- 151 - Pacific War Podcast - The Formosa Air Battle 10 - October 17 - , 1944

Last time we spoke about the conquest of Angaur and the Japanese Triumph in China. By October 18th, the remaining Japanese on Angaur were compressed into a small area, and by the 21st, resistance had ceased. The Americans suffered 264 killed and 1,355 wounded, while approximately 1,300 Japanese were killed. Over in China, Hara's forces suffered heavy losses during a delaying action at Momauk, with troops joining Bhamo's defense by November 16. The 113th Regiment maneuvered to encircle Bhamo from the south, while the 114th Regiment approached from the north, creating a loose encirclement. The 22nd Division's movement prompted concerns of severing key rail lines, leading Japanese forces to reposition defensively. Despite intense fighting, including a strong Chinese offensive on November 19, the Japanese withdrew from key positions, allowing Chinese forces to capture Mangshi and secure a strategic airfield for resupply, significantly impacting the campaign's dynamics.

This episode is the Formosa Air Battle

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 saw on Peleliu, General Rupertus' 1st Marine Division, bolstered by Colonel Dark's 321st Regiment, successfully secured the island after approximately two weeks of intense fighting. However, Colonel Nakagawa's isolated and outnumbered garrison continued to resist in the Umurbrogol Pocket. As left by nature, the Umurbrogol Pocket was much like the Ibdi Pocket on Biak Island, but larger and rougher. Like Ibdi, the Umurbrogol originally had a thick cover of tropical trees and dense jungle undergrowth which, as the result of continued air, naval, and artillery bombardment (including extensive employment of aerial napalm strikes), was gradually knocked down or burned away. Again, as on Biak, the Japanese had improved upon nature. There were many artificial or semi-artificial caves which had been constructed to protect approaches to the inner sections of the pocket, and the Japanese had improved almost every natural cave. Where no caves were available or could be constructed, the defenders employed rock faults and crevices for defensive positions. Digging new entrances to existing caves or even cutting new levels within some caves, the Japanese were well prepared to execute a long and bloody holding action along the many ridges. These ridges, with the exception of the Five Sisters group at the southern side of the pocket, were generally parallel and oriented north-northeast to south-southwest. Steep-sided and fissured, many of them had razor-back summits upon which no cover could be found. The ridges were separated by deep draws, gullies, and wider valleys, the floors of which were strewn with coral boulders or coral outcroppings similar to stalagmites. Steep as they were, the sides of some ridges also were covered with such chunks and outcroppings.

In late September, the exhausted infantrymen, who were tasked with containing the pocket while the Marines cleared northern Peleliu, made several heavy assaults. They only managed to reach the X-ray phase line, marking what was believed to be the northern edge of the core Japanese defenses, before being relieved by the 7th Marines. With Colonel Hanneken's 1st and 3rd Battalions now holding the X-ray line, Rupertus planned a strong attack southward while other Marine units maintained their positions on the western and southern sides of the pocket. On the morning of September 30, the attack was launched. However, fierce Japanese resistance, heavy rain, fog, and sickness hindered the 7th Marines' progress southward by October 2. On the following day, Hanneken's 2nd Battalion, supported by tanks, secured a foothold along the eastern side and top of Walt Ridge, while the 3rd Battalion finally captured the eastern slope of Boyd Ridge. By October 4, however, the 7th Marines had suffered such heavy losses and were so depleted that Rupertus was left with no choice but to relieve them as well.

As a result, Colonel Harris’s 5th Marines were once again thrust into action. On October 7, following an hour-long artillery and mortar barrage, the 3rd Battalion, along with six tanks, advanced into Mortimer Valley. However, Nakagawa’s determined defenders continued to resist fiercely, successfully repelling two powerful tank-infantry assaults, causing heavy American casualties. Our old friend Eugene Sledge with K Company, 3d Battalion, 5th Marines, wrote about fighting in this area, it is as follows 

“Johnny led us on up through a jumble of rocks on Hill 140. Company K's line was emplaced along a rock rim, and we set up the mortars in a shallow depression about twenty yards behind it. The riflemen and machine gunners in front of us were in among rocks along the rim of Hill 140 facing east toward Walt Ridge and the northern end of the infamous Horseshoe. We had previously attacked that valley from its southern end. From the rim of Hill 140 the rock contours dropped away in a sheer cliff to a canyon below. No one could raise his head above the rim rock without immediately drawing heavy rifle and machine-gun fire. The fighting around the pocket was as deadly as ever, but of a different type from the early days of the campaign. The Japanese fired few artillery or mortar barrages, just a few rounds at a time when assured of inflicting maximum casualties. That they usually did, and then secured the guns to escape detection. Sometimes there was an eerie quiet. We knew they were everywhere in the caves and pillboxes. But there was no firing in our area, only the sound of firing elsewhere. The silence added an element of unreality to the valleys. If we moved past a certain point, the Japanese opened up suddenly with rifle, machine-gun, mortar, and artillery fire. It was like a sudden storm breaking. More often than not we had to pull back, and not a man in the company had seen a live enemy anywhere. They couldn't hope to drive us off by then or to be reinforced themselves. From that point onward, they killed solely for the sake of killing, without hope and without higher purpose. We were fighting in Peleliu's ridges and valleys, in terrain the likes of which most Americans could not even visualize, against an enemy unlike anything most Americans could imagine”.

In response to this setback, Rupertus halted further offensive operations and ordered his forces to maintain pressure on the Japanese stronghold through sustained artillery fire and aerial bombardments. Over the next two days, this relentless bombardment cleared so much foliage and undergrowth that visibility across the ridges improved significantly. This allowed the attacks to resume on October 9, and although no ground was gained initially, Harris’s 2nd Battalion succeeded in securing Wattie, Baldy, and 120 Ridges on October 10. They then pushed south to capture the tactically vital Hill 140. From this position, a Marine howitzer provided critical support to the 5th and 7th Marines as they cleared an area approximately 700 yards long and up to 200 yards east beyond the previous containment lines along West Road. However, on October 14, Dark’s 321st Regiment began moving up to relieve the Marines, as General Geiger had decided to end Marine participation in the Battle of Peleliu. 

Just before they were relieved, Eugene Sledge wrote a passage about moving through positions in October, finding numerous dead, stinking in the hot sun. One corpse he found made a significant impact on him, here is the passage.

“As we moved past the defilade, my buddy groaned, “Jesus!” I took a quick glance into the depression and recoiled in revulsion and pity at what I saw. The bodies were badly decomposed and nearly blackened by exposure. This was to be expected of the dead in the tropics, but these Marines had been mutilated hideously by the enemy. One man had been decapitated. His head lay on his chest; his hands had been severed from his wrists and also lay on his chest near his chin. In disbelief I stared at the face as I realized that the Japanese had cut off the dead Marine's penis and stuffed it into his mouth. The corpse next to him had been treated similarly. The third had been butchered, chopped up like a carcass torn by some predatory animal. My emotions solidified into rage and a hatred for the Japanese beyond anything I ever had experienced. From that moment on I never felt the least pity or compassion for them no matter what the circumstances. My comrades would field-strip their packs and pockets for souvenirs and take gold teeth, but I never saw a Marine commit the kind of barbaric mutilation the Japanese committed if they had access to our dead. When we got back to the gun pit, my buddy said, “Sledgehammer, did you see what the Nips did to them bodies? Did you see what them poor guys had in their mouths?” I nodded as he continued, “Christ, I hate them slant-eyed bastards!” “Me too. They're mean as hell,” was all I could say.”

About mid-October, a number of command changes occurred in the Palaus area. On the 12th, for instance, the 1st Marine Division was relieved of all responsibilities other than continuing the fight in the Umurbrogol Pocket. The 321st Infantry took over the defenses along the eastern arm, while the Island Garrison Force assumed responsibility for the area south of the pocket. On the morning of October 12, the command post of the 3rd Amphibious Corps moved ashore and General Geiger, the corps commander, declared that the assault and occupation phase of operations on Peleliu was ended. The exact meaning of this announcement is not clear, especially in relation to Admiral Fort's somewhat similar declaration of September 30, stating that Angaur, Peleliu, Ngesebus, and Kongauru had been captured and occupied. However, General Geiger's announcement seems to have been made in preparation for the 1st Marine Division's imminent departure from the Palaus. The statement also bears relation to the passing of control of operations in the Palaus from the 3rd Fleet and Admiral Halsey (as then represented by Admiral Fort's Western Attack Force headquarters) to the Headquarters, Forward Area Central Pacific (Task Force 57), under Admiral Hoover. On the 13th General Geiger issued orders alerting the 321st Regimental Combat Team to relieve the 1st Marine Division elements still at the Umurbrogol Pocket. The next day, control over all operations in the Palaus passed from Admiral Fort to Admiral Hoover's command. With the relief of the Marines at the Umurbrogol, the remainder of the battered 1st Marine Division then began preparations for leaving the Palaus. At the same time, the 1st Battalion, 323rd Regiment, fresh from operations at Ulithi Atoll, started preparations to relieve Marine units in the southwest corner of the pocket, with the rest of the regiment to follow. Consequently, the Marines prepared to depart from the Palaus, with Dark taking over responsibility for the reduction of Umurbrogol.

Since September 29, the Marines had endured an additional 1,000 casualties, bringing their total to 1,252 killed and 5,274 wounded. In return, they estimated having killed between 850 and 1,000 Japanese soldiers, leaving roughly 1,000 defenders in the shrinking pocket as the 321st moved back in. After a failed local attempt to capture the northernmost peak of the Five Brothers Ridge on October 16, Dark launched a general attack the next day, which resulted in a modest gain of about 125 yards and the neutralization of some caves to the east. On the morning of October 18, the attack resumed, with Dark’s 2nd Battalion successfully capturing three peaks of the Five Brothers, thanks to support from mortars, tanks, and LVT-mounted flamethrowers. However, undeterred by this overwhelming firepower, the Japanese immediately counterattacked and reclaimed the three peaks by nightfall. On the southwest side of the pocket, Nakagawa had also sent infiltrators through tunnels and connecting caves to raid the enemy lines, forcing Geiger to redirect elements of the 7th Marines and 323rd Regiment to address this new southern pocket. After much effort, most of the infiltrators were finally pushed north on October 23, though mopping up in the Southern Pocket wasn't completed until November 3. Meanwhile, on October 19, following a deadly napalm strike, Dark’s 1st Battalion advanced up to 50 yards along the ridges west of Hill 140 with the help of howitzers and much-needed sandbags. The battalion's men, lying prone on the ground, inched their sandbags forward with rifle butts or sticks, laboriously expanding their hold and almost realizing the infantrymen's dream of portable foxholes.

The next day, General Mueller formally assumed command of the Peleliu campaign. Following some reconnaissance and a napalm strike, the 321st resumed its assault on October 21, making significant progress by advancing over 100 yards and capturing the northernmost peak of the Five Brothers. On the subsequent day, Dark launched a coordinated attack with his 2nd Battalion securing the first three Brothers, the reinforced 1st Battalion struggling to breach Death Valley, and the 3rd Battalion sweeping through Mortimer Valley with tank support. After this achievement, while Colonel Watson was bringing the remaining 323rd Regiment to the Umurbrogol area, the only major progress was the capture of the fourth Brother on October 23. Two days later, the 323rd began relieving the weary 321st Regiment. By this time, Dark had lost 146 men killed and 469 wounded on Peleliu. As Watson took over, Nakagawa's forces had been reduced to about 700 effective troops, including those lightly wounded. The pocket's dimensions had also been compressed to an average north-south length of about 600 yards. Fortunately for the defenders, heavy rains, fog, and poor visibility significantly hampered Watson’s operations in the Umurbrogol Pocket from October 26 to November 1. This period was used mainly for mortar barrages, napalm strikes, defense enhancements, and extending sandbag fortifications. Despite this pause, Nakagawa launched near-nightly counterattacks over the six days, primarily targeting the Five Brothers, which mostly resulted in further casualties for the defenders. To understand the eventual reduction of the Umurbrogol Pocket, we will need to shift our focus to the plans and preparations for General MacArthur's grand return to the Philippines.

Previously, General MacArthur, along with Admirals Nimitz and Halsey, decided to abandon the preliminary operations for Mindanao and Yap in favor of a direct assault on Leyte. To be much more frank General MacArthur was having a turf war with Admiral Nimitz. After the Marianas campaign, the endgame of Nimitz island hoping across the Pacific forced the Joint Chiefs of staff to make a choice, to invade the Philippines, or leave it to wither on the vine and instead invade formosa. Admiral King, the joint chiefs of staff, Admiral Leahy and General Hap Arnold all favored the Formosa option. For quite awhile Nimitz got everyone onboard with this plan as Formosa was a logical choice being only 900 kms away from Japan and its seizure would cut off southeast asia from the home islands. With Formosa the Americans could even begin an invasion of southern CHina to aid their allies there and toss plenty of B-29s at the home islands from a much closer location. But then there was the force of nature that was Douglas MacArthur. MacArthur argued Formosa would be “a massive operation, extremely costly in men and shipping, logistically precarious and time consuming.” And he was willing to take his case straight to Washington. In July of 1944 he along with Nimitz went to Honolulu to meet with FDR. MacArthur bitterly protested the meeting, as he knew full well FDR was trying to get re-elected for a fourth term “humiliation of forcing me to leave my command to fly to Honolulu for a political picture taking junket.” So not to be outdone by FDR, MacArthur showboated, by landing early with. He went to a local shop in a limousine he borrowed, and had his staff place a 4 star general insignia upon. He wore khaki trousers a brown leather air force jacket and the cap of a Filipino Field Marshall, going out into public waving at crowds gathering to see the president. When he moved into a cabin to meet with FDR he refused to change into cooler attire stating to FDR , “you haven’t been up there where I came from, and it’s cold up there in the sky.” MacArthur then pretended Nimitz was not in the room and dominated the strategic discussions and attempted at every possible moment to impose his will on the rather ailing and sickly president, whose physical decline had become more apparent. During a private meeting between the two MacArthur said this to FDR “Mr. President, the country has forgiven you for what took place on Bataan. You hope to be re-elected president of the United States, but the nation will never forgive you if you approve a plan which leaves 17 million Christian American subjects to wither in the Philippines under the conqueror’s heel until the peace treaty frees them. You might do it for reasons of strategy or tactics, but politically, it would ruin you”

Rather ironic given it was his responsibility to defend those he was now blackmailing FDR to save. But the truth of the matter was, MacArthur had stolen the American press and American peoples hearts, his grand statement to return to the Philippines was a huge issue. There of course was the other issue, MacArthur could run on the Republican ticket against FDR. Some would allege FDR was bullied into an invasion of the Philippines because of this. To twist FDR’s arm, MacArthur assured him the losses in retaking Luzon would be minimal “Mr. President, my losses would not be heavy, any more than they have been in the past … your good commanders do not turn in heavy losses.” Despite it being a slight against Nimitz, MacArthur’s arguments did twist his wrist. That evening FDR spoke to his doctor Ross McIntire stating this “Give me an aspirin before I go to bed. In fact, give me another aspirin to take in the morning. In all my life nobody ever talked to me the way MacArthur did.” When leaving back on his plane, MacArthur turned to his aide and boasted, “We’ve sold it.” and when he returned to his South West Pacific Area Command HQ in Brisbane, MacArthur informed his staff, “the President has accepted my recommendations and approved the Philippines plan.”

MacArthur was a bit too optimistic, although FDR agreed to invade the Philippines he did not do so without recommendations of his joint chiefs of staff. The Navy was to bear the brunt of furnishing air support in the early stages of the campaign. By arrangement with Admiral Nimitz, the Carrier Task Force from Admiral Halsey's 3rd Fleet was to strike northern Luzon and Okinawa or Formosa, or both, from A Day minus 10 to A minus 7. From A minus 4 through A Day, strikes were to be made on Luzon, the Cebu-Negros area, and the Leyte area in support of the landings. As soon as the Palau air base facilities would permit, shore-based air forces from the Central Pacific were to operate in the Bicol area. The Allied Naval Forces was to furnish carrier aircraft as protection for convoys and naval task forces and, supplemented by aircraft of the 3rd Fleet and the Allied Air Forces, to provide direct air support for the landings. In addition, it was to furnish protective air support and cover by carrier aircraft prior to A Day for the preliminary landings in Leyte Gulf and for the mine sweeping. On September 24, General Kenney issued his order for the Leyte operation and assigned missions to the Allied Air Forces. He designated General Whitehead's 5th Air Force as the Air Assault Force. It was to support the operation by intensified air activities against enemy installations, destroy hostile air and surface forces in the Celebes Sea and assigned areas in the Philippine Archipelago, and provide air defense for existing bases and forces in transit to Leyte within range of its capabilities. It was also to be prepared to establish, on order, land-based air forces on Leyte. The 13th Air Force was to support the missions of the 5th Air Force, while the Royal Australian Air Force Command was to destroy Japanese installations and sources of raw materials in the Netherlands Indies.

Additionally, Halsey’s 3rd Fleet was to be on standby to support the Leyte operation, with the objective of "destroying enemy naval and air forces in or threatening the Philippine Area." Submarines from both the Southwest and Central Pacific Areas would provide support through offensive reconnaissance of likely Japanese routes, maintaining observation and lifeguard services, and offering weather reports and strategic patrols. On the ground, General Krueger’s 6th Army would lead the Leyte assault, taking over the operation after the disbandment of Alamo Force on September 25. With this force moving to the Philippines, General Eichelberger’s 8th Army was assigned garrison duties in New Guinea, New Britain, the Admiralties, and Morotai. For King II, Krueger’s forces included General Sibert’s 10th Corps, consisting of the 1st Cavalry and 24th Infantry Divisions, totaling 53,000 men, and General Hodge’s 24th Corps, comprising the 7th and 96th Divisions, totaling 51,500 men.

The corps originally designated for the canceled Yap operation was reassigned to the 6th Army, replacing the 14th Corps, which was meant to carry out the initial Leyte landings after securing Mindanao. However, the 14th Corps was still in the process of being relieved at Bougainville. To further support the operation, Krueger kept the 32nd and 77th Divisions in reserve, totaling approximately 28,500 troops. Krueger's plan involved an advance team landing Lieutenant-Colonel Henry Mucci's 6th Ranger Battalion on the islands guarding the approaches to Leyte Gulf on October 17. As the Rangers took control of these small islands, Admiral Oldendorf's Fire Support Group would initiate a comprehensive bombardment campaign in preparation for the landings. Minesweepers and underwater demolition teams would also begin clearing natural and man-made obstacles from the gulf. On October 20, Admiral Barbey's Task Force 78 was to transport and land the 10th Corps, while Admiral Wilkinson's Task Force 79 was tasked with landing the 24th Corps. The reinforced 21st Regiment was scheduled to land at 09:30 near Panaon Strait, at the southeastern tip of Leyte, to secure control of the entrance to Sogod Bay. Further north, the 10th Corps was to land two divisions abreast in the Marasbaras and Palo areas at 10:00, while the 24th Corps would simultaneously land two divisions abreast in the Dulag area, about 15 miles to the south. Major-General Verne Mudge’s 1st Cavalry Division was to capture Tacloban and its airfield and secure control of San Juanico Strait, while Major-General Frederick Irving’s 24th Division seized Palo and advanced northwest through the Leyte Valley. The two divisions would then converge on Carigara at the northern end of the valley.

Hodge's strategy involved Major-General James Bradley’s 96th Division landing between Dulag and San Roque to secure a segment of Highway 1 within its operational zone, as well as Catmon Hill and the Dagami-Tanauan area. Since Bradley’s task was relatively easier, the 381st Regiment was designated as Krueger’s floating reserve. At the same time, Major-General Archibald Arnold’s 7th Division was tasked with coming ashore in the Dulag area. One part of this division was to move south to capture the Highway 1 bridge and the Daguitan River crossings at Dao, while the main force advanced along the Dulag-Burauen road to take Burauen and then push on to Dagami. From there, Arnold's troops were expected to be ready to seize Abuyog and Baybay, eliminating enemy forces on the west coast and in southern Leyte. With the successful completion of these objectives, Krueger aimed to break the backbone of Japanese resistance. Consequently, with Leyte Valley and its airfields and base sites secured by the 6th Army, the 10th Corps would then advance south through the Ormoc Valley towards Ormoc, while the 24th Corps would move north from Baybay along the Ormoc Bay coast to link up with Sibert. Meanwhile, General Yamashita relied on General Suzuki’s 35th Army, which consisted of four divisions and two independent mixed brigades dispersed across the central and southern Philippines. Specifically, Leyte was defended by Lieutenant-General Makino Shiro’s 16th Division, experienced veterans of the initial Japanese invasion of the Philippines. Aside from minor forces left on Luzon and Samar, Makino commanded the full combat strength of the 16th Division, supplemented by 4th Air Division ground units, 35th Army service units in the area, and elements of the 36th Naval Guard Unit stationed at Ormoc and Tacloban.

Anticipating that enemy landings would most likely occur in the Dulag-Tarragona-Abuyog sector, Makino strategically positioned the majority of his troops in fortified coastal positions between Abuyog in the south and Palo in the north, with the densest concentration around Dulag. By October, the 16th Division had completed three lines of trenches along the shoreline, but these defenses were weak and inadequately placed. The field positions were old-type long connecting trenches prepared in three echelons. These were difficult to defend and easily discovered from the air since camouflage was lacking. The only effective positions were the cave emplacements for artillery, which had been constructed on Catmon Hill. About 60% of the defenses constructed were completed by the time of the invasion.

In the event of an enemy invasion, Suzuki kept the 30th Division and three battalions of the 102nd Division as a mobile reserve, ready to be deployed to destroy the enemy wherever they landed. This strategy was known as the Suzu Plan: if the enemy landed at Davao, the mobile reserve would reinforce the 100th Division; if they landed on Leyte, the main force of the 30th Division and three battalions of the 102nd Division were to land at Ormoc to support Makino's defenders.

Meanwhile, back in September, Mitscher's fast carriers had conducted several strikes against the Philippines, leading to the near destruction of Japanese air forces and shipping in the region. To prevent air reinforcements to the Philippines, Halsey ordered Admiral Sherman's carrier-based aircraft to launch strikes against enemy aircraft staging areas in the Ryukyus, particularly Okinawa, on October 10. These strikes successfully destroyed an estimated 111 planes and sank or damaged 34 ships. Simultaneously, a cruiser force under Rear Admiral Allan Smith shelled Minami Torishima. The following day, the carriers under Admirals McCain and Davison carried out a feint attack on northern Luzon, sinking two more ships off Aparri.

As the attack on the Ryukyus began, Admiral Toyoda was at Shinchiku in northern Formosa, returning to Tokyo after a command inspection in the Philippines intended to boost morale. Upon learning of the strikes, Toyoda believed that the American carriers in the northern Philippine Sea were vulnerable to his powerful land-based air forces. Over 1,800 aircraft were allocated for Sho in total, but they were widely dispersed across the four operation regions. About one third of them were not battle-ready due to casualties and a lack of parts or trained pilots. When the fighting began, Vice-Admiral Fukudome Shigeru (commander of the 2nd Air Fleet based in the Kyūshū-Okinawa-Formosa district) had approximately 700 planes ready in Formosa and Kyushu. 100 or so aircraft in the Seto Inland Sea was later added to his command. Over the next four days, an additional 690 or so planes flew in from bases in Japan and China.

Toyoda saw this as a prime opportunity to deal a crippling blow to the enemy fleet and disrupt the Allied invasion timeline. Consequently, he decided to risk all available naval air power in a determined effort to destroy Mitscher’s carrier forces, taking personal command of the battle operations in Formosa on October 10.

As anticipated, Halsey planned to launch strong carrier-based strikes against Formosa on October 12 and 13. Mitscher’s four task groups were assigned targets in southern, northern, and central Formosa, as well as the Takao area. Additionally, General LeMay’s first two B-29 strikes of October were scheduled to support the attack, targeting the Okayama aircraft repair and assembly facility in Takao with 170 sorties. Originally set for October 11 and 14, these strikes were postponed to October 14 and 16 due to unfavorable weather forecasts.

After a rapid overnight approach on October 11, Mitscher’s carriers reached their positions off Formosa the next morning. All four task groups completed launch of predawn fighter sweeps by around 06:00 hours. Because the Japanese were on alert, Grumman F6F Hellcat fighters from all four groups were intercepted by enemy aircraft and moderate to intense anti-aircraft fire was universally reported. Air-to-air engagements were fiercest over northern and central Formosa, where aircraft from Rear Admiral Gerald F. Bogan's TG 38.2 and Rear Admiral Frederick C. Sherman's TG 38.3 operated. Sherman's USS Lexington and USS Essex claimed almost 50 enemy aircraft shot down between them. Bogan's task group contained three Essex-class carriers – USS Intrepid, USS Bunker Hill and USS Hancock. Intrepid and Bunker Hill claimed over 50 Japanese aircraft destroyed, making the combined claims for the two groups around 100. Many of Japan's more experienced pilots were killed during the first wave of American air raid. American carrier air groups had suffered minimal personnel losses with nine U.S. aircraft shot down with three pilots subsequently recovered by nearby ships or submarines. These lopsided results were in part due to a lack of experience among Japanese pilots. IJAAS fighters stationed to the north of the Philippines were still in training. The bulk of enemy fighter aircraft reported by U.S. aviators were Japanese Army types, primarily the Nakajima Ki-44 (Allied reporting name "Tojo"), Kawasaki Ki-61 ("Tony") and Nakajima Ki-43 ("Oscar") models. Even though there were some experienced Japanese naval aviators operating at this time, IJNAS Mitsubishi A6M Zero fighter units reconstituted after the Battle of the Philippine Sea were still learning to work together and did not execute the kind of section or division flying that yielded tactical advantage.

By the third strike, the Hellcats had established air dominance over Formosa, with Admirals Bogan and Sherman each claiming over 50 Japanese aircraft destroyed at the cost of nine American planes shot down.

This enabled the Americans to carry out four strikes during the day preceded by a fighter sweep. The Hellcats quickly gained air control over Formosa against the 230 Japanese fighters on the island. By the third strike of the day, the Americans faced no air opposition. A total of 1400 sorties were carried out on this day, sinking or damaging 24 vessels off the Pescadores and Takao. 

This led Toyoda to order the activation of the air component of Operation Sho-Go at 10:30 on October 12. Although over 1,900 dispersed aircraft were assigned to Sho-Go, most did not arrive in the forward area for several days. Consequently, Vice-Admiral Fukudome Shigeru's 2nd Air Fleet began preparing up to 800 planes in southern Kyushu for an attack, supported by Admiral Ozawa's newly-reconstituted flying groups from the 3rd and 4th Carrier Divisions. Though the day's remaining carrier strikes by Hellcat fighters, Curtiss SB2C Helldiver dive bombers, and Grumman TBF Avenger torpedo bombers did significant damage to military installations on Formosa, they failed to completely neutralize Japanese air power based on the island. Lead aircraft on 14 October had made photos revealing Navy damage which included four buildings destroyed and nine damaged out of eighty at the assembly plant, and five hangars destroyed at the air base. Many surviving structures would be destroyed by B-29 raids during the later days of the battle, however. 

The only Japanese attack that day involved about 45 torpedo bombers, which mistakenly reported two carriers as damaged. Meanwhile, the T Attack Force, a special unit for operations in adverse weather, conducted a strike within a sudden typhoon from 19:00 to 20:20 before landing on Formosan bases. Their efforts were largely ineffective as American ships used smoke screens and evasive maneuvers to avoid damage. Eight Japanese aircraft were shot down by ships' guns during the night, and three Mitsubishi G4M "Betty" bombers were claimed by night fighters from the USS Independence. USS Pritchett suffered damage from friendly fire, but no damage from enemy aircraft was incurred. On October 13, Mitscher's forces resumed strikes against Formosa and the Pescadores with up to 600 aircraft, encountering less opposition but achieving only minor damage due to poor weather. Despite this, Halsey reported the destruction of 520 Japanese aircraft, the sinking of 37 ships, and 74 probable sinkings over the two days.

At dusk, the carriers came under attack from 32 planes of the T Attack Force. Despite Belleau Wood’s combat air patrol shooting down 16 enemy aircraft, six G4M bombers managed to evade the interceptors and launched a series of determined attacks on Davison’s carriers, releasing four torpedoes before all six were eventually downed by shipboard anti-aircraft guns. Fortunately, the torpedoes missed their targets. One torpedo ran just ahead of the USS Franklin, and another ran too deep and passed beneath the carrier. One of the Bettys attempted to crash into Franklin on its way down but glanced off the flight deck and slid over the starboard edge of the ship into the water.

However, McCain’s carriers faced more challenges as eight B6N2 bombers, evading radar by flying low, attacked the group. While six of the bombers were shot down by anti-aircraft fire, one successfully torpedoed the cruiser Canberra, killing 23 crew members and causing severe damage. The torpedo struck the cruiser in a vulnerable spot—under the main armor belt between both firerooms. The ship lost all power, laying just 90NM off Formosa. As a result, Halsey organized a unit to tow Canberra to safety, necessitating an additional day of protection for the damaged cruiser. On October 14, Mitscher launched early morning fighter sweeps to suppress enemy air power over Luzon and Formosa, while the newly-formed unit escorted Canberra. Japanese reports claimed two carriers were sunk and one was burning, leading Toyoda to believe the enemy retreating east had been severely damaged. Consequently, Fukudome ordered his full strength of 450 planes to launch from southern Kyushu, and Vice-Admiral Shima Kiyoshide’s 2nd Striking Force was deployed to sweep the waters east of Formosa. However, before the Japanese could counterattack, 130 B-29s from Chengdu attacked Formosa in the afternoon, with 104 bombers successfully dropping about 650 tons of bombs on Okayama and 13 hitting secondary targets. A dozen planes made emergency landings at friendly fields in China, one crashed near Changteh whence its crew walked out, and one was listed as missing. This was a cheap price to pay for very severe damage done to Okayama installation.

At 15:25, Fukudome’s initial wave of 124 planes attacked Bogan’s carriers. A formation of 25 Yokosuka D4Y "Judy" dive bombers, using cloud cover to evade detection, was intercepted by the group's combat air patrol. Only a few Japanese planes made it past the American fighters. The surviving bombers were able to put two bombs in the vicinity of the Hancock, and one hit the forward port side gun tube without detonating on impact. No serious damage was inflicted by this attack. At around 17:00 a large formation of enemies showed up on radar headed towards TG 38.3. As before, a great many of these were shot down by combat air patrol. The surviving enemy planes flew down to the water level to evade further radar detection. These planes – torpedo bombers and fighters – successfully ambushed the formation just minutes later. Evasive maneuvers, squall weather, and poor fighter cover on the part of the Japanese helped TG 38.3 escape without suffering any significant damage.

The only bright spot for the Japanese was another twilight attack by the T Force by 52 aircraft against TG 38.1. Four Jills broke through to attack light cruiser Houston. Three were shot down, but the last succeeded in placing a torpedo in another vulnerable spot that flooded the engineering spaces and caused all power to be lost. As a result, Halsey was left needing to tow two cruisers to safety.

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By hook or by crook, General MacArthur bullied FDR into allowing an invasion of the Philippines. To soften up the new targets, strikes were unleashed against Luzon, Formosa and Okinawa. Despite a strong Japanese defense, American air superiority was achieved through aggressive carrier strikes, leading to the destruction of numerous Japanese aircraft and ships.