Last time we spoke about liberation of Luzon.. American forces, led by General Eichelberger and supported by General Krueger's armies, relentlessly advanced against the entrenched Japanese defenders of General Yamashita’s 14th Area Army. Amid thick jungle and treacherous terrain, battles raged through the northern mountain ranges, as American troops aimed to restore the Filipino government. Facing overwhelming odds, the Japanese forces displayed extraordinary resilience, temporarily halting American progress. Remarkable efforts from General Swift’s 1st Corps across Routes 9 and 11 led to significant breakthroughs as American forces captured critical positions, including Sablan and Baguio. However, the Japanese command, complacent and misjudging the American strategy, fell into disarray. As the tide turned with relentless American assaults, key Japanese positions were systematically dismantled. By late April, most of Luzon was liberated, restoring hope and autonomy to the Filipino people. 

This episode is Invasion of Balikpapan

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. 

The battles for Okinawa and Luzon just closed up, and today we are going to be venturing back to the Dutch East Indies. As we left off in mid-May, the tides of war were shifting dramatically on the island of Luzon, with General Krueger's 6th Army celebrating significant victories across the region. In the north, General Swift’s 1st Corps had successfully secured the scenic Baguio area, known for its lush mountains and cool climate, a stark contrast to the tropical heat that engulfed much of the Philippines. Yet, the fighting was far from over, as fierce battles continued on three major fronts. Colonel Volckmann’s guerrilla 121st Regiment was making strides, snagging much of the strategically vital Bessang Pass, a crucial artery connecting northern Luzon to the central regions. However, their success came at a cost, leaving them overextended amidst fierce Japanese resistance. Meanwhile, General Gill’s weary 32nd Division managed to claim dominance over the rugged terrain of Salacsac Pass along the historic Villa Verde Trail, known for its breathtaking views and treacherous paths that had challenged both soldiers and their supply lines.

General Mullins’ 25th Division achieved a remarkable breakthrough by capturing the key Balete Pass, opening the way for further advances. Not stopping there, the 25th Division pressed onward, quickly redirecting their focus northward towards the town of Santa Fe. By May 24, the 27th Regiment had cleared the Sawmill River valley, an area teeming with dense foliage and rugged hills, a significant accomplishment that paved the way for the next objectives. From there, the 1st Battalion expertly maneuvered eastward against the imposing Kanami Ridge. On May 22, the 161st Regiment dealt a heavy blow to Japanese positions in a stronghold on Mount Haruna, a location known for its steep, challenging slopes. Following this triumph, they began their descent down the northern slopes of Haruna Ridge, gearing up for a critical junction with the Villa Verde Trail by May 27. Meanwhile, the 35th Regiment launched a vigorous assault from Balete Pass, systematically clearing out the remaining Japanese caves and fortifications by May 26, culminating in the capture of Santa Fe the very next day. At Salacsac, the Japanese forces, led by General Iwanaka, initiated a limited counteroffensive, presumably to buy time for a strategic evacuation of their increasingly tenuous positions. If delay was indeed Iwanaka's intention, he executed it well; it wasn’t until May 19 that the American supply line was finally deemed secure again. The 2nd Battalion of the 128th Regiment resumed its push east from Hill 525, but the progress was slow. By May 22, the 1st Battalion had only managed to advance a mere 500 yards east from Hill 508, while the 3rd Battalion commenced a southward and southeastward advance from Hill 516 on May 16. It was not until May 24 that the relentless fighting in the region bore fruit, leading to the eventual clearing of the area, and Salacsac Pass was officially declared secured.

On that pivotal day, General Iwanaka began the difficult task of withdrawing the remnants of his battered forces northward, retreating up the winding valley of the Imugan River. This river, which flows through a lush, verdant landscape, would serve as a vital sanctuary, albeit one fraught with danger for the disheartened Japanese troops. Meanwhile, the American forces were gaining ground. The 2nd Battalion aggressively seized control of Hill 527, a position that provided a commanding view of the surrounding area, crucial for planning further advances. The 126th Regiment took decisive action, utilizing trucks to transport troops swiftly along Route 5 to Balete Pass before launching an assault toward Imugan from the east and southeast. Concurrently, the guerrilla 1st Battalion of the Buena Vista Regiment embarked on a northward push from Valdez, culminating in the hard-fought capture of Hill 528 on May 28. This hill, commanding and steep, presented a formidable challenge but also promised a vantage point critical for any further operations in the region. The very next day, Imugan finally succumbed to the relentless pressure of the advancing American forces, marking a significant milestone as the Villa Verde Trail came firmly under American control. This development effectively concluded the arduous operations of the 32nd Division. It was a costly campaign for General Gill; the division suffered approximately 825 men killed, 2,160 wounded, with an alarming 6,000 classified as non-battle casualties. In stark contrast, the Japanese defense was decimated, with at least 5,750 of the 8,750 troops they had deployed to defend the trail lying dead.

As we gaze northward, we find Colonel Volckmann’s guerrillas, who had extended themselves too thinly across Bessang Pass and into the challenging terrain of Yubo Ridge. The aftermath of their overreach saw them facing fierce Japanese counterattacks that swiftly pushed them back across Lamagan Ridge in the latter part of May. However, a small contingent managed to hold tenaciously onto the eastern slopes of Langiatan Hill, a strategic position that allowed them to maintain some level of influence in the region. Additionally, a robust force from the Japanese 76th Regiment assembled south of Butac, planning an offensive northward. However, this advance was met with fierce resistance from the guerrilla 15th Regiment, who successfully repelled the attack. Seizing the momentum, Volckmann directed the 15th Regiment into a new offensive eastward, and by the end of May, they had successfully re-secured their foothold up to Lamagan Ridge. Meanwhile, elements of the 121st Regiment executed a remarkable retaking of both Langiatan Hill and Yubo Ridge, gradually restoring control over this strategically vital area. Looking south, we find General Hall's 11th Corps vigorously engaged in two crucial offensives aimed at capturing Ipo Dam and Wawa Dam, both essential water reservoirs located east of Manila. The strategic importance of these dams cannot be overstated; they were vital not only for securing fresh water but also for controlling the flow of operations in the region. However, the relentless heavy downpours that characterized the season rendered air support missions impractical, exacerbating an already challenging supply situation for the advancing troops. As a result, General Wing’s 43rd Division was forced to pause its offensive late on May 14 to reassess and devise new attack plans. 

As of late May 14, the 43rd Division found itself in a precarious situation, necessitating a halt to operations to devise new attack plans. To this point, the division had made limited progress toward securing Route 52, a crucial supply line vital for their mission to capture Ipo Dam. Recognizing the urgency, General Wing decided it was essential to commit the 169th Regiment to a targeted attack to clear this road, as it would serve as a critical route for both supply and evacuation in the coming days. The adverse weather conditions had created a significant operational hindrance. For nearly the entire duration of their offensive, intermittent rains had severely disrupted ground and aerial supply chains, as well as evacuation and the crucial air support operations necessary for a successful advance. Ground conditions had become challenging, and division engineers struggled to construct and maintain supply roads at a pace even close to that of the infantry's advances. Consequently, supply drops and hand-carried provisions were just sufficient to keep combat units barely above the minimum required levels, but the evacuation of sick and wounded soldiers remained a pressing issue that plagued the division. By May 14, the situation worsened significantly. For the first time since May 6, the 5th Air Force was completely grounded, unable to conduct any air support or supply missions due to the worsening weather conditions. This represented a troubling turning point for the 43rd Division. Moreover, intelligence reports indicated that sizable groups from the Japanese Tomono and Hana