the 77th Pursuit Squadron at Momote airfield bombed and strafed the Hauwei. After all of this, the 2nd Squadron landed on Hauwei meeting slight resistance at the beach. They advanced 300 yards further inland where they became pinned down by heavy rifle, machine gun and mortar fire. The Japanese were firing upon them from some bunkers, prompting the 2nd Squadron to dig in and allow the artillery teams to hit them throughout the night. During the night the 61st Field Artillery Battalion from the north end of Mokerang Plantation fired 1,000 rounds to harass the enemy. This fire was directed so accurately and carefully that it was brought down on the enemy within 100 yards of the cavalrymen's positions without any casualties to our troops, and helped minimize enemy activity during the night. 

At 10am on the 13th, with the support of a medium tank, the cavalrymen stormed the bunkers along the edges of the island. The Japanese put up a valiant fight, but they lacked anti-tank weaponry. By 12pm, the 2nd Squadron successfully mopped up the enemy, suffering 8 deaths and 46 wounded. They estimated they had killed 43 Japanese who were all naval personnel. Having secured the two islands, now one artillery battalion set up at Butjo Luo and two others upon Hauwei. The next day at 7:00am the 3 artillery battalions opened fire upon the Lorengau Township area. This target was chosen to divert the enemy's attention from the landing beaches around Lugos Mission. Meanwhile 4 destroyers bombarded Lorengau with their 5-inch guns. Then 18 B-25’s from  Nadzab bombed and strafed the Lugos Mission and the beach areas until H - 5 minutes. Between 9:07 and 9:25, they dropped 81 500-pound bombs, strafed with more than 44,000 rounds of machine-gun fire, and cleared the target just as the troops were coming ashore.  

The 8th cavalry departed Salami, heading for the Yellow Beaches covered by 3 rocket boats. The wave of buffaloes drew up to the beaches, and it appeared that they were going to make it without opposition until an enemy machine gun opened up from east of the landing beaches. Immediately the buffaloes responded with their own machine-gun fire, and two PT boats closed in to support. With 100 rounds from a flak boat added to this fire the machine gun was silenced. Two waves of landing craft followed the buffaloes to the shore in rapid succession and the narrow beaches, backed either by jungle or a high bluff, were soon congested with assault troops. On the eastern beach, Troop A began a vigorous drive toward Lugos Mission and the Number Three Road leading to the Lorengau airdrome. Captain Raymond J. Jennings, led the troops to storm the bluff where Lugos Mission was located and overran the mission before the few Japanese who had survived the bombardment could put up effective opposition. The men worked their way into the mission compound and cleared out the area with grenades. Troop A was soon on its way along Number Three Road leaving behind it, some 20 dead SNLF, without the loss of a single cavalryman. Meanwhile Troop C advanced west 800 yards to a ridge where they stopped and dug in, having accomplished their mission of establishing a defensive perimeter to protect the landing of successive elements.

Other waves of the 1st and 2nd Squadrons began landing ashore as the 7th cavalry took up the beachhead. The 2nd squadron advanced over some ridges towards the Number One Road, while Troop A reduced enemy bunkers progressing roughly a mile from the beach. By 11:20am, they came across 3 mutually-supporting bunkers that halted their advance. It took Troop B’s support alongside artillery and aerial bombardment to destroy the bunkers to they could advance. Meanwhile the 1st Squadron emerged out of the jungle into a clearing at 5pm, where they occupied a ridge overlooking the southern edge of the airdrome, where they would dig in. The 2nd Squadron reached Number One Road, where they ran into 3 bunkers. The following morning with tank support the squadron overran the bunkers and advanced northeast towards Lorengau. The cavalrymen would destroy 7 bunkers during their trek, before halting 100 yards before Lorengau.

To the north, Troop A was clearing a coconut grove north of the airstrip, from which Japanese snipers were harassing them throughout the night. Troop C advanced along the southern edge near the airstip where they came across another pack of bunkers. Since the snipers north of the strip had been cleared out by noon, an attack could be made in the open. Troop B, supported by light tanks on their left advanced down the strip, followed by Troop D and the squadron HQ. Troop A advanced across the strip and then east along the north edge. By 1:00pm Troop C managed to destroy two bunkers using grenades, forcing the Japanese inhabitants to flee out into the open where they were cut down. Troop C then was about to dash across the airstrip when they suddenly became pinned down by friendly fire from Troop B who were trying to disengage the enemy before them. The 1st squadron suffered 9 deaths and 19 wounded during the action. Mudge then ordered them to relieve Troop C, who were holding some high ground south of the airstrip. 

On the morning of the 17th after extensive naval and artillery bombardment, Mudge launched a coordinated attack with the 2nd Squadron advancing south of the airstrip and the 1st Squadron assaulting the bunkers that had held up the 8th cavalry’s advance. The bombardments had nearly annihilated the bunkers, allowing the 1st squadron to face only slight resistance. They soon attacked a secondary Japanese position further east upon a ridge. This position was also met with artillery and mortar fire and would fall by 11:30am. After this the cavalrymen were able to obliterate the remaining pillboxes and advance across the pulverized airstrip.

Meanwhile the 2nd Squadron of the 7th and 8th cavalry regiments linked up along the Number One Road near Lorengau. The 8th Cavalry had encountered little resistance on the road, destroying whatever bunkers were encountered with the aid of fire from medium tanks. The light tank accompanying the squadron had a track blown off by the first Japanese anti tank mine encountered in the operation. By 1pm, all the front-line troops around the airstrip to Number one Road linked up forming a general advance. By this point the backbone of the enemies resistance had been broken, leaving little to resistance them. For the next 1,500 yards to the river, it took them  2 hours because the Japanese had hurriedly put in large quantities of anti-tank and anti-personnel mines. They had been emplaced, however, with no prepared plan, and many were poorly camouflaged or left lying completely on the surface. The Japanese had also dug holes and refilled them without emplacing any mines. As the cavalrymen slowly made their way to the river, they suffered a few casualties from the mines.

The 7th cavalry reached the Lorengau River by 3pm, from there they dispatched a reconnaissance platoon who quickly came under fire from bunkers atop some hills overlooking Lorengau. Lorengau was sheltered in a valley surrounded by jungle-covered hills rising to 400 feet. The Japanese believed an attack would come from the sea, thus many of their defenses were sited to cover the shoreline. The offshore approaches and the three roads entering the settlement from the east, south, and north were also covered by defensive positions. From the position held by the 2nd Brigade, the only approach to the town was over a sandbar at the mouth of the Lorengau River, a slow-moving stream 20 yards wide and 10 to 20 feet deep, except at the sandbar. The beach area, which the troops would then have to cross, was heavily protected. Naval demolition mines, containing 20 pounds of black powder and detonated by a master switch located in a control bunker up the hillside, covered the beach. About 100 yards inland from the beach a series of rifle pits and gun emplacements were constructed on the side of a dike which paralleled the shore. On the hills surrounding the harbor, beach, and town about a dozen heavy bunkers were used to reinforce the fires of beach defenses and to add depth to the position. As usual these bunkers were carefully camouflaged, although the concentration of naval and artillery fire as well as repeated bombings had disclosed the location of several. Mudge ordered the men to dig in for the night on the west bank of the river and establish a perimeter defense against some expected counterattacks that would not develop in the end. The next morning, after a mortar and artillery bombardment, the 2nd Squadron, 8th Cavalry advanced down from its ridge positions to the mouth of the broad river, with its Reconnaissance Platoon leading. Upon fording the river, the cavalrymen only faced a handful of machine-guns. Facing almost no opposition, the squadron was thus able to secure Lorengau, counting 87 dead Japanese in the remains of the town. 

Colonel Ezaki seemed to have disappeared during the battle over Papitalai leaving his men leaderless. The Japanese naval troops in desperation began retreating towards Rossum, with American patrols hot on their trail. There would be a furious fight down the Rossum Road. 1st Lt. James M. Concannon captured an enemy map of the area during his patrol to which he exclaimed, "Well, here goes Concannon to get himself a Purple Heart!" Lt. Concannon's platoon had been ordered to go along Number Two Road which went to Rossum and from there to Kelaua Harbor, through the heart of the Japanese defenses indicated on the captured map. Hardly had the platoon crossed the outpost line still held by Troop E along Number Two Road when it came under fire from a pair of bunkers sited to cover the track. Lieutenant Concannon and one of his men were wounded. The platoon sergeant assumed command and attempted to flank the position. When the attempt was not successful, the sergeant decided to withdraw and report, as his mission was one of reconnaissance. Upon receiving the information that the enemy was in position not 200 yards from the outpost line, Colonel Bradley directed Major Shore to send Troop A back up the track to neutralize the enemy position. The troop was reinforced with machine guns and two 37-mm antitank guns. 

Troop A of the 8th cavalry were ordered to deal with the newly discovered enemy bunkers. Corporal Peter J. Armstrong and Armando V. Valencia set their heavy machine-gun in position at a range of 30 yards from one of the bunkers. Having disclosed his position by laying a continuous burst of fire on the bunker, Corporal Armstrong was wounded by sniper fire. Armstrong continued firing until a grenade knocked him unconscious. Although the gun had been hit in several places and was leaking a steady stream from its water jacket, Corporal Valencia took over and continued firing at the bunker slits until the machine-gun froze; then he fired with his submachine-gun until it was knocked out of his hands by an enemy bullet. In the meantime the mortars had obtained four direct hits on the bunkers, and the anti-tank guns had made two. Corporals Armstrong and Valencia were later awarded the Distinguished Service Cross, and for its action during the day Troop A was given a unit citation. 

After taking out the stubborn position, Troop A advanced along the road under heavy sniper fire, until they were relieved by Troop C. Troop C immediately was met with a heavy Japanese counterattack shortly after nightfall. The counterattack was launched by 8 Japanese using rifle grenades and small arms. Considering the size of the attacking force, the casualties of the troop were heavy: 2 killed and 10 wounded. All the Japanese were killed, largely due to a quick adjustment by the forward observer of the 61st Field Artillery Battalion followed by four volleys fired for effect. By this point the Americans had achieved all their objectives for the Admiralty Islands campaign, the only thing left to do was mop up the islands. The remaining IJA troops were now withdrawing across the Loniu Passage over to Manus. The 8th cavalry were soon given the task of clearing the eastern end of Manus, while the 7th cavalry would clear out the Rossum Road. Yet that is all for this campaign as we are now heading over to New Guinea.

General MacArthur was planning his new Western New Guinea offensive. After the directives given on March 12th, Admiral Nimitz had been instructed to provide support for his Hollandia operation. The Japanese began their occupation of Hollandia  early in April of 1942 but paid little attention to the region for a year. Then  Allied air reconnaissance disclosed that the enemy was constructing airfields on the Lake Sentani Plain. This development progressed slowly until late 1943, by which time successive reverses in the air and on the ground in eastern New Guinea and the Bismarck Archipelago, together with increasing shipping losses in the same region, began to demonstrate to the Japanese the vulnerability of their air and supply bases east of Hollandia. In late 1943 and early 1944, the Japanese  built 3 airfields on the Lake Sentani Plain and started a fourth at Tami, on the seacoast east of Humboldt Bay. In addition, because of shipping losses east of Hollandia, the Japanese began to develop Humboldt Bay into a major supply base and transshipment point. Large ships would unload at Hollandia, whence cargo would be carried by barge to points southeast along the coast of New Guinea as far as Wewak over 215 miles away. Much of the cargo of the large ships remained at Hollandia to build up the base there.

Admiral Nimitz decided to dispatch two fast carrier groups of Admiral Mitscher’s Task Force 58 to conduct fighter sweeps against Hollandia and the Wakde-Sarmi area in order to keep their airfields neutralized. MacArthur south for the carries to support the troops for 8 days after the landings. But Nimitz believed this would put the carriers in risk, because the Japanese would be able to launch aircraft from all over the Dutch East Indies or even the Philippines. It was decided Task Force 58 would remain in the Hollandia region for only 3 days after the landings were made. As a result MacArthur opted to supplement using land-based aircraft against Hollandia. To obtain this he would need to capture an airfield in Northern New Guinea, just east of the main objective. He chose an Aitape, it was a lightly guarded area and already partially developed by the Japanese, such as the incomplete airfields around the Tadji Plantation. Once the men landed ashore at Aitape, allied forces could provide flank protection for Haollandia against any westward actions by the Japanese 18th Army. For the assault against Aitape, MacArthur planned to use the 8 escort carriers of Task Force 78 under the command of Rear Admiral Ralph E. Daviso.

Now for the amphibious assault, Admiral Kinkaid gave the job to Admiral Barbey’s task force 77 who were divided into 3 attack groups. They would bring over General Eichelberger’s 1st corp who would perform the Hollandia operation, codenamed Operation Reckless. I think it is a pretty suitable name for a MacArthur operation. For the Hollandia part of the operation, the 19th and 21st regiments of Major General Frederick Irving's 24th division would land at Tanahmerah Bay; the 162nd and 186th regiments of General Fuller’s 41st division would land at Humboldt Bay. For the operation against Aitape, codenamed Persecution, the 163rd regiment of the 41st division led by General Doe would perform the initial landings. To soften up the enemy, General Kenny’s air forces began bombing Wewak and Hansa in mid March, then in early April they began neutralizing the airfields to try and deceive General Adachi into believing they were the next allied target.

Additionally, MacArthur asked Admiral Spruance to perform a carrier raid against the Palau Islands, codenamed Operation Desecrate One, followed by strikes on Yap and Woleai in the eastern Carolines, in order to prevent the Japanese from reinforcing Western New Guinea. Admiral Mitscher’s carriers departed Majuro on the 22nd of March and made their way around the Carolines, trying to sneak past Truk undetected. Despite their best efforts, Japanese search planes from Truk managed to spot them on their 3rd day at sea. This prompted Admiral Spruance to advance the day of the raid from April 1st to March 30th. Meanwhile after sighting the allied naval forces, Admiral Koga ordered an evacuation of Palau, seeing a large number of warships and merchant shipping flee the area for Tawi-Tawi. The US submarines Gar, Blackfish, Tang and Archerfish were stationed to operate against the withdrawing ships and as plane guards. On the 23rd, Tunny sank the Japanese submarine I-42 and damaged the 14,850-ton tanker Iro. To the north of Palau, during an attack on the 26th, Tullibee was hit and sunk by her own circling torpedo. Bashaw torpedoed a 4,317-ton freighter escorted by the destroyers Minazuki and Yuzuki. On the 29th, the super battleship Musashi departed Palau under cover of darkness to avoid an expected air raid, and encountered Tunny, which fired six torpedoes at the battleship; five of them missed, but the sixth blew a hole 5.8 meters in diameter near the bow, flooding her with 3000 tonnes of water. The torpedo hit killed 7 crewmen and wounded another 11. After temporary repairs, Musashi sailed for Japan later that night and arrived at Kure Naval Arsenal on April 3. 

On the 30th, Task Force 58 reached its assembly point 90 miles south of the Palau Islands. The Task Force was met with a Japanese air strike consisting of mostly Betty’s and Oscars who were easily swept aside. Then fast carriers Enterprise, Bunker Hill, Hornet, Yorktown and Lexington launched their first air strikes against Palaus. For the next day and a half, the Americans flew hundreds of sorties over these islands, striking the airfields and shooting down all planes they could find. The attacks saw 40 Japanese ships at Palau and Angaur sunk, another 4 were badly damaged. 93 aerial victories would be won over Palau and Avengers from Lexington, Bunker Hill and Hornet laid extensive mines around the channels and approaches to Palau. This was the first tactical aerial mining of the Pacific War performed by carrier aircraft. In response, Admiral Koga asked for help from neighboring islands. He received 9 B6N torpedo bombers from Yap who attempted a night attack against Task Force 58 on the 31st. Unfortunately for the Japanese, 4 Hellcats from Cabot managed to intercept them, successfully shooting all of them down.

Koga certainly had a lot on his plate. Due to the recent attacks against Truk and now Palau, Koga decided to transfer his HQ from the Musashi to Davao on March 31st. Most of his senior staff and cryptographers boarded 3 H8K flying boats enroute to Mindanao from Palau. All 3 of the flying boats ran straight into a typhoon just off of Cebu, two of them got lost. These flying boats were carrying Admiral Koga and Vice Admiral Fukudome Shigeru, his chief of staff. Koga’s plan would end up crashing enroute to Davao, killing all aboard. Thus another commander in chief of the IJN forces had met his end to a plane crash. The other plane carrying Fukudome crashed off the coast of Cebu. Fukudome had a harrowing experience, but escaped the aircraft and began swimming to the island. To make matters even worse, while swimming Fukudome was grabbed by Filipino guerillas who brought him over to Lt Colonel James Cushing. Cushing was a former engineer in the Philippines who helped organize a resistance movement. Now captured Fukudome was certainly a large prize, yet a even bigger one came on April 3rd. A Filipino shopkeeper named Pedro Gantuangoko spotted a box floating offshore on the 3rd and picked it up in his fishing boat. The box contained a red leather briefcase carrying the Z plan. Fukudome had assumed the box sank with the aircraft, but in a twist of fate it did not.

Now while this was going on, Lt Colonel Seiiti Ohnisi had dispatched troops to search for survivors of the aircraft crash and for the box containing the Z plan. Ohnisi hundreds of Filipino villagers interrogated, tortured and killed, entire Filipino villages were burnt to the ground. Eventually Ohnisi cornered Cushing and they struck a deal. On April 10th, with Japanese forces on Cebu hot on the heels of the guerillas, the American commander, Lt-Colonel Cushing, arranged to return Fukudome and the other prisoners to the Japanese in return for a cessation of the massacre of Filipino civilians. Three days later, the Filipinos who had found the box containing Plan Z and the code book when it washed ashore, turned them over to Cushing. The codebook was recognized for what it was when the guerillas discovered the Japanese were offering a 50000 peso reward for its return. On April 27, Cushing arranged for the items to be picked up by the submarine Crevalle. Traveling mostly on the surface for speed, and diving only when needed, the submarine survived depth charging twice, finally arriving at Darwin on May 19. From there, the documents were flown to Brisbane later that day. Allied codebreakers looked forward with anticipation to the arrival of the codebook, since they had been stymied by changes to the IJN code since the summer of 1942 and had not “read the enemy’s mail” in any detail since the week before the Battle of Midway. The documents outlined the new strategy for the defense of the inner perimeter islands around Japan with the intention of drawing the US fleet in for a decisive showdown. The documents were sent to Admiral Nimitz and would prove extremely valuable during the Battle of the Philippines Sea. The documents were so vital, the Americans performed a covert operation sending them back to the Philippines by submarine and placed near the wreckage of the flying boat by American divers. It was one of the greatest intelligence coups of WW2. Thus Admiral Koga was dead, the Z plan fell into allied hands and the IJN was now leaderless. Koga’s death would not be announced until May and he was replaced by Admiral Toyoda Soemu. Koga was promoted to Marshal Admiral posthumously and granted a state funeral. According to pilot Nagatsuka Ryuji: “The death of Admiral Koga, successor to Admiral Yamamoto, had been another shock for the Japanese nation. These distressing circumstances had forced the naval and military Chiefs of Staff to resign. They had been replaced by General Tojo and Admiral Shimada.” 

Now back to the invasion, on April 1st Rear-Admiral John Reeves’ carriers launched  airstrikes against Yap and Ulithi, with the three task groups then attacking Woleai. \25 American aircraft were lost, with 26 out of 44 aircrews rescued thanks to submarine Harder. Meanwhile, the fleet’s Hellcats win 111 aerial victories and destroy 46 grounded aircraft on the three atolls. With this, Task Force 58 successfully removed Palau as a threat to the Hollandia-Aitape operation. Alongside this South and Southwest Pacific land-based aircraft from bases in eastern New Guinea and the Admiralties, bombed islands in the eastern Carolines and undertook many long reconnaissance missions. Meanwhile Kenney’s air forces were busy neutralizing enemy air bases in Western New Guinea and the eastern islands of the Dutch East Indies. Most of the strategic support missions flown to western New Guinea were undertaken by US 5th Air Force while the Royal Australian Air Forces Command took responsibility for the majority of the strikes against the islands in the eastern Dutch East Indies. The operations were intensified roughly 6 weeks before the landings at Hollandia and Aitape. 

 

On March 30th, Kenney shifted the weight of his attacks from the Wewak area to Hollandia, where the Japanese 6th Air Division had recently retreated from Wewak and received strong reinforcements. The airforces also performed a full aerial reconnaissance taking photos of Hollandia’s 3 airdromes on March. Added to this were radio intercepts and intelligence ereports, allowing the allies to estimate the Japanese had around 351 aircraft there. With this information at hand, Kenney launched Liberators armed with small 20 pound fragmentation bombs to perform a concentrated bombing against the enemy airfield. Since the Allies hoped to rehabilitate the Hollandia strips as quickly as possible, hits on the runways with heavy ordnance would be avoided. Fighter cover would be provided by long-range P-38's, which would escort the bombers over the target, and by shorter-range P-47's, which would meet the bombers near Aitape, beat off pursuing fighters, and shepherd them home. Medium and light bombers would continue attacks on the airfields at Wewak to prevent their use by Japanese fighters. The Liberators with their P-38 and P-47 escorts would smash the anti-aircraft defenses while the medium and light bombers would drench the area with bombs.

On March 30th, 7 B-24’s hit Hollandia dispersals as 75 Liberators of the 43rd bombardment group and 59 P-38s of the 80th, 431st and 432nd Fighter Squadrons swept over Hollandia’s airstrips and dropped nearly 6000 bombs. To make matters worse for the Japanese, they suffered from insufficient radar warning, many of their aircraft would be on the ground refueling after some morning patrols. The 5th Air Force found countless enemy aircraft parked wing tip to wing tip along the runways, a lethargic anti-aircraft reaction. 25 or more fighters made "eager" passes against the 65th Bombardment Squadron, whose gunners claimed two destroyed. The 80th Fighter Squadron engaged a reported 35 to 40 hostile fighters, destroying 7 of them. The 431st Fighter Squadron claimed one Tony damaged, but the 432d encountered no enemy fighters. Japanese interception seemed badly disorganized. The planes milled about with little evident formation, and most of the pilots appeared to have little desire for a fight. Over 100 aircraft were destroyed as the Japanese were caught completely unprepared.

Japanese prisoners-of-war and captured documents later revealed that the reason the bombing operation was so successful was because the Japanese high command erroneously transported too many airplanes to Hollandia from the Philippines and the Dutch East Indies but did not transport more pilots and maintenance crews with the airplanes. There was no way for them to build appropriate defensive shelters to protect all 400 aircraft and also there were not enough trained pilots who could fly all of those airplanes at the same time so many perfectly operational aircraft were left sitting there with no aircrew to maintain them. The morale at Hollandia airbase was very low during the bombing operation, with many Japanese soldiers and airmen hiding in bunkers instead of manning anti-aircraft artillery and getting airplanes into the air. Most of these Hollandia soldiers and airmen were rear-echelon and not combat-oriented at all because most of the combat-trained divisions from the 18th Army were recently sent further east towards Wewak in anticipation of amphibious landings that would never come thanks to the deception and feints carried out by General Kenney. The P-38s then withdrew to Nadzab as soon as the bombers cleared their targets; and the P-47s, meeting the Liberators near Aitape, convoyed them home without incident. So successful was this first raid that one squadron reported that “Hollandia had really been Wewaked”.

The next day, Kenney launched a nearly identical mission, with 7 Liberators and 52 P-38s bombing the dispersal at Hollandia, Cyclops and Sentani airdromes. 153 tons of 100 pound demos, frags and incendiary bombs were dropped. The Japanese anti-aircraft fire was more accurate this time around and 56 Japanese fighters gave the allies a fight. However the pilots were inexperienced and unaggressive. The Americans estimated 14 aircraft were shot down while they suffered the loss of one P-38. After the air strike, the total number of destroyed aircraft on the ground reached 199. At this point the Japanese scrambled to withdraw their remaining serviceable aircraft out of Hollandia.

On April 3, Kenney sent his heaviest air attack to date. 66 B-24s escorted by 21 P-38s dropped 492 1000-pound bombs on anti-aircraft defenses. An estimated 30 Japanese Tonys and Oscars attempted without success to break up the bomb runs, and B-24 gunners claimed 2 fighters destroyed, while the 21 escorting P-38's of the 80th Squadron claimed downing ten. Then, 96 A-20s escorted by 17 P-38s strafed and dropped 100-pound para-demolition bombs over grounded aircraft, stores, and other targets of opportunity. The 432nd Squadron, covering the A-20's with 17 P-38's, encountered about 20 Japanese fighters and claimed 12 definitely destroyed, against the loss of one P-38. Finally, 76 B-25s escorted by 36 P-38s swept the strips at noon, scattering parafrags and parademos and strafing everything in sight. Only 3 Japanese fighters were encountered in this last attack, which were all shot down. After the end of the raid, Hollandia was so badly mauled that it could no longer be considered a major air installation. A Japanese seaman after hearing of the Allied mission of April 3rd against Hollandia, although seemingly confused as to imperial folklore, correctly assessed the Allied victory: "Yesterday, the anniversary of the birthday of Emperor Meiji, we received from the enemy, greetings, which amount to the annihilation of our Army Air Force in New Guinea." After April 3rd, the 5th Air Force virtually owned the air over Hollandia.

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The Admiralty Islands campaign was coming to a swift close, seeing MacArthur secure the valuable islands like Los Negros and Manus. MacArthurs new campaign to hit Western New Guinea and the Dutch East Indies, certainly began with a bang as General Kenney’s air forces had basically claimed air supremacy, the Japanese were in full panic mode.