- 175 - Pacific War Podcast - Visayas Offensive - March 25 - April 1 - , 1945

Last time we spoke about the fall of Iwo Jima. General Schmidt pushed through Japanese defenses, facing strongholds like Cushman’s Pocket and General Senda’s positions, with intense fighting and heavy casualties on both sides. Despite stubborn resistance, the Marines gradually advanced, employing tanks and artillery support. The Japanese, under General Kuribayashi, fought tenaciously, culminating in a final assault on March 26. After brutal combat, Iwo Jima was declared secured, but at great cost: 18,000 Japanese and over 6,800 American lives lost. Meanwhile, in New Britain, Australian forces continued their offensive, capturing strategic positions despite fierce enemy resistance. In the midst of a fierce conflict, Australian battalions advanced into enemy territory, capturing strategic positions while facing heavy resistance. Notable victories included the successful ambushes by the 2/7th Battalion and the capture of key locations like the But airfield. Despite facing fierce counterattacks from the Japanese, particularly at Slater’s Knoll, the Australians maintained their momentum. As the Japanese command faced internal crises, the Australians continued their relentless push, ultimately leading to significant territorial gains and weakening enemy forces.

This episode is the Visayas Offensive

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. 

Within northern Luzon, by mid-March, General Clarkson’s 33rd Division was exploring the western routes to Baguio. Colonel Volckmann’s guerrilla unit had taken control of San Fernando and was engaged in combat around Cervantes. Meanwhile, General Mullins’ 25th Division had advanced to Putlan, and General Gill’s 32nd Division was involved in a fierce battle at Salacsac Pass. Following the capture of Putlan, General Swift instructed Mullins to push through Balete Pass to secure the vital Santa Fe region. On March 12, the 27th and 161st Regiments began advancing north and northwest, successfully clearing the Minuli area and establishing a foothold on Norton Ridge by March 15. At the same time, the 35th Regiment initiated a broad maneuver around Balete Pass via the Old Spanish Road, but this was soon hindered by intense artillery and mortar fire from the positions of the 11th Independent Regiment. The road also required significant engineering efforts to support the outflanking force, leading Mullins to ultimately halt the 35th’s assault. However, General Konuma was unaware of this; fearing an outflanking maneuver from Carranglan, he had no choice but to keep around 3,000 of his best troops in this seemingly secure area. On March 15, Mullins ordered the reinforced 161st Regiment to launch a holding attack to the north while the majority of the 27th Regiment executed a flanking maneuver over Myoko Ridge, Mount Myoko, and Lone Tree Hill to encircle Balete Pass from the east. After regrouping at Putlan, the 35th was also tasked with capturing Mount Kabuto to subsequently advance northwest along Balete Ridge and connect with the 27th at Myoko.

Mullins launched a renewed offensive on March 16, facing stubborn resistance from the 161st as it gradually advanced toward Norton’s Knob, which was successfully captured by the end of the month. On March 22, the 27th began its flanking maneuver, with the 1st Battalion moving east into the elevated terrain south of Kapintalan by March 28, while the 2nd Battalion advanced nearly 3,750 yards up the wooded Myoko Ridge to the east. Meanwhile, the 35th's attempt to encircle the enemy via Kabuto started off well, reaching the northern slope of Balete Ridge on March 22. However, Konuma's recently arrived reinforcements launched a series of strong counterattacks and harassment raids, forcing the 35th to withdraw by March 28. With the other two regiments stretched thin and unable to penetrate the enemy's main defenses, Mullins ordered the 35th to position itself between the 27th and 161st Regiments to assault Highley Ridge from the east. By the end of March, the 161st was advancing northeast along Highley Ridge toward Crump Hill, which finally fell on April 8, bringing the advance to a halt. The 35th supported this effort with an attack on Kapintalan, which was ultimately captured by April 21. Meanwhile, the 27th continued to struggle through the challenging terrain of Myoko Ridge against fierce opposition, not reaching Woody Hill until April 12. This slow progress allowed Konuma to reinforce the Myoko sector with four understrength infantry battalions. Nevertheless, the brave soldiers of the 27th Regiment persevered, securing the Pimple on April 15 and advancing an additional 350 yards northeast by April 21.

Looking west, Clarkson aimed to advance battalion combat teams toward Baguio via Route 11, the Galiano road, and the Tuba Trail. However, Swift declined to approve such ambitious plans, limiting the 33rd Division to a more restrained offensive. Although dissatisfied, Clarkson continued the attack along Route 11, managing to reach Camp 3 by the end of March. In the central area, patrols faced no opposition as they approached within a mile of Galiano, but other patrols discovered increasing signs that the Japanese were preparing to defend the Tuba Trail vigorously. Eventually, a robust reconnaissance force secured Bauang on March 19, with patrols then moving east to occupy Naguilan four days later and Burgos by the month's end. Meanwhile, at Salacsac Pass, the 127th Regiment fought from Hill 502 to Hill 504 against fierce resistance, while Gill sent the 2nd Battalion, 128th Regiment up the trail from Valdez toward Imugan, where they were ultimately halted by vigilant Japanese forces. By March 23, the 1st Battalion of the 127th Regiment reached the crest of Hill 504; the 2nd Battalion advanced past it to Hill 505; and the 3rd Battalion managed to position one company at the base of Hill 507D. However, with its forces stretched thin and dwindling, the 127th was unable to capitalize on its seemingly advantageous position, allowing General Iwanaka to launch a strong counterattack on Hill 507D that successfully repelled the 3rd Battalion. As a result, Gill decided to withdraw that unit and the stalled 2nd Battalion, 128th Regiment, while the majority of the 128th relieved the 127th in the Hill 502 sector.

Beginning on March 25, the 128th Regiment advanced aggressively eastward, successfully capturing the previously overlooked Hill 503, fully securing Hill 504, and expanding its control over Hill 505 by the month's end. However, on the night of March 31, Iwanaka launched a daring counterattack, reclaiming Hill 504 and nearly taking all the territory east of Hill 502. By April 4, both the 127th and 128th Regiments had sustained significant casualties and could no longer continue the offensive. Consequently, Swift had to order the 33rd Division to relieve the beleaguered 126th Regiment in the Ambayabang and Arboredo River valleys, allowing this unit to reposition north of the Villa Verde Trail to execute a flanking maneuver along the Miliwit River valley. Fortunately for Clarkson, General Krueger persuaded MacArthur to free the 129th Regiment from its duties in Manila, sending it to bolster the now overstretched 33rd Division. Once the rest of the 37th Division arrived at the Baguio front, which Krueger anticipated would happen in early April, Swift could initiate a two-division assault on Baguio. In the meantime, Clarkson promptly dispatched the 129th to Burgos, and by April 1, it had advanced to Salat. 

The Japanese opposing the reinforced 33d Division were no longer in the shape they had been at the end of February. The 58th IMB and the 23d Division had both suffered heavy losses during March, losses that probably stemmed largely from lack of food and medical supplies rather than from combat action. By mid-March Japanese supply problems on the Baguio front had progressed from bad through worse to impossible. First, supplies had moved westward over the new Baguio-Aritao supply road far more slowly than anticipated, a development attributable in large measure to Allied Air Forces strikes on that road and along Route 5 north and south of Aritao. Second, operations of the 66th Infantry, along Route 11 north from Baguio, and the activities of the 11th Infantry, , in the Cagayan Valley, had made it virtually impossible for the Japanese to bring any food into the Baguio area from the north. Third, the Japanese tried to do too much with the limited amount of supplies available on the Baguio front. They were attempting to supply 23d Division and 58th IMB troops along the MLR; send certain military supplies north up Route 11 for the 19th Division; feed 14th Area Army headquarters and a large civilian population in Baguio; and establish supply dumps north and east of the city against the time of eventual withdrawal. Almost inevitably the principal sufferers were the front-line troops. By mid-March the best-fed Japanese combat troops on the Baguio front were getting less than half a pound of rice per day as opposed to a minimum daily requirement of nearly two and a half pounds. Before the end of the month the troops on the MLR were down to less than a quarter of a pound of rice a day. Starvation and diet-associated diseases filled hospitals and sapped the strength of the combat units. Generally, effective frontline strength was far lower than reported ration strength indicated. Medical supplies were consumed rapidly, and by the end of March, for example, there was virtually no malaria phophylaxis left in Baguio area hospitals. Looking upon the situation on the Baguio front with frank pessimism, Yamashita in mid-March directed inspection of terrain north, northeast, and east of the city with a view toward preparing a new defense line. His attitude became even plainer when, on or about 30 March, he ordered Japanese civilians and the Filipino puppet government to evacuate Baguio. Indeed, the future on the Baguio front was so bleak by the end of March that almost any other army would have withdrawn to new defenses forthwith, thereby saving troops for future battle. But not so the Japanese. Yamashita decided that the existing MLR would be held until the situation became hopeless. At the end of March that portion of the MLR held by the 23d Division was still intact, and the 58th IMB was busy deploying additional strength along its section of the line. One independent infantry battalion was on high ground north of Route 9 at Sablan; and another held defenses at Sablan. A reinforced company was at Burgos and, less that company, another independent infantry battalion held reserve positions at Calot, a mile and a half southeast of Sablan. One understrength battalion was responsible for defending the rough terrain from Sablan six miles south to Mt. Apni, where a tie-in was made with the right flank of the 23d Division. Maj. Gen. Bunzo Sato, commanding the 58th IMB, expected that the emphasis of any Allied drive in his sector would come along Route 9, but he did not neglect the other approach in his area, the Galiano road. Since the understrength battalion stationed astride the road was not strong enough to withstand a concerted attack, he directed his main reserve force, the 1st Battalion of the 75th Infantry, 19th Division, to move west out of Baguio to defenses at Asin. This step left in Baguio a reserve force of roughly three provisional infantry "battalions," which together probably could not muster over 750 effectives.

In the Salacsac area, as casualties in the western pass were rapidly increasing and Allied air and artillery strikes made it nearly impossible for the 2nd Tank Division to transport supplies, Iwanaka concluded that his forward positions were nearly untenable. He began planning to redeploy forces to defend the eastern pass. Consequently, when the 126th Regiment launched its new offensive on April 5, it faced unexpectedly light resistance, quickly capturing Hills 518 and 519 within two days and cutting off a Japanese supply route leading north from Hill 504 across the eastern slopes of Hill 519 and up Mount Imugan. However, Iwanaka swiftly recognized the emerging threats and sent reinforcements to intercept the 126th’s advance, delaying the capture of Hills 511 and 512 until March 13 and effectively halting further progress. At the same time, the reorganized 128th Regiment resumed its assault eastward on April 7, successfully retaking the Hill 504-505 sector and capturing Hill 506 by April 10. The following week, the 128th fought tenaciously to secure this elevated ground against fierce resistance, managing to push all the way to Hills 506B, 507C, and 507D with their remaining strength, nearly securing the western pass by April 17. Meanwhile, after the fall of San Fernando, General Krueger instructed Volckmann to advance inland along Route 4 toward Bontoc. However, the Provisional Battalion established at Cervantes could only withstand the relentless enemy pressure until April 4, when it was ultimately forced to retreat into the hills northwest of the town. Consequently, Volckmann had to quickly deploy the 121st Regiment to barrio Butac in preparation for an eastward push along Route 4.

After a week of intense back-and-forth combat, this elite guerrilla unit succeeded in establishing footholds along the northern parts of Lamagan and Yubo Ridges. Over the next few days, the 121st made slow and arduous progress, ultimately gaining control of Route 4 nearly to the southeastern edge of Bessang Pass by mid-April. Further south, by mid-March, General Wing’s 43rd Division had effectively secured the Antipolo sector, while General Hurdis’ 6th Division was advancing well toward Mount Baytangan. At this point, General Hall’s 11th Corps assumed responsibility for operations against the Shimbu Group, now rebranded as the 41st Army. However, he quickly decided to maintain the offensive against General Yokoyama’s left flank, with the 20th and 1st Regiments focusing on an eastward push alongside the 43rd Division. Meanwhile, General Noguchi had completed his withdrawal to the Sugarloaf Hill-Mount Tanauan line, where he would receive reinforcements from elements of the Kogure Detachment. Simultaneously, General Kobayashi was struggling to stabilize his left flank, bolstered by one reserve battalion. On the morning of March 15, the American offensive resumed, with the 103rd Regiment continuing its assaults on Benchmark 7 Hill to secure Route 60-A, while the 172nd Regiment launched its initial attacks toward Sugarloaf Hill, facing fierce resistance. On March 17, the 1st Regiment renewed its advance toward Baytangan, initially making good progress and digging in about a mile west-southwest of the mountain’s summit. However, during the night, a barrage of mortar fire followed by an infantry counterattack forced the Americans to retreat in disarray.

As a result of this setback, the 1st Division began to advance eastward more cautiously, facing determined resistance and heavy mortar fire. By March 22, it was only slightly closer to Baytangan's crest than it had been five days earlier. The 20th Regiment on the left also encountered strong resistance, managing to reach a point a mile and a half west of Baytangan by March 22. At the same time, a company maneuvering to the north established a foothold on a wooded ridge overlooking the Bosoboso Valley. Meanwhile the 103d Infantry finally overran the defenses on Benchmark 7 on 18 March, killing about 250 Japanese in the process. The Japanese battalion there had delayed the 103d's attack toward Mt. Tanauan until the morning of 18 March, but by evening of that day the regiment's troops had begun swarming up the bare, rocky, southern and southwestern slopes of the mountain.

Over the next three days, American forces slowly advanced through a complex of caves and bunkers until they secured the mountain's summit, while other units captured Benchmark 23 Hill and patrolled northward into the southeastern part of the Bosoboso Valley. By March 19, the 172nd Division was halted, containing Sugarloaf to the west. They bypassed it to the north and east, initiating new assaults toward Mounts Yabang and Caymayuman, making significant progress to the east but less so to the north by March 22. Despite concerns that Hall’s four exhausted regiments might lack the strength to turn the 41st Army’s left flank, the ongoing pressure and the failure of previous counterattacks ultimately compelled Yokoyama to order his threatened units to withdraw to new positions east of the Bosoboso River. Therefore, when the 6th and 43rd Divisions resumed their attacks on the morning of March 23, the withdrawal was already in full progress.

Over the next three days, the 1st and 20th Regiments faced only scattered and disorganized resistance, allowing them to establish positions over a mile north and south of Baytangan along the ridgeline that overlooks the Bosoboso Valley. Meanwhile, the 172nd Regiment successfully captured Mount Yabang and most of Mount Caymayuman, while the 103rd Regiment advanced quickly northward, taking barrio New Bosoboso, Mount Balidbiran, and Benchmark 21 Hill. On March 27, the 1st Regiment secured the crest of Baytangan, and the 172nd Regiment eliminated the last organized opposition at Sugarloaf Hill. With Yokoyama’s left flank collapsing, Hall could focus on capturing Wawa Dam and destroying the remaining elements of the Kobayashi Force west of the Bosoboso River, a mission assigned to the 6th Division. During this initial offensive, approximately 7,000 Japanese soldiers were killed since February 20, while American casualties included 435 killed and 1,425 wounded. Hurdis’ initial strategy for capturing Wawa Dam involved the 1st and 20th Regiments advancing northward to clear Woodpecker Ridge and Mount Mataba, while the 63rd Regiment conducted diversionary attacks on the western slopes of Mataba. This new offensive began on March 28 but quickly faced intense small arms, machine-gun, and mortar fire, leading to a back-and-forth struggle against fierce enemy resistance. By April 3, the 20th Regiment had advanced less than half a mile toward Mataba, and the 1st Regiment had gained only 250 yards to the north. General Hurdis had hoped his attack, directed against the Kobayashi Force southern flank, would be far more successful, but the Kobayashi Force, rapidly and efficiently, had reoriented its defenses, which it had laid out primarily to face an attack from the west. The force's two remaining provisional infantry regiments, the Central and Right Sector Units, were still relatively intact, and the Central Sector Unit, bearing the brunt of the 6th Division's offensive, had recently been reinforced by remnants of the Left Sector Unit and elements of the Shimbu Group Reserve. Other factors bearing on the 6th Division's slow progress were the declining strength and deteriorating combat efficiency of its infantry regiments. The 20th Infantry could muster only 2,085 effectives on 3 April; some of its rifle companies were reduced to the combat strength of platoons. The situation within the 1st Infantry, with an effective strength of 2,150, was little better. As of 3 April the commanders of both regiments rated their units' combat efficiency only as "fair," the lowest ranking of three terms each had employed since the Lingayen Gulf assault.To bolster protection for Hurdis’ right flank, the 103rd Regiment also captured Hill 1200 on the east bank of the Bosoboso River by the end of the month.

Due to the slow progress of Hurdis’ offensive, on April 5, Hall assigned General Cunningham’s Baldy Force, which consisted of the 112th Cavalry Regiment and the recently arrived 169th Regiment, to take control of the area north of Mount Oro. This move would free up most of the 63rd Regiment to support the 20th Regiment and continue the assault north toward Mataba, while the 1st Regiment maintained its position along Woodpecker Ridge. From April 6 to 9, the 63rd made only limited progress to the east; however, on April 10, it shifted its focus to an offensive on the western slopes of Mataba, quickly securing the southwestern quarter of the mountain with minimal resistance. In response, Kobayashi promptly redirected his forces back to Mataba from the north-south ridge to prevent the 63rd from reaching the mountain’s summit until April 17. At the same time, the 1st Regiment resumed its advance along Woodpecker Ridge but again faced strong enemy opposition, resulting in only limited gains. Looking further south, by March 23, the 187th Glider Regiment and the 511th Parachute Regiment had advanced to Santo Tomas and Tanauan but were unable to completely clear these areas. Meanwhile, the 158th Regiment secured Balayan, Batangas, and the Calumpan Peninsula, pushing toward Mount Macolod, where they were ultimately halted by significant forces from the Fuji Force. At this stage, as Krueger planned to launch an offensive into the Bicol Peninsula using the 158th, he needed to relieve the 11th Airborne Division with the barely rested 1st Cavalry Division. This division quickly took control of the Santo Tomas-Tanauan area, while General Swing’s units maneuvered around the west side of Lake Taal to relieve the 158th at Macolod.

As a result, General Griswold renewed his offensive on March 24. The 187th attempted to attack Macolod but was unsuccessful. A task force composed of units from Swing’s other two regiments advanced quickly north toward Lipa, only to be halted at the hills southeast of the town. The 8th Cavalry captured Santo Tomas after a fierce battle and took Tanauan two days later. The 7th Cavalry advanced about five miles east into the corridor between Mounts Maquiling and Malepunyo, while the 12th Cavalry pushed along Route 21, moving about four miles beyond Los Baños. On March 27, Swing’s task force finally overcame the enemy defenses southeast of Lipa, but it was the 8th Cavalry that ultimately secured this strategic town two days later. Griswold’s successful offensive also forced around 2,000 troops from the Fuji Force to retreat along Route 21 and through the Santa Maria Valley to join Yokoyama’s forces in the mountains east of Manila. In response, Krueger devised a plan to prevent the potential influx of Japanese reinforcements around the eastern and northern shores of Laguna de Bay. He instructed Hall to clear the northern shore of the lake, block the Santa Maria Valley, and secure Route 21. While the 187th continued its assault on Macolod, Griswold ordered his other units to push eastward to secure Laguna de Bay and Tayabas Bay. Accordingly, on March 30, the 103rd Regiment advanced in small increments along the northern shore of Laguna de Bay, reaching Siniloan by April 4. The 12th Cavalry moved to Calauan and then south along a secondary road toward San Pablo, encountering strong enemy positions that wouldn’t be overcome until April 5. The 5th and 7th Cavalry Regiments fought through the Maquiling-Malepunyo corridor against determined but disorganized Japanese resistance, successfully occupying San Pablo by April 2. Additionally, elements of the 188th Glider Regiment pushed east through the mountain corridors, reaching Tiaong on April 3 and Lucena three days later.

By April 6, the 5th Cavalry and the 103rd Regiment had established contact at Pagsanjan, effectively isolating the 41st Army. The next day, patrols from the 11th Airborne Division headed north from Lucena, while 1st Cavalry Division patrols departed from Pagsanjan heading south. They successfully linked up at Lucban by April 10 and then advanced eastward to Mauban. At the same time, a company from the 188th traveled along Route 1 across the Bondoc Isthmus, reaching Atimonan on April 11. Griswold’s patrols also moved towards Mount Malepunyo, where the Fuji Force was preparing for its final stand. By April 16, preliminary assaults had concentrated enemy resistance around Mount Mataasna-Bundoc. Meanwhile, after a week of intense aerial bombardment, Brigadier-General Hanford MacNider’s 158th Regiment successfully landed at Legaspi Port with minimal opposition on April 1. They quickly secured the port and the nearby airfield, then advanced to Daraga before moving south along Route 1 to occupy the Sorsogon Peninsula, where they encountered machine-gun fire from the Mount Bariway-Busay Ridge. The following morning, the troops had to retreat east of Daraga, and in the coming days, the 158th faced tough fighting in the challenging, jungle terrain to overcome resistance in the Daraga area. Concerned about delays in occupying the Sorsogon Peninsula, MacNider landed his anti-tank company at Bacon on April 6, which occupied Sorsogon without opposition. Meanwhile, the 2nd Battalion continued its overland advance, reaching Bulan by April 12, where they targeted a significant Japanese concentration. Simultaneously, MacNider’s other two battalions attacked Camalig on April 11 and began their unsuccessful assault on enemy positions in the Cituinan Hills.

By April 1, the 188th had successfully eliminated the last organized resistance in the rugged hills south of Ternate. Meanwhile, the 2nd Battalion of the 151st Regiment launched an assault on Caballo Island on March 27 but could not fully dismantle the entrenched enemy positions until April 13. The Japanese in the pits and tunnels created an almost insoluble problem for the 2d Battalion, 151st Infantry. The Japanese had so emplaced their weapons, which included machine guns and mortars, that they controlled all approaches to the mortar pits but could not be reached by American artillery or mortar fire. When the 151st Infantry concentrated its mortar fire against the pits' entrances, the Japanese simply withdrew into the tunnels. When the American fire ceased--at the last possible moment before an infantry assault--the Japanese rushed out of the tunnels to man their weapons. Tanks were of no help to the American troops. From positions near the rim of the pits the tanks were unable to depress their guns sufficiently to do much damage to the Japanese. If the tanks tried to approach from above, they started sliding down Hill 2's slopes into the pits. No combination of tank, artillery, and infantry action proved of any avail, and the 151st Infantry had to give up its attempts to take the Japanese positions by assault. On 31 March engineers tried to pour diesel oil into one of the tunnels connecting the mortar pits, employing for this purpose a single ventilator shaft that was accessible to the 151st Infantry. Nothing came of the effort since it was impossible to get enough oil up the steep slopes of the hill to create a conflagration of significant proportions within the tunnels. Nevertheless, burning the Japanese out seemed to promise the only method of attack that would not risk the unduly heavy casualties of a direct infantry assault. No one, of course, wanted to throw away the lives of experienced troops on such an insignificant objective. Finally, the commander of the 113th Engineers, 38th Division, suggested pumping oil up the hill from the beach through a pipeline from a ship or landing craft anchored at the shore line. The Allied Naval Forces happily fell in with this idea and supplied the 151st Infantry with two oil-filled ponton cubes; the Allied Air Forces provided a 110-horsepower pump and necessary lengths of pipeline and flexible hosing; and the 592d Engineer Boat and Shore Regiment came through with an LCM to carry the pump and the ponton cubes. On 5 April over 2,500 gallons of diesel fuel were pumped into the pits and tunnels through the ventilator and were then ignited by white phosphorus mortar shells. "Results," the 38th Division reported, "were most gratifying." A huge flash fire ensued, followed by a general conflagration and several explosions. The engineers repeated the process on 6 and 7 April, and on the latter day carefully lowered two large demolition charges through the ventilator shaft and placed another at an accessible tunnel entrance. Set off simultaneously, the three charges caused an enormous volume of flames and several terrific explosions. For the next few days the 2d Battalion, 151st Infantry, tried to persuade a few Japanese who had lived through the holocausts to surrender and also executed a few infantry probing attacks. On 13 April a patrol entered the pits and tunnels, killed the lone surviving Japanese, and reported the positions cleared and secured. Following this, El Fraile was targeted, with Company F of the 151st and the 113th Engineers effectively neutralizing Fort Drum using gasoline and explosives. On April 16, troops from the 1st Battalion of the 151st Regiment attacked Carabao Island, facing no opposition.

Looking towards the Visayas, after capturing Palawan and Zamboanga, General Eichelberger set his sights on the Sulu Archipelago, where new airfields were to be established. On March 16, a reinforced company from the 162nd Regiment landed unopposed on Basilan Island and spent the next two days searching Basilan and nearby islets, finding no signs of Japanese forces. On April 2, the reinforced 2nd Battalion of the 163rd Regiment landed on Sanga Sanga Island, successfully clearing the Tawi Tawi Group by April 6. The remainder of the regiment made an unopposed landing near Jolo Town on April 9. Over the next two days, the Americans drove approximately 2,400 men of the 55th Independent Mixed Brigade from the heights immediately south and southeast of the town to secure a nearby airstrip. However, the Japanese retreated to more fortified hill masses further inland, where they had long prepared their defenses and began to resist fiercely. After initial attacks by Colonel Alejandro Suarez’s guerrillas failed to breach the Japanese positions, the 1st Battalion of the 163rd Regiment joined the fight and managed to overrun the enemy defenses by April 22.

On April 25, the 3rd Battalion launched an assault on Lieutenant-General Suzuki Tetsuzo’s final positions at Mount Tumatangus, which were ultimately subdued by May 2. However, the remaining Japanese forces continued to engage in guerrilla warfare. By this time, airfields in Zamboanga and Sanga Sanga had become operational to support the forthcoming invasion of Borneo.The first field at Zamboanga was a dry-weather strip 5000 feet long, completed on March 15 and immediately put to use by Marine Corps planes. The field, named Calarian Drome, could not answer the need for an all-weather strip 6000 feet long. Accordingly, engineers constructed a new strip, which the Marine aviators based there called Moret Field, about a mile to the east, and had it ready for all-weather operations by May 16. Used primarily by Marine Air Groups 12, 24, and 32, Moret Field was also employed by a 13th Air Force night-fighter squadron, an emergency rescue squadron, and 13th Air Force B-24s and P-38s staging through for strikes against Borneo. Marine Corps planes on March 16 executed the first support mission flown from a field in the Zamboanga area, covering the landing on Basilan Island. Later, Marine Corps planes from Zamboanga flew support for the Tawi Tawi and Jolo operations and undertook pre-assault bombardment and cover for the invasion of eastern Mindanao. While 13th Air Force planes executed most of the support for the invasion of Borneo, Marine Corps B-25s from Zamboanga also flew some missions. At Sanga Sanga Island there was a Japanese coral-surfaced strip about 2800 feet long. Engineers repaired and extended this strip to a length of 5000 feet by May 2, when fighters of the 13th Air Force began moving to Sanga Sanga from Palawan to provide close support for the initial landings on Borneo. These US Army planes were replaced in mid-May by units of the Royal Australian Air Force, which employed the all-weather Sanga Sanga field during later operations on Borneo. Finally, a Japanese field 3800 feet long on Jolo Island was repaired and used for aerial supply and evacuation operations in support of ground troops throughout the Sulu Archipelago.

Eichelberger's next target was the Central Visayan Islands. For the Panay-Guimaras-northern Negros operation, codenamed Victor I, he assigned General Brush’s 40th Division, excluding the 108th Regiment, which had recently been assigned to Leyte. The 40th Division departed Lingayen Gulf on March 15 aboard ships from Admiral Struble’s Task Group 78.3. After a brief stop at Mindoro, they arrived at Panay before dawn on March 18. Following a short bombardment by destroyers, the 1st and 3rd Battalions of the 185th Regiment landed unopposed about twelve miles west of Iloilo, where they were joined by Colonel Macario Peralta’s guerrillas, who already controlled much of the island. The 185th quickly expanded its beachhead against light, scattered resistance and began advancing along the coastal road toward Iloilo in the afternoon, forcing the 170th Independent Battalion to retreat to the mountainous interior. With Iloilo secured by March 20, G Company of the 185th Regiment successfully captured Inampulugan Island on March 22, while other elements of the regiment cleared the unoccupied Guimaras Island by March 23. Additionally, Brush decided to assign the 2nd Battalion of the 160th Regiment to garrison Panay alongside Peralta’s guerrillas. No pursuit of the 170th Independent Battalion was made, allowing the Japanese to continue their guerrilla activities until the end of the war.

Meanwhile, for the operation against northern Negros, Brush planned to launch an assault with the 185th Regiment on March 29, followed by the majority of the 160th Regiment the next day, while keeping the 503rd Parachute Regiment in reserve for potential airdrops. Opposing him, Lieutenant-General Kono Takeshi’s 77th Brigade had a total of 15,000 troops but was prepared to retreat into the mountains of north-central Negros for a prolonged defense, leaving only token forces in the coastal plain to delay American advances. On March 29, the 185th Regiment landed unopposed near Pulupandan and quickly secured a bridge over the Bago River. The 185th then spread north and east, with the 160th Regiment following, successfully securing nearly the entire coastal plain of northwestern Negros by noon on April 2. As they closed in on Kono's inner fortress, the Americans overran the main Japanese outposts while the 511th was landed to bolster the assault. On April 9, Brush launched his general offensive, with his three regiments advancing slowly into rugged terrain where the Japanese held significant defensive advantages. 

On June 4 General Kono, realizing that his remaining forces were incapable of further sustained effort, directed a general withdrawal deep into the mountains behind his broken defensive lines. The surviving Japanese dispersed into small groups seeking food and hideouts and trying to avoid contact with Colonel Abcede's guerrillas who, under the direction of the 503rd Parachute Regiment, took over responsibility for the pursuit of Kono's men. On June 9 the 503rd then relieved all elements of the 40th Division in northern Negros. By that date the Japanese had lost over 4000 men killed. Kono lost another 3350 troops, mainly from starvation and disease, before the end of the war. After the general surrender in August 1945, over 6150 Japanese came down from the mountains to turn themselves in, joining about 350 others who had been captured earlier. In all, about 7100 Japanese lost their lives in northern Negros, pinning down the equivalent of an American infantry division for over two months. The 40th Division's casualties for the operation, including those of the attached 503rd Parachute, totaled approximately 370 men killed and 1035 wounded. Meanwhile, Eichelberger’s final objective in the Central Visayas was Cebu, assigned to Major-General William Arnold’s Americal Division. For Operation Victor II, Captain Albert Sprague’s Task Group 78.2 was set to land the bulk of the division at Cebu City while Colonel James Cushing’s guerrillas secured the water sources.

Opposing them were Rear-Admiral Harada Kaku’s 33rd Naval Special Base Force and Major-General Manjome Takeo’s 78th Brigade, which together comprised approximately 14,500 troops, including the 173rd Independent Battalion and the 36th Naval Guard Unit stationed at Cebu City. Additionally, around 750 soldiers from General Kataoka’s 1st Division were positioned in northern Cebu. Although the command situation on the island was chaotic, General Suzuki’s 35th Army headquarters in Leyte had been evacuated by two large motorized landing barges between March 17 and 25. Taking control of all forces on Cebu, Suzuki appointed Manjome as the de jure commander in the Cebu City area while leaving Kataoka in charge of northern Cebu, as he prepared to retreat to Mindanao.

General Manjome designed his defenses so as to control--not hold--the coastal plains around Cebu City, and for this purpose set up defenses in depth north and northwest of the city. A forward line, constituting an outpost line of resistance, stretched across the first rising ground behind the city hills 2.5 to 4 miles inland. A stronger and shorter second line, the main line of resistance, lay about a mile farther inland and generally 350 feet higher into the hills. Back of this MLR were Manjome's last-stand defenses, centering in rough, broken hills 5 miles or so north of the city. Anticipating that American forces would attempt to mount wide envelopments of his defensive lines, Manjome set up one flank protective strongpoint in rugged, bare hills about 3.5 miles north of barrio Talisay, on the coast about 6 miles southwest of Cebu City, to block the valley of the Mananga River, a natural axis of advance for forces enveloping from the south and west. Similarly, he established strongpoints on his left to block the valley of the Butuanoan River, roughly 4 miles northeast of Cebu City. Against the eventuality that the American invading forces might land north of Cebu City and strike into the Butuanoan Valley, Manjome set up another flank protective position in low hills overlooking the beach at Liloan, 10 miles northeast of Cebu City. Manjome did not intend to hold the beaches, but at both Talisay and Liloan, the best landing points in the Cebu City region, he thoroughly mined all logical landing areas. The Japanese also constructed tank barriers along the shore line and planted tank traps and minefields along all roads leading inland and toward Cebu City. The inner defense lines were a system of mutually supporting machine-gun positions in caves, pillboxes, and bunkers. Many of these positions had been completed for months and had acquired natural camouflage. Manjome's troops had an ample supply of machine guns and machine cannon and, like the Japanese on Negros, employed remounted aircraft and anti-aircraft weapons. Manjome had some light and heavy mortars, but only a few pieces of light artillery. For the rest, however, Manjome's forces were far better supplied than Kono's troops in northern Negros.

After an uneventful journey, Task Group 78.2 and the Americal Division arrived off Cebu in the early hours of March 26. Following an hour of bombardment by three light cruisers and six destroyers from Admiral Berkey's Task Force 74, the leading waves of the 132nd and 182nd Regiments landed unopposed on beaches just north of Talisay at 08:30. However, the landing was chaotic, as Japanese mines just a few yards beyond the surf line disabled ten of the first fifteen LVTs. Fortunately for the Americans, Manjome had chosen to withdraw from the beaches to establish inland defenses, resulting in minimal casualties. Once they cleared the beach minefields by 10:00, Arnold’s leading units cautiously advanced through abandoned defenses toward the main highway to Cebu City, ultimately stopping for the night about a mile and a half south of their objective. The following day, the infantry secured Cebu City without opposition and on March 28 proceeded to clear Lahug Airfield and Hill 30 to the north.

The Americans began their assault on Go Chan Hill on March 29, during which Company A of the 182nd Regiment was completely annihilated by the explosion of an ammunition dump located in caves along the hill's eastern spur. Fueled by a desire for revenge, nearly the entire 182nd returned to the attack on March 30 and successfully captured Go Chan Hill. Meanwhile, the 132nd Regiment cleared the coastal plains area north to the Butuanoan River, further securing the city's water supply sources by April 2. Unopposed, troops from the 132nd also successfully landed on Mactan Island, quickly securing an airstrip. In the meantime, as guerrillas had already taken control of much of Masbate, the 2nd Battalion of the 108th Regiment successfully landed on the island by April 7. Facing minimal opposition, the Americans pursued the scattered Japanese remnants through the hills and jungles of Masbate, killing approximately 120 Japanese soldiers by May 4.

 

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On March 29th, the Americans attacked Go Chan Hill, suffering heavy losses. Seeking revenge, they captured it the next day, securing water supplies and defeating Japanese forces in Masbate. Then in April, Allied forces advanced strategically, overcoming fierce Japanese resistance, securing key positions, and establishing airfields, culminating in significant victories across the Philippines.