- 148 - Pacific War Podcast - Battles of Peleliu and Angaur 18 - September 26 - , 1944

The Pacific War - week by week

Last time we spoke about the invasion of the Palau Islands. General Rupertus’s 1st Marine Division was tasked with attacking Peleliu, while General Mueller’s 81st Division would land on Angaur. Prior to the landings, extensive neutralization of Japanese airfields was carried out by Allied forces. On September 6, carrier-based aircraft attacked the Palaus, significantly damaging enemy targets but encountering minimal resistance. The invasion fleet, led by Admiral Fort, began landing operations on September 15. Despite strong Japanese defenses, especially around Peleliu’s rugged coral ridges, the Marines made some progress but faced intense resistance. Notable figures such as Eugene Sledge, author of “With the Old Breed,” provided personal insights into the brutal conditions faced. The landing saw heavy casualties and challenges, including ineffective pre-landing bombardments and fierce counterattacks, but the Marines managed to secure key positions by the end of the first day. The 81st Division then proceeded with landings on Angaur on September 17, facing lighter resistance but difficult terrain.

This episode is the Battles of Peleliu and Angaur

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 left off, Peleliu and Anguar had just been amphibiously assaulted by US Marines. While the landings on Angaur were underway, General Rupertus pressed on with the Peleliu offensive on September 17. In the southern sector, Colonel Hanneken’s 7th Marines made headway against the isolated Japanese defenders. The 3rd Battalion cleared a minefield and captured the southeast promontory, while the 1st Battalion took on the southwestern promontory but only managed to secure half of it due to fierce enemy resistance. To the north, the 1st and 5th Marines advanced further, encountering the Umurbrogol Mountains for the first time, where Colonel Nakagawa had fortified his defenses. On the left flank, Colonel Puller’s 1st and 3rd Battalions encountered minimal opposition as they moved along the relatively flat coastal plain but had to halt their advance when the 1st Battalion was impeded by a reinforced concrete blockhouse. On the right, Colonel Harris’ 2nd Battalion progressed well while staying hidden from Japanese artillery and mortar fire. However, despite reaching their objectives by mid-morning, Harris’ 1st Battalion faced difficulty when Puller’s 2nd Battalion, after making initial gains, was halted by the Umurbrogol defenses. They fought hard to secure Hill 200 but were immediately met with fire from the next ridge. Additionally, Harris’ 3rd Battalion was pinned down by heavy flanking fire from the left. That night, additional armor was sent to the 7th Marines to support the ongoing operations in the south. The next morning, Hanneken’s 3rd Battalion launched a final assault. During the night of D+2, additional armor (tanks and 75mm gun-mounted halftracks) was brought up and at 10:00 on September 18 the advance was resumed. Again progress was painfully slow with many reserve elements being attacked by Japanese from bypassed caves and underground emplacements. At 13:44 elements of Companies A and C reached the southern shores, though the area being assaulted by Company B was still heavily defended. Tank support had withdrawn to re-arm and before Company B was in a position to resume the attack, a bulldozer was needed to extricate the gun-mounted half-tracks, which had become bogged down. At that time, several explosions were heard from the Japanese defenses and it was found that remaining Japanese defenders had finished the job for the Marines. The final handful leaped from the cliff tops into the sea in an effort to escape, only to be picked off by Marine riflemen. With the taking of the two promontories, the southern part of Peleliu was secured. 1/7 and 3/7 squared themselves away for a well-earned rest, while headquarters reported "1520 hours D+3, 7th Marines mission on Peleliu completed." Unfortunately, this was not quite the case. Despite the slow progress and intense Japanese resistance, the Marines managed to secure the southern portion of Peleliu by the end of September 18.

At the same time, the 1st and 5th Marines continued their fierce and costly push north. On the right flank, Colonel Harris’s 2nd Battalion faced only sporadic resistance as it cut through the dense jungle. The Americans eventually reached a causeway leading east to Peleliu’s northeastern peninsula, a potentially dangerous obstacle to their advance. After a successful patrol, Harris opted to call in an airstrike before crossing, but the strike missed its target and hit the area while the Marines were crossing. Despite this, the bridgehead was established, though further casualties were incurred due to friendly artillery and mortar fire. With this new foothold, Harris redirected his 3rd Battalion eastward across the causeway to support the 2nd Battalion’s advance. On the left flank, the 1st Marines, having sustained 1,236 casualties, were urged by Rupertus to "maintain the momentum." This led Colonel Puller to commit all available reserves, including engineers, support personnel, and Hanneken’s reserve 2nd Battalion. The 1st Marines suffered about 240 casualties during the 17th and in Japanese counterattacks the ensuing night; the 3rd Battalion was reduced to about one third of its original strength; and two companies of the 1st Battalion were practically finished as fighting units. On the other hand, there was some reason for optimism. Progress on the 17th had been measured in hundreds of yards in the rough, high ground at the southern end of the central ridges and strong Japanese resistance had been overcome. Whatever optimism may have existed was not to last too long. On the 18th, in what the Marine Corps' history of the operation characterizes as "savage and costly fighting," elements of the 1st and 7th Marines managed to advance more than 500 yards in the center, principally along the ridge lines and hills oriented north and south. But the advance during the day was held up at a group of peaks which seemed at first to form a continuous ridge line that was oriented more east and west than the rest of the Peleliu ridges. Soon, the name Five Sisters came to be applied to a cluster of peaks forming the western side of the terrain feature. A towering hill at its eastern extremity, separated from Five Sisters by a saddle, was designated Hill 300, or Old Baldy. With the 7th Marines held up in the center, at Five Sisters, the units on both sides of the central ridges halted so as not to create exposed flanks. Puller’s 3rd Battalion made progress along the coastal plains but had to pause to stay in contact with other units. Meanwhile, the 2nd Battalion struggled against the Umurbrogol Mountains, capturing Hill 210 before being forced to withdraw due to a fierce Japanese counterattack on Hill 200 behind them. At Anguar, following a three-hour artillery bombardment supported by aircraft, General Mueller’s 321st and 322nd Regiments resumed their advance north and west with tank support. After linking their advances, Colonel Venable pushed west and reached the high ground where Major Goto had established his main defenses, while Colonel Dark made significant progress south until his forces encountered the formidable defenses at Green Beach.

The night of 18-19 September was noisy and nerve-racking all along the front and few troops got much sleep. Minor Japanese attacks harassed the exposed salient held by the 3d Battalion, 322d Infantry, while bats and large land crabs helped the Japanese to create distraction and started troops firing on nonexistent enemy infiltrators. Apparently no casualties resulted either from Japanese action or indiscriminate small arms fire. Friendly artillery fire did, however, cause some casualties. About 2030, four or five 105-mm. shells from the 316th Field Artillery Battalion hit the lines of the 2d Battalion, 321st Infantry, killing 4 men and wounding 15 others. The artillery fire was stopped before further damage could be done.

On September 19, following a night of numerous Japanese infiltrations and small-scale counterattacks, the 322nd Regiment swiftly secured Saipan Town and advanced to the north shore of Garangaoi Cove. Meanwhile, the 321st Regiment successfully attacked and captured the Green Beach fortifications from their vulnerable side. To manage the exposed Japanese forces on the beaches, Dark’s 2nd Battalion, supported by tanks, maneuvered left and progressed down the southwest of the island, halting just short of the shoreline by nightfall. At Peleliu, Harris’ Marines made headway towards the Ngardololok area, overcoming light resistance and quickly dispatching the few enemy stragglers they encountered, reaching Purple Beach by day's end. However, in front of the O-3 line, Puller’s weary troops, having endured a grueling night of Japanese counterattacks, resumed their assault on the Umurbrogol Mountains.

Despite some local advances, by evening on 20 September the 1st Marines had been stopped and, ". . . as an assault unit on the regimental level, had ceased temporarily to exist," having suffered almost 1,750 casualties, well over half its strength. Relief was absolutely necessary, not only because casualties were heavy but also because the survivors were physically exhausted from heat, lack of water, and continuous combat. Elements of the 7th Marines therefore relieved all 1st Marines units except those along West Road. While the 7th Marines took over from the exhausted 1st Marines on the right, the 5th Marines continued their advance through western Peleliu, securing its two peninsulas, including Island A and Ngabad Island, by September 21. General Mueller, concerned lest the Japanese reported on the south break through gaps or weak points in the forward lines, had special defenses in depth set up at RED and BLUE Beaches, utilizing Shore Party and antiaircraft troops. All units were alerted to expect Japanese attacks during the night. The division expected (and perhaps hoped) that the Japanese still believed to be located in southern Angaur might launch a suicidal desperation charge during the night or at dawn on the 20th. The night proved very quiet until, toward morning, some small, scattered Japanese parties infiltrated through the lines of both regiments. There was no banzai effort--rather, these Japanese troops were apparently attempting to escape to the northwest hill mass from positions in the mangrove swamp and GREEN Beach 3 areas. Action at dawn was limited to a mopping-up operation directed against four Japanese discovered in the headquarters area of the 2d Battalion, 321st Infantry. By 11:00 on September 20, Mueller reported to General Geiger that all organized resistance on Angaur had ended and that the island was secure.

General Mueller's statement was probably prompted by his realization that the remaining Japanese were compressed into the northwest hills and by the reports that about 850 of the enemy had been killed through the 20th. This casualty figure was an overestimation. Probably fewer than 600 Japanese had been killed through the 20th, and Major Goto still had possibly 750 men with which to conduct an organized defense in the northwest. On orders from General Inoue, Goto planned no final banzai attack which would decimate his forces. Instead he withdrew over half his force to rugged terrain and emplaced them in natural or prepared fortifications. His lines of defense in the northwest were well conceived; many of his positions were mutually supporting; the amphitheater configuration of the bowl provided him with defensive areas whence heavy cross fires could be directed at attackers; the broken coral, with its crevices, fissures, caves, and ridgelets, gave him defensive advantages at least as good as those at the Ibdi Pocket on Biak; and he had available a number of artillery and anti-tank weapons, heavy and light mortars, and heavy and light machine-guns, most of them so emplaced as to give maximum support to his riflemen. In addition, he could still exercise effective control over the men he had gathered in the Lake Salome bowl. For whatever it was worth, Goto was ready to conduct a protracted defense, though the best he could hope for was to tie down the 322nd Regiment. Nevertheless, the real issue at Angaur--securing the prospective airfield area--had already been decided.

To the north, while southern Angaur was being secured, Venable’s men were probing the enemy's northwestern defenses with a series of company-sized attacks. These attacks allowed the Americans to gather crucial information about Goto’s remaining positions, centered around the Lake Salome bowl. Venable discovered that organized resistance was still strong, prompting him to rearrange his units for a final push. Following a heavy artillery and air bombardment, the 322nd Regiment attacked the bowl with tank support, initially making some gains but soon encountering obstacles due to the terrain and enemy fire. By the end of September 21, Venable deemed the newly gained positions too exposed and decided to withdraw to the previous night's defenses. Meanwhile, the 1st and 7th Marines continued to face heavy casualties as they fought through the Umurbrogol Mountains, with the latter advancing less than 175 yards after two days of intense combat. Nakagawa’s fierce defenders managed to halt the 1st Marine Division on the rough and well-defended terrain, resulting in a total of 4,000 casualties by this time. After visiting the front, Geiger decided to replace the battered 1st Marines with Dark’s 321st Regiment, which had suffered minimal casualties and had completed its mission at Angaur. The 1st Marines by this time reported 1749 casualties. One Marine later described the fighting in the Umurbrogol, which attests to the level to which the 1st Marines had deteriorated: "I picked up the rifle of a dead Marine and I went up the hill; I remember no more than a few yards of scarred hillside, I didn't worry about death anymore, I had resigned from the human race. I crawled and scrambled forward and lay still without any feeling towards any human thing. In the next foxhole was a rifleman. He peered at me through red and painful eyes. I didn't care about him and he didn't care about me. As a fighting unit, the 1st Marines was finished. We were no longer human beings, I fired at anything that moved in front of me, friend or foe. I had no friends, I just wanted to kill."

OnSeptember 19, he also dispatched Colonel Arthur Watson's reserve 323rd Regiment to secure Ulithi Atoll. After a successful reconnaissance mission, the infantrymen landed on September 22, discovering that the atoll’s airfield and seaplane base had been abandoned by the Japanese. The Americans later established a major advanced fleet anchorage, a Marine airbase, and a Navy seaplane base there. Ulithi Atoll contained a 300-berth anchorage and a seaplane base. Occupation of these Western Caroline islands provided still another base from which future operations against the enemy could be supported. The construction of an airstrip on Ameliorate Island made possible fighter plane protection for the anchorage and afforded a base from which US aircraft could continue neutralization of the nearby Japanese bases on Yap. Together with Angaur and Peleliu Islands to the southwest and Guam, Tinian, and Saipan to the northeast, the capture of Ulithi Atoll completed a line of American bases that isolated Japanese holdings in the Central and South Pacific. The occupation of Ulithi Atoll further denied it to the enemy as a fleet anchorage, weather and radio station, and possible air and submarine base, in addition to precluding its use by the enemy to observe and report the activities of American forces in the sector. By September 25 the unloading of all the support ships had been completed and Vice Admiral John H. Hoover, Commander, Forward Areas Western Pacific, took over the task of developing Ulithi Atoll into an advanced fleet base. Within a month after its capture, more than 100 Navy craft from self-propelled types to lighters, floating drydocks, barges, landing craft, and seaplane wrecking derricks were en route to the island. During subsequent operations in the Philippines, the Pacific Fleet found Ulithi to be an extremely valuable base. Prior to the invasion of Okinawa, the island served as a staging area for fleet and amphibious forces. The atoll thus fulfilled a vital strategic role in the final phase of the Pacific War.

On that day, Venable resumed his assault on the Lake Salome bowl. The coastal offensive faced little resistance, but the attack through the southern defile encountered heavy enemy fire. Despite this, the troops reached the shores of Lake Salome. However, Venable was severely wounded during the action and had to be evacuated, with his troops retreating to more defensible positions by nightfall. The main strength of the attack was placed on the right (southeast) section of the bowl, and tanks fired along the eastern rim about 200 yards in front of the leading elements. The mediums had been undisturbed by enemy fire all morning, but, apparently attracted by an incautious grouping of officers and men near the lead tanks and defile exit, a Japanese anti-tank gun opened fire from a hidden emplacement along the east rim. Three officers (including Colonel Venable, who was in the forward area to observe the new attack) and one enlisted man were severely wounded and had to be evacuated. During the retirement on the 22nd, one of the three forward tanks was so badly damaged by a mine or buried shell that it could not be moved through the defile. This tank blocked the defile's northern entrance and prevented the withdrawal of another medium, which had to be destroyed to keep it from falling into Japanese hands. In four days of fruitless effort to push into the bowl from the south, three tanks and two 75-mm SPM's had been lost. Heavier infantry losses also began to be sustained now that the Japanese, cornered, were fighting to the death. On that day, for instance, the 2nd Battalion lost 2 men killed and about 35 wounded.

At 0730 on the morning of the 23d, the 2d Battalion, with Companies B, C, and E attached, continued the attack into the bowl from the south. Companies B and C worked up the east shore of Lake Salome. Companies I and G pushed toward the southwest and western shores, while Company F paid particular attention to caves along the southwest rim of the bowl. During the first part of the attack all companies moved forward rapidly, and Company I reached the northwest corner of the lake without much trouble. But Company B, pushing forward against increasingly heavy Japanese fire from the north, was pinned down by this fire when it reached the northeast corner of the lake. Company C was sent north on B's right to try to outflank the enemy machine gun and mortar positions from which the fire on Company B originated. The intention was to flush the Japanese from their positions and push them southwest and south against the main body of the 2d Battalion. But Company C could make little progress toward the northern section of the bowl, and its own position became precarious as Japanese mortar and machine gun fire increased and the 1st Battalion's own 81-mm. mortar ammunition ran out, making further mortar support impossible. Japanese fire continued to increase and the positions of all forward companies became untenable. A general withdrawal to the defile entrance was ordered. The withdrawal was painfully slow; companies were broken up; all units suffered more casualties. One small group of Company I, separated from its parent unit, worked over the cliffs and ridges at the bowl's western rim to the coast at BLACK Beach. Company B, retreating in small segments, lost men as it withdrew from the northeast corner of the lake. All told, the 2d Battalion and attached companies lost 18 men killed and over 75 wounded during the day.

Concurrently, as the 1st and 7th Marines continued to struggle with the formidable Umurbrogol Mountains, Harris’ Company G successfully secured the undefended Carlson Island, finally completing the 5th Marines' original mission. Despite concerns about a potential enemy attack on Koror and Babelthuap after the Peleliu operation, General Inoue decided to reinforce Nakagawa’s beleaguered garrison. By 21 September effective Japanese infantry strength in the central ridges was down to 1,300 men. That, of course, does not paint a true picture of the situation in the central pocket. A trained soldier, well armed, can be tenacious on the defense in such terrain as the central ridges of Peleliu whether or not he be trained for infantry service. There were probably 4,000 Japanese troops (including the 1,300 infantrymen) still firmly ensconced in the central pocket as of 21 September, and there were at least 1,000 more troops in the Amiangal Mountain area at northern Peleliu. Nevertheless, Colonel Nakagawa, commanding the Peleliu Sector Unit, clearly needed reinforcements if he was to hold out much longer. There were perhaps 30,000 Japanese troops in the northern Palaus to draw from, including two battalions of the 59th Infantry, two battalions of the 15th Infantry, and four or five recently organized infantry battalions of the 53d Independent Mixed Brigade.

The Japanese were not to reach their destination undetected. At 0535, the destroyer H.L. Edwards spotted seven enemy barges about 1,000 yards northeast of Akarakoro Point at the northern tip of Peleliu, obviously headed for the island. The destroyer opened fire, sinking one barge before the remainder reached the beach. A combination of bombing and strafing, naval gunfire, and artillery hit the barges on the beach, and by 0845 the cruiser Louisville reported all barges destroyed. The enemy version of this incident agrees only in part with the American account, adding that "despite receiving severe enemy air and artillery fire at a point two kilometers off the coast, they made a successful landing at 0520 hours under the command of 1st Lieutenant Murahori".

Knowing that some Japanese forces had reached Peleliu, Rupertus decided to deploy his own reinforcements between the central ridges and the western shore, targeting the enemy's weak spot for an offensive up the western coast. The 7th Marines supported the Army by attacking enemy positions from the south and center, with Hanneken’s 3rd Battalion advancing along the high ground to the right rear of the 321st. After relieving the 1st Marines, Dark sent patrols up the coastal flat to Garekoru, encountering little opposition initially. However, Dark’s 2nd Battalion faced heavier resistance in the afternoon and had to retreat, postponing the northward advance until the next day. During the night, Inoue sent the remainder of the 2nd Battalion, 15th Regiment, and despite being shelled, most reinforcements reached Peleliu. By September 23, the Americans had secured important footholds on Peleliu and Angaur. However, intense fighting remained, with the 321st Regiment relieving the 1st Marines against Nakagawa’s fortified positions, while the 322nd Regiment continued to attack Goto’s defenses on the northwest hills. Yet that is it for the Palau’s as we now need to turn to Mortai.

General Persons’ troops quickly secured and expanded the island perimeter, successfully repelling the enemy's night raids with little difficulty. An example of these raids is the September 18 attack. This is the Japanese report: “On 18 September the main body of the 2nd Provisional Raiding Unit, which had moved into position along the upper Tjao, launched a strong night infiltration attack with the objective of disrupting the enemy's rear area in the vicinity of Doroeba and Gotalalmo. Although deep penetration of the enemy lines was achieved and considerable casualties inflicted, the attack failed to reduce the beachhead or to interfere with the enemy's rapid preparation of Doroeba airfield.” In truth, the Americans easily repelled this attack, suffering very few casualties. These raids would continue throughout September and October.

American engineers were busy constructing a new fighter strip at the Pitoe Drome area. This strip was scheduled to be ready for use by September 29 but was eventually abandoned and downgraded to an emergency field. A number of factors influenced the decision to abandon the site, which was renamed Pitoe Crash Strip. Japanese air reaction had been so ineffectual that the need for a fighter base on Morotai was not as urgent as had been expected. Aircraft based on escort carriers, some of which remained in the Morotai area for weeks, were able to keep away most of the Japanese planes, and their efforts were supplemented by long-range land-based fighters from Sansapor. Moreover, the line of approach which planes had to use to land on Pitoe Crash Strip interfered with that of the more important bomber base at Wama Drome. Finally, the terrain at the crash strip was by no means as well drained as that at other locations on the Doroeba Plain, and it was necessary to expend much engineer effort to keep the strip operational.

The new field, which acquired the designation Pitoe Drome, was located about 1,200 yards north of Wama Drome. Construction proceeded slowly at Pitoe Drome because so much engineer effort had to be devoted to the completion of Wama Drome. By 4 October almost 7,000 feet at the new site had been cleared, but it was not until the 17th, D plus 32, that even one runway was surfaced, let alone taxiways and dispersal lanes. Meanwhile, the construction of a new bomber field at Wama Drome faced significant delays due to heavy rainstorms and a shortage of suitable surfacing material. Despite almost constant struggles with soggy ground and tropical downpours, engineers managed to make 4,000 feet of Wama Drome operational by October 4. However, the overall progress on building Morotai’s new airbase, intended for the upcoming invasion of the Philippines, was slower than anticipated. Nevertheless, the Tradewind Task Force was disbanded on September 25, as the island was considered secure enough. General Hall then assumed command of the Morotai base as the commander of the 11th Corps. However, unbeknownst to the Americans, who believed the only possible Japanese response to the invasion was the ineffective air raids already carried out against them, troops in Halmahera were preparing to embark on a dangerous mission to reinforce Morotai and contest control of this key island.

In the meantime, after the successful invasion of the Palaus, new developments were unfolding on the Philippines front following Admiral Mitscher’s Task Force 38's recent successful strikes. These strikes had revealed an unexpected vulnerability in the enemy's air defenses, prompting Admirals Halsey and Nimitz to cancel the Yap operation, thereby freeing up many resources for the Philippines Campaign. Approximately 500 aircraft, or about 57% of the 884 believed to be in the Philippines, were rendered nonoperational or destroyed during these air attacks. Consequently, General MacArthur decided to cancel the preliminary Mindanao operations and instead make a direct jump from the Palaus-Morotai line to Leyte on October 20. Shortly after this change in schedule, MacArthur informed the Joint Chiefs that he could advance from Leyte to Luzon by December 20, two months earlier than planned. Meanwhile, the carrier raids on Mindanao and the Visayas strengthened the Southern Army command's belief that the Allies were preparing for an early invasion of the Philippines. As a result, Marshal Terauchi recommended accelerating the reinforcement of the Philippines, activating Operation Sho-Go, and authorizing the 4th Air Army to employ its main strength against enemy carrier task forces. This was in contrast to the current policy of not committing available air strength against enemy raiders, which was failing to conserve Japanese air power for a decisive battle. However, Tokyo denied these last two requests while also receiving concerning reports about General Kuroda’s neglect of his duties as field army commander. In the middle of September, IGHQ decided to replace General Kuroda with General Yamashita. Not only did General Kuroda have a concept of the Philippine operations that differed from that of his superiors, but he was charged with neglecting his duty as field army commander. Lt. Col. Yoshie Seiichi of the Personnel Bureau of the War Ministry, who had been sent to the Philippines to investigate personnel matters in the Southern Army, said of the incident: “Stories reached the War Ministry that Lt. Gen. Kuroda was devoting more time to his golf, reading and personal matters than to the execution of his official duties. It appeared that his control over staff officers and troops was not sufficiently strong and that there was a good deal of unfavorable criticism of his conduct among the troops. There were also indications that discipline was becoming very lax. On September 4, I left Tokyo under orders . . . to investigate. As a result I obtained many statements substantiating the unfavorable stories in regard to Lt. Gen. Kuroda. The recommendations of all the staff was that Lt. Gen. Kuroda be relieved as soon as possible, and be replaced by Gen. Yamashita . . . who was a superb tactician and excellent leader.” Random note, for those interested, over on my personal podcast at the Pacific War Channel I did a single episode covering how Yamashita became the Tiger of Malaya and plan to do more pieces on him as I find him to be one of the more interesting generals of the Pacific War.

Before an effective change in command could take place, the Japanese were about to experience a more dramatic display of Allied offensive power that they would soon encounter in the Philippines. On September 18, Mitscher’s Task Force 38 was ordered to head back toward the islands for a major strike against Luzon, the heart of Japanese control in the Philippines. The American carriers achieved complete surprise and successfully attacked Luzon three days later. Despite the fierce defense by approximately 42 Zeros, between 09:30 and 18:00 on September 21, four waves of over 400 aircraft targeted the harbor area and airfields around Manila with bombs and strafing runs. The assault on the harbor and shipping along the west coast resulted in the sinking or severe damage of 34 vessels totaling over 100,000 gross tons, while the raids on the airfields inflicted significant damage on grounded aircraft. At 0610 the following day, 22 September, search planes discovered the enemy carrier groups still lurking off the coast of Luzon, and at 0730 a hit-and-run attack was carried out by 27 Japanese aircraft, with reported bomb hits on two carriers and one cruiser. Naval air units at Legaspi attempted to carry out a second attack on the enemy carriers during the late afternoon, but the attack force of 19 planes failed to locate the carrier groups. Following the failed Japanese hit-and-run counterattack, Mitscher continued his assaults on Manila, destroying an estimated 110 aircraft in the air and 95 on the ground, and sinking or damaging 44 vessels. After the apparent withdrawal of enemy carriers, the Japanese decided to relocate their remaining ships in Manila Bay to other anchorages, many of which were directed to the secure docks of Coron Bay. However, Mitscher’s carriers returned on September 24 to launch further strikes against Luzon, including a raid by about 96 Hellcats and 24 Helldivers on Coron Bay, which resulted in the sinking or damaging of 10 more vessels. Additional attacks on other targets led to the sinking or damaging of 12 more ships.

Despite the ongoing air attacks, the Imperial Japanese Navy still deemed it premature to fully activate Operation Sho-Go, believing the decisive battle would take place in or after late October. Meanwhile, the Imperial Japanese Army accelerated its preparations to defend the Philippines. The reserve 1st Division was ordered to move to the islands immediately, and plans were made to assign ten surface raiding regiments to the area. On September 26, as plans for air reinforcement to the Philippines were being approved, General Yamashita was confirmed as the new commander of the 14th Area Army. He arrived in the Philippines on October 6 and found the situation "unsatisfactory," with poor planning for the Leyte campaign and many of his staff unfamiliar with the conditions in the Philippines. Lt. Gen. Makino Shiro, now commanding the 16th Division, which was the major force on Leyte, had directed his efforts since April 1944 toward the construction of defensive positions on the island. The first line of defense, which was on the east coast in the Dulag area, was practically completed by the middle of October. The third defensive line was in the middle of Leyte Valley in the vicinity of Dagami. The second line of defense was between the two others, while the bulk of supplies was assembled in the central mountain range at Jaro. The distribution of the other troops at the time of the American landings was as follows: one battalion of the 9th Infantry Regiment in the Catmon Hill and Tanauan district, and the main strength of the 33d Infantry Regiment in the Palo and Tacloban area. The larger part of the 33d Infantry Regiment, which was less adequately trained than the other regiments, had arrived on Leyte in mid-September from Luzon. Its officers were unfamiliar with the terrain and did not fortify their positions.

However, the supply situation was favorable, with Manila serving as the main Japanese depot in the region. Following established plans, he instructed his subordinates that the Area Army would "seek decisive battle on Luzon" while in the central and southern Philippines, the focus would be to delay the enemy's advance and prevent them from securing naval and air bases. However, the September air strikes had led to a noticeable increase in guerrilla activity and civil disorder due to widespread destruction and panic. Small Japanese garrisons were attacked, pro-Japanese Filipinos molested and intimidated, and communications disrupted. In central Luzon there were indications that some guerrilla units were planning a move to the Lamon Bay area in order to be the first to cooperate with an American landing force, and on Negros and Panay guerrilla raids on Japanese airfields became boldly persistent. The Fourteenth Area Army feared that, as soon as enemy forces landed, the guerrillas would not only give them direct assistance as scouts and guides, but seriously hamper Japanese operations by attacking rear communication lines. Consequently, martial law was declared across the archipelago in anticipation of enemy landings.

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Despite fierce and costly combat, American forces made significant advances in the Palaus, securing critical islands and establishing bases. The battle for Peleliu was marked by high casualties and intense fighting, with heavy losses on both sides. The successful capture of strategic locations like Ulithi Atoll and the subsequent strikes on Luzon further demonstrated Allied dominance and strategic planning in the Pacific Theater.