- 188 - Pacific War Podcast - Liberation of Luzon - June 24 - July 1, 1945

Last time we spoke about the victory at Okinawa.. As American forces led by General Buckner advanced, they captured strategic key points, driving the Japanese into a desperate retreat. Despite overwhelming odds, the remaining Japanese defenders, embodying the samurai spirit, fought to the bitter end, hoping to gain time for their homeland's defenses. On June 21, faced with inevitable defeat, Generals Ushijima and Cho chose to commit seppuku in honor of their duty. Their tragic decision underscored the deep commitment to their cause, an adherence to the warrior code. By this point, countless Japanese soldiers surrendered, acknowledging the futility of their fight. As the month drew to a close, the Americans secured Okinawa, a hard-won victory shadowed by staggering casualties, more than 107,000 Japanese lives lost and significant American losses. This battle not only symbolized the relentless spirit of those who fought but also the tragic costs of war, forever etched in history as a vivid reminder of sacrifice and the haunting price of conflict.

This episode is Liberation of Luzon

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 most, the battle of Okinawa basically ends the Pacific War, but the truth is the war was raging all over the place. The second most noticeable place would be Luzon, where the remnants of General Yamashit’as 14th Area Army were still resisting in the northern and eastern mountain ranges. Yet here too, the curtains were beginning to fall.

As we last left off, it was mid-April 1945, and the fierce struggle for the liberation of Luzon was reaching a critical phase. General Eichelberger’s 8th Army was actively engaged in offensives across the Visayas and Mindanao, while General Krueger’s 6th Army focused its might on two primary sectors in Luzon. The stakes were high, the liberation of Luzon was crucial for securing Manila and restoring the Filipino government that had been disrupted by the war. In the northern sector, General Swift’s 1st Corps was grappling with General Yamashita’s formidable Shobu Group, who were entrenched in this mountainous terrain, making the fighting particularly arduous. Meanwhile, General Hall’s 11th Corps was applying relentless pressure on the opposing Shimbu Group, led by General Yokoyama, in the vital areas east of Manila. Starting in the northern reaches of Luzon, we find General Clarkson’s 33rd Division making tangible advances, having secured Route 11 up to Camp 3, as well as segments of the Galiano Road and the Tuba Trail. This area, known for its treacherous paths and thick jungle, posed significant challenges, but the troops pressed on. Northward, General Beightler’s 37th Division was also on the move, with its 129th Regiment overcoming all enemy resistance along Route 9, reaching the critical town of Sablan by April 14. Not to be overlooked, Colonel Volckmann’s guerrilla 121st Regiment had carved a path up Route 4 to the strategically important Bessang Pass, known for its rugged terrain that offers a natural defense. General Mullins’ 25th Division was making notable progress towards Balete Pass, gaining crucial footholds on Crump Hill and Myoko Ridge. These positions were essential as they provided elevated vantage points over the surrounding valleys. On the western front, General Gill’s 32nd Division had successfully secured the western Salacsac Pass but still faced stiff enemy positions in the eastern pass, where Japanese forces were well-prepared to defend. With the arrival of the bulk of the 37th Division in early April, Swift was poised to launch a dynamic two-division drive towards Baguio, a city nestled in the mountains that had become a strategic goal due to its position and resources. While Clarkson’s units continued to engage in patrol actions in the Arboredo, Agno, and Ambayabang River valleys, there was limited progress in these areas. However, the 129th Regiment initiated a decisive attack on Sablan on April 11, successfully breaching Japanese defenses there by April 14. On that pivotal day, the 148th Regiment took charge of securing Route 9 through Calot, a vital corridor for advancing troops. Meanwhile, the 130th Regiment encountered fierce resistance as it pushed west of Asin along the Galiano Road, exemplifying the tenacity of Japanese forces determined to hold their ground.

As the battle raged, General Yamashita was already strategizing to evacuate Baguio. By April 19, he made the decision to relocate to the Bambang front, leaving Major-General Utsunomiya Naokata, one of his trusted chiefs of staff, in command of the remaining forces.  Despite the growing pressure on Route 9, the Japanese command seemed out of touch by the second week of April 1945. They inaccurately assessed that the primary thrust of General Swift's 1st Corps would come along Route 11, allowing them to become complacent. This misplaced confidence led to a failure to redeploy troops to counter the increasing threat on their right flank. Instead of fortifying their defenses, they appeared to adopt an inexplicable, almost defeatist attitude, unusual for a military as disciplined as the Imperial Japanese Army. Compounding this lack of urgency was the intense effort from the 14th Area Army headquarters to evacuate civilians and supplies from Baguio, a city perched high in the Cordillera Central mountain range. This evacuation served as a clear signal that the situation was deteriorating, yet the Japanese command remained strangely passive. Yamashita's mindset regarding the unfolding crisis was evident when he made personal preparations to depart for the Bambang front on April 19. In a move echoing his earlier strategy for the Bambang area, he established an independent command for the Baguio front before his departure. Utsunomiya's responsibilities also included nominal command over the 19th Division, stationed north of Baguio, but his control was hampered by significant communication difficulties that plagued the Japanese forces. The first notable action Utsunomiya took was to relieve the 58th Independent Mixed Brigade from the 23rd Division's control, seeking to streamline command. Under Yamashita’s directive to hold Baguio for as long as possible before retreating to a new defensive line, Utsunomiya issued an order for all troops along the existing Main Line of Resistance  "hold out to the last man." His tone betrayed the grim reality, coming across as almost ironic given the mounting pressures they faced.

Meanwhile, General Sato’s 58th Independent Mixed Brigade was frantically working to fortify defenses along Route 9, southeast of Calot. However, their efforts came too late to prevent the 148th Regiment from swiftly capturing Yagyagan on April 15, gaining a crucial foothold in the area. In response to this setback, Sato began sending reinforcements to the Irisan Gorge starting April 16, apparently under Utsunomiya's orders. This narrow, treacherous gorge, surrounded by steep cliffs, was seen as a pivotal point for a last-ditch defense. The Japanese troops managed to repel the initial assaults from the 148th Regiment on April 17, but as night fell, the Americans executed a series of enveloping maneuvers, ultimately securing Ridge A. The following morning, the 148th seized Ridge C; however, their frontal assaults against Ridge B were met with fierce resistance and ended in failure.

On April 19, the tide began to turn. After a devastating air strike and concentrated artillery fire that neutralized most of the Japanese positions on Ridge F, the Americans finally captured Ridge B. Concurrently, other American units seized Hills D and E, effectively cutting off the Japanese retreat route. The relentless pressure continued, and the next day, Ridges F and G were subjected to intense attacks, which ultimately resulted in their capture. This relentless campaign forced the Japanese to withdraw to Ridge H, where they continued to regroup. After heavy bombardment, the Irisan Gorge was finally cleared on April 21, sending the surviving defenders scrambling in retreat. As these operations unfolded, the 130th Regiment was busy repositioning two battalions from the Galiano Road to the junction of the Yagyagan Trail along Route 9, poised to mount a coordinated attack on Asin from both the east and west. On April 22, they launched their offensive, catching the Japanese defenders by surprise and effectively dismantling their defenses. By the afternoon of April 23, the Galiano Road was opened for American forces, marking a significant advancement in their campaign.

Concurrently, the 129th Regiment had taken over operations from the 148th Regiment and advanced against only scattered resistance, making significant progress as far southeast as the junction of the highway and the Galiano Road. However, their advance was ultimately halted due to concerns about a potential threat from the north. Seizing on this hesitation, General Utsunomiya decided to leave small delaying forces at Trinidad and Baguio, while initiating a general withdrawal to the north and northeast. With Utsunomiya's defensive lines weakened, American patrols were able to enter Baguio on April 24, met with surprisingly little resistance. By April 26, the 129th had effectively secured most of the city, facing only negligible opposition. Simultaneously, elements from the 123rd and 130th Regiments worked diligently to eliminate the remaining Japanese defenses on nearby Mount Calugong, along the Tuba Trail, and on Mount Mirador, ensuring the area was cleared for further American operations. Despite these American successes, Utsunomiya managed to escape with approximately 10,000 troops to the Baguio-Aritao supply road, a crucial evacuation route for Japanese forces. As the end of April approached and into the first days of May, the 37th Division continued to mop up the surrounding areas, further securing Trinidad. Meanwhile, the 33rd Division also pressed forward, capturing the Balinguay-Itogon-Pitican sector, enhancing their control over the region. Looking eastward, General Gill’s demoralized 32nd Division was still engaged in fierce fighting through the Salacsac Pass, hampered in their advance along the Villa Verde Trail. 

During the second week of April 1945, observers from the 6th Army headquarters reported alarming morale issues within the 32nd Division, echoing concerns that General Krueger had personally noted during previous visits to the front lines. The soldiers of the 126th and 128th Regiments were on the brink of complete mental and physical exhaustion. Front-line troops, many of whom had spent significant time overseas, were becoming overly cautious, possibly from the toll of constant combat. Conversations among the men frequently centered around one urgent topic: their rotation back to the United States. The once aggressive spirit characteristic of these combat troops was waning rapidly. With dwindling numbers and pervasive personnel issues, it was clear that the division would struggle to mount any spectacular gains in the coming days. If they couldn’t quicken their pace along the critical Villa Verde Trail, reaching their objective, Santa Fe, by the targeted date of June 1 appeared increasingly unlikely. Delays would be catastrophic; they risked being trapped on the trail by the heavy rains of the impending wet season, which typically began in late May. Such circumstances would severely hinder their ability to withdraw and salvage their equipment from the treacherous mountainous terrain. Meanwhile, the Japanese forces retained key terrain advantages, allowing them to economically utilize their troops and reinforce their front lines almost at will. In stark contrast, the rugged landscape severely restricted the 32nd Division’s maneuverability, forcing them to repeatedly launch costly frontal assaults with their diminishing strength. While terrain and weather conditions presented significant challenges, the growing personnel crisis loomed as a critical factor likely to further limit the division's progress in the days ahead. Compounding their challenges, General Iwanaka’s reconstituted 2nd Tank Division had suffered heavy casualties, leaving General Konuma unable to provide further reinforcements. On April 17, the rested 127th Regiment finally began its move to relieve the beleaguered 128th Regiment at the western pass, launching operations to clear the last remnants of Japanese forces from the Hill 506-507 area. Although Hill 506B fell rapidly on April 19, and Hill 507C was captured three days later, American forces struggled to completely clear Hill 507D until May 2, underscoring the tenacity of the Japanese defenders.

Despite the challenges, enough ground had been cleared by April 26 for the 2nd Battalion to initiate a drive east along and south of the Villa Verde Trail, aiming for the strategically important Hill 508. The Japanese forces, sensing this new threat, responded with fierce counterattacks from both the east and north, managing to delay the American capture of Hill 508 until April 29. The intense fighting illustrated the importance of this elevation, which offered vital visibility over the surrounding landscapes. In the days that followed, the 2nd Battalion expanded its control over Hill 508, establishing a defensive block on the Villa Verde Trail to the north while successfully repelling a series of heavy Japanese counterattacks. Meanwhile, the 3rd Battalion made significant strides by attacking and capturing Hill 509, further consolidating American positions in the area. Simultaneously, the 2nd Battalion of the 126th Regiment launched an offensive south from Hill 511, seizing Hill 515 on April 24. They advanced into the area north of Hill 508 while the 1st Battalion navigated through the rugged terrain of Hills 513 and 514, pressing southward to Hill 516. Their advance culminated in the capture of the crest of Hill 525, where they established a critical block on the Villa Verde Trail. However, the cost of these advances was significant. Due to the heavy losses incurred during these operations, the barely rested 128th Regiment began the process of relieving the exhausted 126th on May 3. Shortly after, the 128th's 2nd Battalion launched an assault southeast, successfully capturing Hill 526 on May 7, while some elements initiated a drive towards Hill 527. To the further east, General Mullins’ 25th Division was persistently pushing its Santa Fe offensive against stubborn Japanese resistance. In a stroke of fortune, a successful aerial reconnaissance mission revealed that ground located just 1,000 yards west of their position might offer a more favorable route of advance to Balete Ridge, providing a welcome alternative to the challenging Myoko mass itself.

On April 22, a reconnaissance force from the 27th Regiment successfully moved undetected to the southern slope of Balete Ridge, positioning themselves for a critical advance. The following day, the rest of the 2nd Battalion began to push toward Lone Tree Hill, while other units continued to exert pressure on the entrenched Japanese defenses at Myoko. Moving forward with enthusiasm and encountering negligible resistance, the Americans reached Lone Tree Hill on April 25, effectively bypassing the main concentrations of enemy forces. By April 27, the 2nd Battalion had advanced an impressive half mile beyond Lone Tree Hill, with its forward elements only three-quarters of a mile from Balete Pass. However, they were compelled to halt their advance due to the potential threat of an enemy counterattack looming on the horizon. Meanwhile, on April 23, the 35th Regiment began its ascent up Kapintalan Ridge, steadily making progress despite the challenging terrain. By April 27, their leading troops had reached a prominent knob located midway between Route 5 and Lone Tree Hill. The 161st Regiment was also making strides, continuing its attack northward towards Kembu Ridge, where they successfully secured Hill 4625 and the entirety of Highley Ridge by April 28. On that same day, the 27th Regiment began reinforcing their positions on Lone Tree Hill, while elements of the 2nd Battalion initiated a southwest push along Kapintalan Ridge to support the 35th Regiment advancing up Route 5. However, they encountered a formidable strongpoint and were only able to gain 350 yards of new ground northeast from the knob. Simultaneously, elements of the 27th Regiment advanced a modest 500 yards southwest by May 4, indicating the ongoing struggle. That morning, the 1st Battalion of the 161st Regiment seized the southeastern nose of Kembu Ridge, securing a valuable tactical position. At the same time, the 2nd Battalion pushed troops onto the ridge, extending their reach half a mile to the northwest, further consolidating American control in the area.

As a breakthrough appeared imminent, General Krueger began dispatching Beightler’s 37th Division to the Bambang front on May 2, with all elements of the division departing the Baguio area just three days later. With these reinforcements securing his rear and taking control of the Myoko massif, General Mullins ordered the 27th and 161st Regiments to concentrate their forces for a coordinated attack aimed at enveloping Balete Pass from both the east and west. On May 5, the 161st swiftly broke through Kembu Ridge and advanced to Haruna Ridge, while the 27th Regiment pushed west-northwest along Wolfhound Ridge. However, they faced fierce resistance, gaining only 350 yards against tenacious Japanese defenders. On May 8, Company I successfully launched a southwest offensive from their stronghold along a bare-crested ridge, while Company A deployed on Kenbu Ridge and began ascending the final sections of the Digdig River gorge. The following day, these two companies finally made contact with each other and linked up with the 161st on Haruna Ridge. By May 10, Wolfhound Ridge was secured, coinciding with elements of the 35th Regiment completing the clearance of Route 5 from Kapintalan to the pass. In the meantime, the 35th Regiment, along with units from the 27th, continued their assault on Kapintalan Ridge, which was ultimately secured by May 13. Meanwhile, the 148th Regiment renewed its attacks on Myoko Ridge, where Japanese resistance began to collapse by May 11. With these gains, Balete Pass was now secure. The Americans had incurred 565 men killed and 1,745 wounded during the drive, while General Okamoto’s 10th Division experienced catastrophic losses, with nearly 7,000 men killed and a complete breakdown of their control and communications.

Reflecting on the situation in Salacsac, by May 8, the Japanese position was deteriorating rapidly. In response, General Iwanaka made the critical decision to dispatch troops aimed at cutting the supply line to the 2nd Battalion of the 128th Regiment, with the intention of safeguarding his main stronghold at Mount Imugan. On that day, the 1st Battalion of the 128th Regiment began to push eastward, facing strong resistance, while elements of the 2nd Battalion moved west from Hill 526, struggling to make any significant progress. By May 10, Japanese forces successfully severed the track between Hills 525 and 516, forcing much of the 128th and one battalion of the 127th Regiment to allocate considerable resources to eliminate the Japanese pocket that had formed in that area. Meanwhile, the 33rd Division was left disheartened as it found itself assigned a holding mission to secure the Baguio-Bauang-San Fernando area. Their operations were limited to minor local gains and long-range reconnaissance, which did little to impact the overall situation. 

During May 1945, the only significant action undertaken by the 33rd Division took place along a trail connecting Santa Rosa in the Ambayabang Valley to Tebbo, located on the Agno River five miles south of Pitican. The division focused its efforts on clearing Japanese forces from the high ground situated between the main trail and the upper reaches of the Ambayabang Valley. On May 9, a battalion of the 130th Regiment advanced south from Baguio via Pitican and reached Tebbo, only to find the barrio abandoned. Meanwhile, on May 5, the 136th Regiment began its advance up the Ambayabang Valley. Approximately three miles south of Tebbo, they became embroiled in a ten-day battle, resulting in the deaths of a few hundred Japanese troops. However, these enemy forces posed little threat to the 33rd Division, their primary mission being to block American attacks toward the Baguio-Aritao supply road from the south. As the rainy season approached, 1st Corps and the 33rd Division had long since abandoned plans to use the valley as a route of advance against the Japanese supply lines. Consequently, the 136th Regiment relinquished the terrain it had gained along the valley and the trail to Tebbo almost immediately after capturing it. By May 15, all troops of the 33rd Division began their withdrawal, a challenging task compounded by heavy rains that had transformed the Pitican-Tebbo trail and the trails in the Ambayabang Valley into quagmires. The final destruction of the Japanese blocking force in the valley had little impact on the strategic plans or dispositions of 1st Corps or the Shobu Group, as the Japanese quickly replenished their outposts. By the end of May, the 33rd Division was left executing reconnaissance missions without significant enemy contact or major advances. The division remained in a state of restless anticipation, awaiting developments on the Bontoc and Bambang fronts before the 6th Army would authorize a new drive deeper into the rugged mountains of northern Luzon.

Turning to the north, the guerrilla 121st Regiment achieved a significant victory on April 21 by overrunning the last Japanese positions on Lamagan Ridge. About a week later, they completed their occupation of Lower Cadsu. However, during the first part of May, the 121st Regiment faced formidable challenges as they advanced over steep terrain against increasingly fortified Japanese defenses, bolstered by reinforcements from General Ozaki’s 19th Division. In the south, Hall’s 11th Corps made good progress throughout mid-April, successfully pushing General Yokoyama’s 41st Army, previously known as the Shimbu Group, further east from Manila. Concurrently, General Hurdis’ 6th Division continued its offensive against the Kobayashi Detachment at Wawa Dam, achieving a notable success by securing the crest of Mount Mataba on April 17, marking a significant tactical gain in the ongoing battle.

Despite General Hurdis’ hopes to swiftly advance against Mount Pacawagan and Wawa Dam, persistent personnel issues forced him to halt any offensive actions until the 145th Regiment could relieve the 20th Regiment in the Montalban area. The 145th eventually began its assault on Pacawagan on April 21. However, even with effective supporting fire that destroyed much of the enemy's defenses, American forces struggled to secure a foothold on the mountain until the end of the month. Meanwhile, the 1st and 63rd Regiments continued to hold their occupied ground until they were relieved late in April by the 151st and 152nd Regiments of General Chase’s 38th Division, which then officially assumed control of the offensive operations. In the southern part of Manila, significant water supply problems prompted General Hall to redeploy General Wing’s 43rd Division northward in preparation for an offensive against Ipo Dam. 

By mid-April 1945, an acute water shortage had developed within the city of Manila. General MacArthur informed General Krueger about the dire situation, noting that south of the Pasig River, Manila had access to no water sources except for that supplied by Army tank trucks and shallow, often contaminated wells. This shortage significantly hampered sewage disposal throughout the city, as water pressure from the overtaxed Novaliches Reservoir, the only reliable source was insufficient to carry off waste. As a result, flush toilets were frequently clogged, forcing many citizens to resort to using gutters and esteros for defecation. Restaurants and nightclubs, which were heavily frequented by off-duty American troops, struggled to maintain even minimum sanitary standards. The situation was exacerbated by a steady influx of military units and civilians into the metropolitan area, raising concerns about the imminent threat of severe epidemics breaking out in the city.

On April 19, MacArthur suggested to Krueger that the 6th Army could resolve Manila’s water supply crisis by seizing "the reservoir in the Montalban area." He inquired how soon the installation could be captured. This query puzzled Krueger, who was aware that the only true reservoirs linked to the Manila water system were located west of the Marikina River and had been under American control since February. Furthermore, Krueger understood that Wawa Dam, the nearest water supply installation to Montalban, was no longer connected to the metropolitan system. He subsequently asked MacArthur if by "reservoir in the Montalban area," he meant Ipo Dam, the only major water installation still in Japanese hands. Krueger’s question seemingly led to further examination of Manila’s water system at General Headquarters, Southwest Pacific Area (GHQ SWPA). On April 22, MacArthur radioed back to Krueger, confirming that Ipo Dam was indeed the preferred objective. He emphasized that capturing the Ipo installation would effectively solve Manila’s water supply problems. Upon receiving this directive, Krueger ordered the 11th Corps to launch a drive on Ipo Dam as soon as possible.

This shift in forces meant the 112th Cavalry Regiment had to move south to take over the vacated positions. General Wing conducted a reconnaissance-in-force that revealed the Kawashima Force’s defenses south of Route 52 were considerably weaker than those around the main highway. In light of this intelligence, the plan for assault was set into motion. On the night of May 6, the 103rd Regiment was ordered to advance towards Mount Katitinga and prepare to attack the dam. Supporting this effort, the 172nd Regiment would strike across a two-mile-wide front to the left of the 103rd towards the dam, while the 169th Regiment was tasked with demonstrating along Route 52 to pin down Japanese forces in the Bigti region. Additionally, Marking's Fil-American Yay Regiment at Norzagaray was to make a feint drive eastward north of the Angat River, targeting Mount Kabuyao.

During the first three days of May, General Chase conducted probing attacks in preparation for a concerted offensive aimed at Wawa Dam, which was set to begin on May 4. Simultaneously, General Yokoyama observed what he believed to be a slowdown in enemy progress, leading him to conclude that American forces must be redeploying northward or evacuating from Luzon entirely. This prompted him to prepare a limited counteroffensive, consisting of a series of harassing and delaying actions designed to pin down enemy forces on this front. Consequently, Yokoyama was not anticipating a major offensive on May 4. However, on that day, the 145th Regiment managed to gain up to 1,000 yards along the northern and northeastern slopes of Pacawagan, while the 152nd Regiment advanced approximately 500 yards northward along Woodpecker Ridge. Although these territorial gains were not monumental, Yokoyama became increasingly concerned about the strength of the American attacks and made the urgent decision to launch his counteroffensive. As Japanese forces hurried to reposition for their counterattacks, the 145th Regiment struck eastward, successfully seizing the rocky summit of Mount Binicayan. Meanwhile, the 152nd continued its efforts along Woodpecker Ridge. This coordinated assault completely surprised General Kobayashi’s troops, rendering their planned counterattack impossible as they were forced to shift their focus to defending their critical positions. In the southern sector, General Kawashima dispatched one battalion toward Montalban; however, the heavy air assaults that preceded Wing’s offensive made it impossible for the Japanese unit to organize effectively for their attack. Adding to the Japanese troubles, the remnants of the Noguchi Force were unable to provide any significant reinforcements. Despite the surprise and disarray among the Japanese defenders, they could not prevent the 145th from capturing the crest of Binicayan on May 9. The troops stationed on Woodpecker Ridge experienced some success by halting the advance of the 152nd and initiated a week of increasingly aggressive dawn and dusk raids starting on May 14.

Recognizing the futility of the ongoing conflict, which had resulted in over 1,300 Japanese casualties, General Yokoyama ordered an immediate withdrawal of all units involved on May 15. However, these orders would not reach the front lines until a week later. In the meantime, capitalizing on the element of surprise achieved during the night attack on May 6, General Wing launched an offensive that made excellent progress. The 103rd Regiment rapidly gained control of the western slopes of Katitinga and advanced swiftly along the ridgeline toward Hill 1000. Meanwhile, the 172nd Regiment reached the foot of a rocky ridge two miles southeast of Bigti, and the Marking Regiment encountered no resistance as it marched over seven miles eastward, ultimately halting just a mile and a half northwest of Kabuyao. The only significant resistance encountered occurred at Hill 535, where elements of a guerrilla unit were repelled by Japanese defenders. The unexpectedly weak Japanese opposition prompted the 43rd Division to sustain its offensive momentum without pause. By May 11, the 103rd had secured Hills 805 and 810, while the 172nd was probing Japanese defenses on Fork Ridge and advancing to the southwestern slopes of rocky Hill 815. The Marking Regiment had successfully overrun Kabuyao, though they were unable to capture Four-Corner Hill. At this point, Japanese resistance began to stiffen as American forces clashed with General Kawashima’s main defenses. In response, Wing ordered the 169th Regiment to mount a limited attack on Osboy Ridge and directed the Marking guerrillas to launch a strong assault toward Ipo. Supported by artillery, Colonel Marcus Augustin succeeded in breaking through Four-Corner Hill on May 12, marking a critical turning point in the offensive.

Unaware of Kawashima’s precarious situation, Yokoyama directed the Kawashima Force to initiate a new counterattack against the left and left rear of the 38th Division, deeming the situation for the Kobayashi Force to be more critical. As a result, Kawashima was compelled to divert one battalion for this unnecessary assault, which weakened the Japanese defenses. This strategic miscalculation enabled General Wing to make significant gains on May 13, with the 103rd Regiment capturing Hill 860, the 172nd clearing much of Hill 815, and the Marking guerrillas seizing the summit of Hill 803. The extent of these advances prompted Kawashima to ultimately disregard Yokoyama’s orders and recall his assault battalion. This battalion promptly mounted a counterattack against the Americans in a futile attempt to regain lost ground, managing only to restrict the 103rd and 172nd Regiments to minor gains on May 14. Simultaneously, Colonel Augustin’s patrols crossed the Angat River unopposed, discovering that the dam remained intact and the powerhouse on the south bank was largely undamaged. However, the patrol force, too weak to hold these installations, retreated before dawn to the crest of Hill 803, where the remainder of the regiment was occupied with mopping up remaining resistance. Looking further south, General Griswold’s 14th Corps had already secured most of southern Luzon and had successfully landed General MacNider’s 158th Regiment in the Bicol Peninsula. In response, the remnants of the Fuji Force and the depleted Kogure Detachment decided to evacuate the open Santa Maria Valley, opting to retreat to more defensible positions at the Kapatalin Sawmill. This allowed Griswold to move the 7th and 8th Cavalry Regiments into the valley, with the former beginning a drive along Route 455 on May 6.

Following a heavy air and artillery bombardment, the cavalrymen launched their assault on the sawmill on May 9 and swiftly overran the enemy defenses by mid-afternoon. After a brief pause to reorganize, the 7th Cavalry advanced up Route 455, leaving their vehicles behind, and reached Lamon Bay by May 13. Meanwhile, on the Bicol Peninsula, progress had been agonizingly slow throughout late April. It wasn’t until April 28 that the Cituinan Hills were fully secured, leading to the collapse of organized Japanese resistance in the region. Following this, the 158th Regiment began moving northwestward toward Iriga and San Agustin, rapidly overrunning the remaining weak enemy positions along Route 1. Progress continued to be painfully slow, and it was not until 28 April that organized Japanese resistance finally collapsed. The task of clearing the Cituinan Hills cost the 158th Infantry approximately 40 men killed and 235 wounded; the Japanese lost almost 700 men killed in the region. Although the 158th RCT did not know it, the reduction of the Cituinan Hills marked the end of large-scale organized resistance on the Bicol Peninsula, where no more than 1,400 Japanese remained alive as of the end of April. Simultaneously, the 5th Cavalry Regiment captured Calauag on April 14 and began a two-pronged advance toward San Agustin by the end of the month. On May 2, San Agustin was finally taken as elements of both regiments converged there. Guerrillas had informed XIV Corps, which acquired control of the 158th RCT on 22 April, that a Japanese force of some 2,500 men was dug in along the slopes of Mt. Isarog, an extinct volcano centering eight miles northeast of San Agustin. This report the 5th Cavalry and 158th Infantry proved false in a series of patrol actions between 2 and 15 May. The next day, the 16th, General MacNider radioed to General Griswold that the Bicol Peninsula was secure and that no signs of organized Japanese resistance remained. The two regiments continued patrolling for some weeks until, on 6 June, the 5th Cavalry returned to southern Luzon. The 158th RCT busied itself with the problem of reorganizing and equipping guerrilla forces and in mid-June turned over responsibility for further mopping up to the Filipinos. To that time the operations to clear the Bicol Peninsula had cost the USArmy units involved approximately 95 men killed and 475 wounded. The Japanese had lost over 2,800 killed and 565 captured, including 350 Formosan labor troops whom the Japanese Army had left to fend for themselves.

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In June 1945, amidst the Pacific War, American forces sought to liberate Luzon from General Yamashita's entrenched troops. Under Generals Eichelberger and Krueger, the 8th Army faced fierce resistance in the mountains and vital routes. As Japanese defenders struggled, the Americans advanced strategically, leading to fierce battles across treacherous terrain.  The turning point came with the seizure of Baguio, crucial for the campaign.