- 162 - Pacific War Podcast - Victory at Leyte - December 24 - 31 - , 1944

The Pacific War - week by week

Last time we spoke about the third arakan campaign. In December, General Bruce’s forces advanced through Leyte, securing Ormoc and preparing for a decisive push toward Valencia.. The 305th and 306th Regiments steadily overcame enemy positions, while the 307th secured the airstrip. As Japanese forces began to retreat, the 12th Cavalry captured Kananga, opening Highway 2. Meanwhile, in Burma, General Slim devised Operation Extended Capital, aiming to outmaneuver the Japanese and cut off their supply lines, setting the stage for a crucial battle. As Admiral Mountbatten pivoted from Operation Dracula to launch Operation Romulus in Arakan, General Christison devised a three-pronged assault on Akyab. Facing fierce Japanese resistance, Private Kweku Pong displayed extraordinary bravery amidst chaos, earning recognition for his valor. Meanwhile, the 28th Army struggled to defend its positions, ultimately retreating under pressure. Amidst strategic deceptions, the Allies advanced through challenging terrain, culminating in significant victories that shifted the tide in Burma, showcasing courage and tactical ingenuity in the face of adversity.

This episode is the Victory at Leyte

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.

As we last left off, General Krueger’s forces had effectively secured the Ormoc Valley, prompting many Japanese units to begin a challenging retreat toward Palompon. From that point, the best General Suzuki’s troops could manage was to hold their positions for as long as possible. The Japanese had pockmarked Matagob and the area surrounding it with foxholes and emplacements and had dug spider holes under the houses. South of Matagob, where the road climbed into the hills, the enemy had utilized natural caves, gullies, and ridges on both sides of the road and dug many deep defensive positions. Some of these were eight feet deep, two feet in diameter at the top, and widened to six feet at the bottom. The Japanese had emplaced machine guns in culverts and had constructed several well-camouflaged coconut log pillboxes on the forward slopes of the ridges. An excellent, almost invisible installation, which served as an observation post, was dug in on the forward slope of a ridge about three miles north of San Miguel. It had a concealed entrance on the reverse slope. From this post eight miles of the road to the north and east could be observed.

Meanwhile, eager to deliver a decisive blow, Krueger organized his forces for a four-division assault along a wide front toward the west coast. General Bruce’s 77th Division was tasked with advancing west along the Palompon road, while the three divisions of General Sibert’s 10th Corps embarked on a difficult trek across the mountains to reach the northwest coast. The northwestern mountains of Leyte west of Ormoc Bay provided a difficult barrier to any movement toward the northwest coast. The area was the last one available to the Japanese either for escaping from Leyte or for staging defensive actions. In general, the terrain was rough, increasing in altitude from broken ground and low hills in the north to steep rocky ridges and high hills in the south. The northern part was either under cultivation or covered with cogon grass. Toward the south, the cultivated fields and grasslands were gradually supplanted by dense forests. Palompon had been extensively used by the Japanese as an auxiliary port of entry to Leyte. The town was the western terminus of the road that ran north and eastward across the northwestern hills to join Highway 2 near Libongao. It was this road junction that the 10th and 24th Corps had seized. The Palompon road, as it was called, followed the lower slopes of the hills until the flat interior valley floor was reached. The confining hills were steep-sided with many knife-edged crests. Such was the area into which the forces of the 6th Army had driven remnants of the Japanese 35th Army.

To facilitate the capture of Palompon, Bruce planned to land the 1st Battalion, 305th Regiment near the port, while the other two battalions advanced westward on the Palompon road. To support this operation, Admiral Kinkaid would provide amphibious vehicles, LCMs, and a PT escort. However, while preparations for the amphibious assault were underway, the 2nd and 3rd Battalions of the 305th Regiment departed from Valencia on December 22, quickly crossing the Togbong and Pagsangahan Rivers without encountering any opposition, and eventually halting just beyond the Humaybunay barrio.

The 302nd Engineer Battalion, which followed behind the assault battalions, fought the "battle of bridges." The engineers worked around the clock, frequently without any infantry protection, to restore the bridges as soon as possible. The bridges were to be sufficiently strengthened initially to support 2.5-ton truck traffic for infantry supply, then they were to be reinforced to carry 20 tons in order to bring M8's forward, and eventually to 36-ton capacity to carry the M10's. General Bruce had hoped that sufficient Bailey bridges could be made available for important crossings to carry traffic while engineers built wooden bridges under the Bailey bridges. Only a limited number of Bailey bridges were furnished, however, and engineer progress to the west was slowed down. At the same time, patrols from the 128th Regiment successfully eliminated the last enemy strongholds in the Limon area, while the 127th Regiment advanced to Lonoy, where the 1st Cavalry Division was gearing up for its westward push. Finally, the 24th Division, now under Major General Roscoe Woodruff, dispatched the 34th Regiment to launch an attack toward Tuktuk.

On December 23, as aircraft bombed Palompon, the 2nd and 3rd Battalions of the 305th Regiment resumed their advance. The Americans steadily progressed along the road, successfully forcing the Takahashi Detachment to retreat to the mountains northwest of Matag-ob, where they had to fend off a series of strong night counterattacks. That same morning, the assault units of the 1st Cavalry Division moved out from the highway, facing no resistance as they advanced west through the mountains. This initial day of marching established the pattern for the following days, with the cavalry regiments continuing to push forward through challenging terrain, encountering only sporadic resistance. Additionally, from December 23 to 26, the 34th Regiment conducted extensive patrols along the west coast of the Leyte peninsula. Meanwhile, the advance echelon of the 1st Division successfully linked up with the 68th Brigade, reaching the Bagacay sector the next day. However, the main body of the division had to carve its way through dense jungle on its way to Bagacay. The 102nd Division was also advancing toward the area south of Matag-ob, but after failing to make contact with the 35th Army or the Takahashi Detachment, its units began to retreat to Villaba in the following days. On December 24, while the 1st Battalion was boarding at Ormoc, the remainder of the 305th Regiment launched another offensive. At 1000 on 24 December the assault troops jumped off. The Japanese resistance was light and intermittent, but American progress was slow because of the rough, irregular hills in which the enemy had established positions in foxholes, spider holes, and caves. Since it was not possible to bypass these positions, the regiment had to clear each one before the advance could continue. The force received some artillery fire but a mortar platoon from Company A, 88th Chemical Weapons Battalion, silenced the enemy guns. At 1500 the battalions set up their night perimeter 500 yards short of the road bend. During the night a Japanese force of twenty men, which tried to penetrate the defenses of the 3d Battalion, was killed. Both the 127th and 128th Infantry Regiments sent out patrols on December 23 to reconnoiter the terrain. At 08:00 on December 24 the two regiments started for the west coast. Throughout the march to the sea, they encountered only small parties of the enemy, who put up no effective resistance, but heavy rains, dense, almost impassable forests, and steep craggy hills slowed the advance. The commanding officer of the 127th Infantry said of the hills encountered on December 24: “The morning was spent in climbing to the top of a mountain ridge. The climbing was difficult but as we later found out, the descent was much worse. The trail led almost perpendicular down the side. After reaching the bottom, another ridge was encountered, this almost straight up, everyone had to use hand holds to pull themselves up. All in all there were seven ridges from the bottom of the first descent to the first possible bivouac area.” The hills were less rugged from then on. Throughout the march both regiments also received supplies by airdrop, which was not completely satisfactory since none of the drops was made at the requested time and frequently there was a wide scattering of supplies.

On December 25, the 1st Battalion of the former unexpectedly came across the remnants of the 1st and 57th Regiments. The Japanese forces suffered significant casualties and were compelled to disperse, but they eventually managed to reach Bacacay later that night. Meanwhile, the 305th Regiment made slow progress along the Palompon road against a well-entrenched enemy. However, the crucial development was that its 1st Battalion successfully landed at Buaya without facing any opposition.

A light fast armored column moved north to clear the road and to forestall any Japanese counterattack from that direction as the rest of the task force went rapidly south through the barrio of Look to Palompon, which fell at 1206. This closed the last main port of entrance on the island to the Japanese. Within four hours after hitting the beaches the battalion had secured the barrios of Buaya and Look as well as Palompon, and had strong patrols operating to the northeast and south. The troops met no opposition at any point. It was doubtless with great satisfaction that General Bruce sent the following message to the Commanding General, 14th Corps: "The 77th Infantry Division's Christmas contribution to the Leyte Campaign is the capture of Palompon, the last main port of the enemy. We are all grateful to the Almighty on this birthday of the Son and on the Season of the Feast of Lights." The 1st Battalion occupied a defensive position in the vicinity of Look on 25 December, and rested on 26 December, which was Christmas Day back home. It spent the next five days sending out patrols and awaiting the arrival through the mountains of the rest of the 305th Infantry.

Once again, Suzuki's plans were thoroughly disrupted. Palompon was to have been used as the rear center of the line of communications and the army headquarters was to have been established at Kompisao, but the seizure of Palompon on 25 December by the 77th Division forced Suzuki to change the location of his army headquarters. He then selected as a base of operations an area in the vicinity of Ginabuyan that overlooked Silad Bay and was about three kilometers north of Villaba. The new area was a plateau with an elevation of about 1,200 feet, heavily forested and having rocky eastern and western slopes that made it "a natural fortress." From it one could command a view of Ormoc Valley to the east and the Camotes Sea and Cebu to the west. There were a few Filipino huts, and cultivated fields and coconut groves, interspersed with salt beds, lay along the beach. The area "was admirably suited for an extended period of defensive action." General Suzuki ordered the units of the 35th Army that were retreating westward to repair to the vicinity of the new base of operations.

He sent orders for his retreating units to gather there instead of in Palompon. Although Suzuki anticipated being able to support 15,000 men in this self-sufficient area, an assessment of the available resources revealed that they would only last for two weeks. Consequently, the Japanese began preparations for Operation Chi-Go, which involved the amphibious movement of several units, including the 35th Army headquarters and the majority of the 1st Division, to other islands in the Visayas. At the same time, on December 26, the 34th Regiment received orders to capture San Isidro. The next day, its 1st Battalion left Calubian and moved to the high ground overlooking the port, while Companies F and G conducted amphibious landings at Gigantangan Island and Taglawigan before securing Daha. The reinforced Company G then re-embarked on the landing craft and proceeded toward the San Isidro Bay area, where they encountered heavier resistance than anticipated and were ultimately forced to retreat.

At the same time that the 2nd Battalion, 305th Regiment was being withdrawn for an overwater movement to Palompon, the 3rd Battalion continued its advance along the road, successfully covering over 1,000 yards by December 28. That day the foremost elements of the 5th and 12th Cavalry Regiments broke out of the mountains and reached the barrio of Tibur on the west coast, about 2,800 yards north of Abijao. By nightfall on the following day, the 7th Cavalry was also on the west coast but farther north. In its advance it had encountered and destroyed many small, scattered groups of the enemy, most of whom showed little desire to fight. The regiment arrived at Villaba, two and one-half miles north of Tibur, at dusk, and in securing the town killed thirty-five Japanese. Additionally, the 34th Regiment launched a coordinated assault on San Isidro, successfully overcoming all enemy resistance and capturing the port. In the following days, the troops moved south along the coast, eliminating small, poorly equipped Japanese units. Looking south on December 29, the 128th Regiment reached the high ground overlooking Tabango and Campopo Bays, while the 127th Regiment secured the high ground overlooking Antipole Point, completing the advance of the 32nd Division. Further south, the 3rd Battalion, 305th Regiment continued its push along the Palompon road despite strong resistance, while Company B secured the barrio of San Miguel.

At 0930 on 30 December the 305th Infantry struck along the Palompon road, the 3d Battalion driving west, and the Provisional Mountain Force attacking east. The Mountain Force encountered only scattered resistance until 0930, when the Japanese, from well-entrenched positions in the precipitous sides of the road at a point about four miles east of Palompon, directed strong machine gun fire along the road. The Mountain Force dug in for the night on high ground overlooking the point at which its advance had been halted. The 3d Battalion succeeded in overcoming the opposition which had halted it the previous day, and pushed forward to a point about 1,000 yards southwest of Tipolo. The Japanese had emplaced artillery on curves in the road and could fire directly on the advancing American troops. Although the 305th Infantry lost one tank to enemy artillery fire, it was able to destroy three 75-mm. guns and capture two others intact. Meanwhile, Company C conducted a reconnaissance in force and executed an amphibious landing at Abijao, advancing 1,300 yards north to establish contact with elements of the 1st Cavalry Division near Villaba. By this time, most of the Japanese forces had successfully regrouped in the Villaba-Mount Canguipot area. Consequently, on December 31, Suzuki launched four strong counterattacks against the forces at Villaba; however, enemy artillery disrupted most of these assaults before elements of the 77th Division arrived to relieve the cavalrymen.

With the westward advance to the coast complete, General Eichelberger’s 8th Army officially took command of all units on Leyte Island, following MacArthur's announcement that organized resistance had ceased. As a result, on January 1, the 77th Division was instructed to relieve the 32nd and 24th Divisions, while the divisions of the 10th Corps moved to staging areas in preparation for upcoming operations. The 8th Army also assumed control of operations on Samar Island, which had similarly been secured against enemy forces. Units from the 1st Cavalry Division had pushed through heavy resistance to reach the strategic Taft-Wright Highway that runs through central Samar. On December 8, the cavalry successfully captured Wright, the western end of the highway, and then moved east to connect with friendly guerrilla forces advancing from Taft on the opposite coast, thereby securing control of the highway. Meanwhile, following the successful invasion of Mindoro, American forces continued their efforts on Hill Drome and Ellmore Field, with General Dunckel’s troops conducting extensive patrols to locate enemy stragglers while awaiting the arrival of the 21st Regiment. The only opposition faced came from the persistent assaults of the 4th Air Army and the 1st Combined Base Force. On December 21 and 22, the 1st Resupply Echelon was attacked by enemy aircraft. About twenty kamikazes attacked the convoy, so damaging two LST's that they later had to be abandoned, and inflicting lesser damage on two destroyers and a Liberty ship. The 3d Battalion, 21st Infantry, en route to Mindoro in this convoy lost 6 men killed and 32 wounded; U.S. Navy losses were about 70 men killed or wounded; the Japanese lost 7 planes in kamikaze attacks and 3 others to shipboard antiaircraft fire. Then, from December 28 to December 30, Task Unit 18.3.15 was also attacked by kamikazes.

Meanwhile, Admiral Okawachi was getting Admiral Shima’s 2nd Striking Force ready for a hit-and-run surface attack on enemy invasion ships near San Jose, known as Operation Rei-Go. However, a proposed counter-landing on Mindoro, which was supported by Marshal Terauchi, Admiral Fukudome, and General Tominaga, faced strong opposition from General Yamashita and his 14th Area Army. The Area Army staff adamantly maintained that it would be impossible to move any sizeable forces to Mindoro but agreed to dispatch a small raiding unit to hamper enemy development of airfields in the San Jose area. On or about 24 December, an order was issued to the 8th Division to organize a task unit for this mission as soon as possible.

Ultimately, a reluctant compromise was reached, allowing a small raiding unit from the 8th Division to be sent to disrupt enemy airfield development in the San Jose region. The raiding detachment was a specially organized provisional unit which included a small number that originally belonged to the Gi-Go Airborne Raiding Unit. It assembled at Batangas and prepared to embark for Mindoro. While this unit was being organized, Shima’s warships left Camranh Bay on December 24. However, as they approached Mindoro on December 26, a lone PBY reconnaissance plane spotted them. In response, 105 aircraft were sent to conduct low-level attacks on the Japanese force.

At 19:40 the first wave of planes found the vessels just offshore. Before the wild engagement was over, the full wing strength had attacked every ship at least once. "When I saw a solid sheet of flame," reported one pilot in describing the AA, "I knew I was over the vessel." While wheeling away from the target, each pilot flashed on his running lights to avoid collision. Some planes landing in the Mindoro blackout for rearming, made as many as three strikes against the enemy vessels. Although PT boats, lurking close to shore, fired torpedoes at the silhouetted Japanese targets, only the destroyer Kiyoshimo went down, and the fleet persisted toward the beachhead, where at 22:40 it fired star shells which began an ineffective 40-minute bombardment. Only one Liberty ship, which had not sought refuge behind Ilin Island as directed, was sunk. Naval gunfire and simultaneous Japanese air attacks caused little damage at Hill, but made it difficult for the airmen aloft to land. With gasoline running short, most of the pilots made as many attacks as possible and then headed through the night and bad weather for Leyte, a flight more dangerous than the Japanese AA had been. When a full count was made, losses during the engagement totaled 26 aircraft. For the force engaged this was a heavy loss, but it was not in vain, for several Japanese survivors attributed the amazingly poor bombardment by their fleet to the aerial clawing which had demolished main batteries and killed a majority of the gun crews. Dunckel thought that without a doubt the airmen had saved the beachhead from serious losses: "The action of our Air Units on that night," he wrote, "will stand forever… as one of the most gallant deeds to be established in the traditions of American fighting men."

On 26 December 1944, then with the San Jose bombardment force, Kiyoshimo was crippled by two direct bomb hits in attacks by U.S. Army bombers during the approach to Mindoro, Philippines. The ship was then finished off by a torpedo from U.S. PT-223, 145 miles south of Manila ; 82 were killed and 74 injured. The destroyer Asashimo rescued 169 survivors, including ComDesDiv 2, Captain Shiraishi Nagayoshi, and Lieutenant Commander Kajimoto; U.S. PT boats rescued five others.Despite this, Shima pressed on toward his target, entering the anchorage area at 23:00 to commence bombardment of San Jose. After approximately forty minutes of shelling, during which one auxiliary vessel and a PT boat were sunk, the Japanese ships withdrew northwest at high speed, still under fire from enemy planes. Although Shima’s force ultimately managed to escape, the air attacks resulted in the sinking of the Kiyoshimo and damage to the Ashigara, the light cruiser Oyodo, and three destroyers, with a loss of 26 aircraft. The bombardment prevented landings at the Mindoro strips and many pilots, finding their planes running low on fuel, headed through the darkness and heavy weather toward Leyte fields only to crash on the way. Following this unsuccessful operation, on December 31, the raiding unit from the 8th Division finally crossed the Verde Island Passage by landing craft to reach Calapan in northeastern Mindoro, and then proceeded to Pinamalayan, arriving there on January 5. We must now depart from the Philippines and proceed to Bougainville to report on the preparations for a new Australian offensive.

Previously, we observed that General Savige’s 2nd Corps had successfully relieved the American troops stationed at the Cape Torokina perimeter. The Australians had now reached the conclusion that the Japanese had disbanded depleted units to reinforce others and were maintaining a well- disciplined and efficient force. They decided that, at the end of November, the force included the 38th Independent Mixed Brigade, built round the 81st Regiment, and the 6th Division with three depleted infantry regiments -13th, 23rd and 45th. Of these the 38th Brigade was believed to be chiefly concentrated at Numa Numa, with part of the 81st Regiment forward on the trail; most of the 13th Regiment was believed to be round the Jaba River-Gazelle Harbour area, with the 23rd farther south, and the 45th round Kieta on the east coast. The Allied Intelligence estimates of the whereabouts of the main Japanese forma- tions on Bougainville proved accurate. The main shortcoming was that the strength of the naval troops was underestimated. At the time of the arrival of the Aus- tralians there were about 11,000 naval men, including 3,500 civilian workers, on the island; the 87th Garrison Force, about 4,000 strong, was in the Buka area, and in the south were two strong forces of marines: the 6th Sasebo Special Naval Landing Force (about 2,000) and the 7th Kure Special Naval Landing Force (about 1,500). Indeed the naval forces were about as strong in fighting men as the 6th Division. The successful attack on Little George by the 9th Battalion on 29th November, six weeks before it was expected, surprised the enemy commanders and convinced them that the Australians were determined to open an offensive. Reinforcements numbering 450 were hurried into the central area (there were 2,000 troops deployed in or forward of Numa Numa) and Colonel Kaneko Atsushi of the 81st Regiment took command. A further 1,000 troops were sent from Kieta and the north to Numa Numa. Hyakutake was convinced that the attack on the Numa Numa trail would be accompanied by a landing at its eastern end with the object of severing his force. The quantity of artillery used in the attack on Little George and later Arty Hill convinced the Japanese that a determined thrust was being made. Arty Hill was defended by men of the 5th and 11th Companies of the 81st Regiment. Meanwhile the 13th Regiment was attacked on the Jaba River. Lieut-General Kanda of the 6th Division did not propose to contest the south bank of the river, considering that the crossing was merely a feint and the principal offensive would be made by sea; the main body of the defending force-1,500 men-was retained in the Mosigetta area. By January Kanda estimated that one Australian division, its name yet unknown, was south of the Jaba, with 25 guns.

From 23rd to 26th November the 9th Battalion, with the 12th Field Battery and other detachments under command, took over this sector. The 9th Battalion's first task was actively to reconnoitre the Sisivie area with a view to attacking it later; and to secure ground from which such an attack could be launched. It had been believed that the main supply route from Numa Numa passed through Sisivie, but captured docu- ments and interrogation of prisoners revealed that Sisivie was merely an outpost and that the Piaterapaia area was the terminus of the enemy's line of communication; consequently the battalion's efforts were con- centrated in that direction. At 1.50 p.m. on the 24th one rifle shot was fired from Little George into the battalion's area the first shot in the Australian operations on Bougainville. On the 25th a small patrol moved stealthily to the rear of Little George and was fired on, two men being wounded. On the morning of the 29th the battery in the Doiabi Valley fired high-explosive and smoke shells on to Arty Hill, mortars fired smoke bombs on to Little George, and into the smoke a single platoon attacked. At the run the men reached the top of Little George before the Japanese emerged from shelter, opened fire with machine-guns and threw grenades. The attackers did not falter but worked their way forward in pairs, one man firing on a post while the other moved close and threw in grenades. Lieutenant Deacon, the commander, was 3 wounded but carried on. In about half an hour the position was gained. Two Australians had been killed and six wounded, of whom three remained on duty. Twenty Japanese dead lay on the hill, in- cluding a lieutenant and a sergeant. The expected enemy counter-attack was made in the evening by about 40 Japanese. It was a frontal thrust and gained no ground. Until dawn the enemy tried in vain to infiltrate.

While these operations were in progress on the Numa Numa trail, the 2/8th Commando, next on the right, had taken over responsibility for the tangled mountain area rising to an altitude of 4,000 feet south and south-east of Mount Bagana, and known as the Hanemo sector. When the commando squadron took over from a company of the 164th American Regiment there had been no contact with the enemy for several weeks, and it was believed that only a handful of Japanese were in the neighbourhood. For five weeks from 24th November, when the relief was completed, a commando troop patrolled but met Japanese only twice, killing two and capturing another. By 27th December, when the 61st Battalion relieved the troop, it was considered that the area was clear and the flank of a force advancing down the coast would be safe.

Additionally, Brigadier Raymond Monaghan’s 29th Brigade was deployed to the southwestern edge of the perimeter, and a company from New Guinea was assigned to scout the Jaba River area. On December 3, Matthews sent a platoon to Sisivie, but the defenders were able to pin down the Australians with intense fire. After successfully repelling a strong enemy counterattack, the 9th Battalion advanced on Bawabu Ridge toward Pearl Ridge, with Matthews’ C Company ordered to capture Arty Hill on December 18.

Matthews planned an attack on Arty Hill by a full company. At 7 a.m. on 18th December Major Blanch's C Company formed up on the sheltered side of George and Little George, on top of which men of a supporting company were walk- ing about nonchalantly to mislead the enemy into thinking that it was to be another uneventful day. Twelve New Zealand Corsairs at- tacked the Japanese positions; the battery of the 4th Field Regiment opened fire from its positions in the Laruma River Valley; medium machine-guns fired from Mount Deacon and Bawabu Ridge that is, from each flank-on to the reverse slope of Arty Hill at ranges up to 1,000 yards. After thirteen minutes of bombardment, the attackers advanced through the smoke along the razor-back ridge which was the only means of approach to the bare hill. Months of intermittent shelling had destroyed the bush and so loosened the soil on the steep slopes that the men had difficulty in scrambling up them. By 8.10 the leading troops were near the crest of Banyan Knoll and were meeting sharp small arms fire from Japanese in covered weapon-pits. Grenades were hurled down on them. They pressed on. Sergeant Allan, commanding the right platoon, led the way to the top of Banyan Knoll, shot a Japanese machine-gunner and himself fell dead. His men carried on up the slopes of Arty Hill. As at Little George, the attackers worked in pairs, one man covering an enemy post with fire while the other attacked from a flank with grenades. After more than an hour of close fighting the position was won and the defenders were digging in and setting up wire in preparation for the probable counter-attack. There was none: a prisoner said that there were not enough men left to attack. Five Australians were killed and 12 wounded of whom 4 remained on duty. Twenty-five Japanese dead were counted, 2 Japanese were taken prisoner, and from 10 to 20 recently-buried bodies were found. Two days later, Lieutenant-Colonel John McKinna’s 25th Battalion began to relieve the exhausted 9th Battalion and was immediately tasked with taking Pearl Ridge, although its initial probing attacks were met with fierce resistance from the determined defenders. Meanwhile, Monaghan had deployed Lieutenant-Colonel Herbert McDonald’s 15th Battalion to the Jaba River area, where they effectively cleared out enemy outposts.

By the fourth week of December, the unofficial ceasefire on Bougainville had collapsed. Intense fighting erupted in two of the three main sectors, resulting in the deaths of over 100 Japanese soldiers, with their forward positions in each area being captured. The Australians were also bringing in additional reinforcements to sustain their offensive. According to Savige’s strategy, Brigadier John Field’s 7th Brigade was to be replaced by elements of Brigadier John Stevenson’s 11th Brigade in the central sector, with orders to move south and join the rest of Major-General William Bridgeford’s 3rd Division for an assault toward the Puriata River. Additionally, a strong contingent from the 11th Brigade was set to advance along the northwest coast of the island toward Soraken Harbour, aiming to push the northern enemy forces into the confined Bonis Peninsula. However, before these plans could be executed, McKinna was intent on capturing Pearl Ridge and aimed to launch one final attack with all his companies by the end of the month. Unbeknownst to the Australians, the few defenders in the area had recently received reinforcements in the form of a battalion under the direct command of Major-General Kijima Kesao, which significantly strengthened the ridge. Nevertheless, on the morning of December 30, aircraft bombarded the Japanese positions for about 40 minutes. At 08:00, the infantry advanced under the cover of artillery and machine-gun fire, with A Company facing heavy resistance just in front of Pear Hill that they could not overcome. Due to this setback on the right flank, McKinna ordered D Company to undertake a challenging climb along Pear Hill instead of the narrow spur where the attack had failed. Meanwhile, C Company made slow progress through dense brush but eventually managed to cut the enemy's track to the west.

After repelling several enemy counterattacks during the night, the four companies renewed their assault on December 31. Although the march over Arty Hill and through thick underbrush was physically demanding, D Company managed to approach Pear Hill undetected. With A Company drawing enemy fire, D Company launched a powerful attack following an artillery bombardment that successfully pushed back the Japanese defenders. Meanwhile, B Company captured Baker’s Brow to the west, and C Company held its position along the western track. However, by nightfall, Kijima’s troops began testing the defenses established by C Company. In the early morning, the Japanese launched a fierce counterattack from the south and southeast, managing to penetrate two forward Australian positions. After an hour of intense hand-to-hand combat, the assault was ultimately repelled with the help of artillery support, and Australian patrols later found that Pearl Ridge had been abandoned by the enemy. Throughout the morning and into the early afternoon, the Australians conducted mopping-up operations until the ridge was completely cleared. With control of Pearl Ridge secured, the Australians gained a strategic vantage point that allowed them to observe from one side of Bougainville to the other, aiding future operations. During the battle, the Australians suffered 10 killed and 25 wounded, while the Japanese lost 34 killed and 1 captured. Shortly after taking Pearl Ridge, the 11th Brigade assumed control of the central sector as per Savige's orders, while the rest of the 7th Brigade began moving south.

In conclusion, Major-General Percy Clarkson’s 33rd Division began its deployment to Morotai in late December, with Colonel Ray Cavenee’s 136th Regiment landing on the island's west coast on December 22. Four days later, the regiment advanced into Japanese-controlled territory to engage Colonel Kisou’s 211th Regiment, receiving support from elements of the 130th Regiment moving overland from the Doroeba Plain and the 3rd Battalion of the 137th Regiment marching from Morotai's southern coast into the interior. This coordinated effort aimed to prevent the Japanese from dispersing into smaller groups in the island's mountainous regions. On January 3, the 136th Regiment located and attacked the 211th Regiment at Hill 40, with the 1st and 2nd Battalions advancing from the southwest while the 3rd Battalion approached from the north. After two days of intense combat, the Americans successfully captured Hill 40, inflicting significant casualties on the enemy, and then began pursuing the retreating Japanese forces to the north. Two thousand yards to the north, the 3d Battalion was settling down for the night. Its march from Radja had started badly. From the beginning the battalion had been harried by the enemy. On the nights of December 26-27 and 27-28, its perimeter had been attacked viciously by an estimated enemy battalion. (The 3d Battalion of the Jap 211th Infantry. It had been detached from the 211th for a special mission to Radja to await and guide reinforcements from Halmahera. The five reinforcing barges were ambushed after slipping through the Navy PT screen, and were destroyed along with fifty tons of food and supplies.) The battalion had experienced the hardest march of its history. The jungle was more difficult than that encountered by the Pilowo column. Moreover, to join the Hill 40 battle it had to abandon trails for cross-country movements. Although the battalion had marched and fought its way forward for ten days it was still in fighting trim. The number of Japs killed and found buried along the trail indicated terrible losses for the Japs. The battalion commander, Major Ralph Pate, attributed the lack of enemy resistance during the past two days to the withdrawal of the enemy. Actually, as he learned later, the 3d Battalion, Jap 211th Infantry Regiment, had been destroyed as a military force. By January 14, when the 136th Regiment was finally withdrawn to the main perimeter, the Americans reported having killed 870 Japanese soldiers and captured 10, suffering 46 men killed and 127 wounded in the process.

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General Krueger's forces captured Palompon, disrupting Japanese plans, while American troops advanced through challenging terrain, overcoming resistance and securing key locations. Japanese forces planned a counter-landing on Mindoro, but faced fierce opposition. Meanwhile, Australians advanced on Bougainville, capturing strategic positions amid heavy fighting.