- 135 - Pacific War - The Great Marianas Turkey Shoot, June 18-25, 1944

Last time we spoke about the Invasion of Saipan, Tinian and Guam. The Japanese mistakenly believed that the Americans were preparing for a decisive battle near New Guinea, not realizing the real target was Saipan. The US assembled a large fleet for Operation Forager, aiming to capture Saipan, Tinian, and Guam, advancing the US strategy to establish strategic airfields to hit  Tokyo. Japanese defenses were ill-prepared, with shortages of ammunition and inadequate inland defenses. The Americans hit Saipan with extensive air and naval bombardments, neutralizing Japanese positions, and faced stiff resistance during landings but ultimately secured a beachhead. The 23rd Marines of Colonel Louis Jones, advanced through Charan Kanoa and secured Mount Fina Susu despite significant losses. Heavy artillery pinned them down at the O-1 Line, leading Jones to reposition his forces. Casualties mounted on both sides as American forces fought to secure the beachhead and push inland.

This episode is the the Great Marianas Turkey Shoot

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. 

Before his death Admiral Yamamoto instilled a sort of mind virus into the Imperial Japanese Navy. To be honest, the virus was a pre war doctrine, laying around ever since perhaps the First-Sino Japanese War of 1894-1895, but Yamamoto certainly focused attention more so upon it. The infamous decisive naval battle. The event that could turn the tide of the war, to bolster Japan’s poker hand for peace negotiations. If Japan could simply knock out a enormous sum if not the entire strength the American Pacific fleet, something extremely unrealistic by this point of the war, but if they could, would America not reconsider settling this all up at the peace table? It had been the strategy of not just the IJN but for the Japanese military as a whole. Japan would never be able to win a war of attrition with the US, but they could make them pay so dearly, perhaps the Americans would just sue for peace. This idea consumed Yamamoto, leading to the disaster at the Battle of Midway. After the Guadalcanal Campaign, Japan lost the initiative, they retreated behind an inner perimeter. Henceforth the IJN scoured over the actions of the American navy, looking for any opportunity to unleash their full might down upon a significant American naval force. So many times the American navy eluded them, but here, with the invasion of Saipan, the IJN felt the decisive naval battle had finally come. 

Admiral Turner and General Smith's American forces had just successfully invaded Saipan, establishing a beachhead with some challenges by June 17. This incited a strong Japanese response, as Admiral Toyoda initiated Operation A-Go, the IJN’s strategy for a decisive battle that could potentially win them the war. Following Admiral Koga’s Plan Z, Toyoda's A-Go involved Admiral Kakuta's land-based aircraft providing early warning and reconnaissance, aiming to neutralize one third of the enemy carriers before Admiral Ozawa’s carriers completed the destruction of the enemy fleet with large-scale daytime air attacks, operating beyond the enemy's aircraft range. Additionally, Toyoda planned a nighttime surface engagement where enemy screening forces would be targeted by massed torpedo attacks. On June 16, at 9:00, the First Mobile Fleet departed the Guimaras and headed to the northeast. At 5:30pm, the Japanese fleet entered the Philippine Sea through the San Bernardino Strait. Admiral Ugaki’s battleships Yamato and Musashi were not with the main body, but were proceeding independently through the Philippine Sea with two heavy cruisers, a light cruiser and five destroyers to join with Ozawa. Once into the Philippine Sea, Ozawa headed southeasterly. At about 5:00 on the 16th, Yamato and Musashi joined with the First Mobile Fleet. The Japanese began to refuel which was not completed until 10:00 on the 17th. 

In response, Admiral Spruance directed Admiral Mitscher’s Task Force 58, strengthened by Admiral Lee’s battleships and Turner’s cruisers and destroyers, to remain positioned west of the Marianas, prepared to counter any IJN attack. On June 16, Mitscher continued strikes against Guam and Tinian. Several Japanese aircraft were destroyed on the ground and in the air, but their airfields remained usable. The following day saw an increase in Japanese air activity. A small strike flown from Truk, five torpedo bombers and one J1N1-S night fighter attacked a transport group east of Saipan at 5:50pm. Three Japanese aircraft were claimed as destroyed, but a torpedo hit the small landing craft LCI-468 that later sank. On June 18th, the Japanese mounted a larger raid, this time from Yap Island. This operation featured 31 Zeros, 17 Judys and two P1Y twin-engined bombers. Combat Air Patrol did not intercept this group before it attacked shipping off the landing beach at Saipan that resulted in damage to an LST. The attack group then encountered the American escort carrier groups and attacked them at dusk. Two escort carriers were nearmissed and Fanshaw Bay was hit by a bomb which penetrated to the hangar deck. The carrier was forced to retire for repairs. As usual, Japanese aviators over-claimed, stating that three or four carriers from Task Force 58 had been hit.Furthermore, Admirals Lockwood and Christie's submarines were tasked with reconnaissance of IJN fleet movements, launching attacks when possible, and rescuing downed aircrews. Since Ozawa’s fleet maintained radio silence and operated beyond the reach of American search planes, the only way to track his movements was through submarines, leaving the Americans mostly uninformed until the battle began.

Unknown to Ozawa and Toyoda, Mitscher's carrier aircraft had already disabled Kakuta's land-based air power in the area, which significantly weakened a major part of A-Go. Additionally, the Americans, who had acquired Plan Z on April 3, were prepared for the critical carrier battle, although they were hesitant to engage in nighttime combat. Meanwhile, on June 18, the 2nd and 4th Marine Divisions began their attacks at 10:00 a.m. The 4th Marine Division attacked toward the east coast with three regiments abreast: 25th Marines on the right, 24th Marines in the center, and 23rd Marines on the left. The 3rd Battalion, 24th Marines, remained attached to the 23rd Regiment. Good progress was made by the 24th and 25th Marines, although the former sustained an attack at 10:15 by two Japanese tanks which surged to within 350 yards of the front lines. The situation for a while was alarming: American tanks had departed for rear areas to refuel and rearm so that only bazookas were immediately available for anti-tank defense. Though the 24th Marines’ Weapons Company was immediately alerted, it arrived too late to participate in the fight. The enemy tanks were finally chased by bazookas and artillery, but not before they had sprayed the area, causing 15 casualties with machine-gun and small cannon fire. A portion of the O-3 line was reached by the 24th and 25th Marines during the day, placing the latter along the coast of Magicienne Bay. This healthy gain severed the island's southern portion, including Nafutan Point, from the remainder of the island. To maintain the momentum of the attack and avoid the long delay of a mopping-up process, the 24th Marines by-passed the southern extremity of a heavily defended cliff line running north and south through its zone of action. However, since the direction of attack for the division would soon Swing north through the by-passed area, it was necessary to secure the cliff line. This mission was assigned to the division reserve, 1st Battalion, 25th Marines. This, the unit’s first experience with cleaning cave positions, proved a sIow, unpleasant and dangerous task. Rather than a coordinated move, the task took the form of a series of small, separated actions, each employing groups of four or five men.

At 7:30, the 3rd Battalion, 24th Marines, relieved Haas’ 1st Battalion on the division’s left wing and commenced the move on O-2, which would serve as the line of departure. As will be seen, however, events of the day prevented the regiment from reaching this line. Organizational readjustments within the 23rd Marines included the attachment of the 3rd Battalion’s rifle companies and 81mm mortar platoon to Dillon’s 2nd Battalion and formation of a composite battalion from the 1st Battalion and the 3rd Battalion Headquarters. The latter unit would support the attack of the other two battalions from positions on Mt. Fina Susu. Machine-gun fire stopped the 23rd Marines’ left elements after an advance of 200 to 250 yards. Most of this fire came from a clump of trees to their front, but a definite location of enemy weapons was impossible. Frequent barrages of Japanese mortar fire hampered efforts to spot the enemy, and the attack faltered. At this juncture, Cosgrove’s composite battalion was committed on the left of the 3rd Battalion. 24th Marines, in an attempt to retain the impetus, and the attack again moved forward. But the advance was slow. By 5:15, the 23rd Marines had moved to a line about 400 yards short of O-2. Prior to darkness, 23rd Marines’ patrols were dispatched to the east. On the right, these patrols reached O-2, but on the left machinegun fire denied movement as far as O-2. Colonel Jones, the 23rd Marines’ commander, requested permission from General Schmidt to withdraw to more favorable ground for the night. General Schmidt approved, and the 23rd pulled back to a position about 400 yards east of Lake Susupe, breaking contact with the 2nd Division.

The 23rd Marines emerged from the swamps, the 24th Marines reached the base of Hill 500, and the 25th Marines progressed to Magicienne Bay, effectively dividing the island. General Smith's soldiers also captured the Aslito Airfield, with the 165th and 105th Regiments securing Cape Obiam and the area south of the field. This isolated numerous Japanese forces in the north at Nafutan Point. Concurrently, General Saito was shifting his remaining troops to the Garapan-Mount Tapotchau area, facing relentless artillery, naval, and air attacks that left the Japanese in a dire situation. 

The chief of staff of the 31st Army, General Igeta, drafted a message on the morning of June 18th to the commanding general at Yap Island and the chief of staff in Tokyo. In it he summarized the situation as he saw it and, in the process, revealed how very little he knew of what was taking place. Not that the general was caught in the bog of apathy, nor was he too frightened or lazy to find out what was going on; it was simply impossible for him to penetrate the shroud of obscurity resulting from ruptured communications in the vast area over which the action was taking place. As such, he erroneously reported that the 43rd Division HQ “underwent an enemy attack this morning and the division CO died along with his staff officers.” In another dispatch later in the day, Igeta corrected his error in regard to the division commander’s death, reporting that General Saito was “all right, but that his staff officers were wounded.” He also added that “the secret documents in custody of the 31st Army Headquarters… were completely burned at 1830 of 18 June…” Recognizing the desperate circumstances, Prime Minister Tojo sent a fatalistic message to the garrison, despite reinforcements en route. “Have received your honorable Imperial words. By becoming the bulwark of the Pacific with 10000 deaths; we hope to acquire Imperial favor.”

Reports indicated that Ozawa's mobile fleet was approaching the Marianas and expected to arrive on June 19. When Spruance finally received the spotting report from Cavalla, this prompted a decision that turned out to be the most important of the battle. Assuming that the report from Cavalla was Ozawa’s main force, and assuming it would continue at a speed of 19 knots to the east, Spruance’s staff calculated that the Japanese would still be about 500nm from TF 58 at 5:30 on the 18th. This placed the Japanese well out of range of American searches or strikes. The only way to alter this situation was to steam TF 58 to the southwest toward the contact and plan to locate and engage the Japanese during the afternoon of the 18th. Mitscher advised the aggressive option of steaming to the southwest to close the range on Ozawa’s force. He wanted to launch afternoon strikes to locate and possibly attack Ozawa and even advocated a nighttime surface engagement. While this offered the possibility of opening the battle on terms set by the Americans, there were several problems with it in Spruance’s calculating mind. The first was that TF 58 was not yet concentrated; TGs 58.1 and 58.4 were not due to link up with the other two task groups operating west of Saipan until 1200 on the 18th. If he allowed Mitscher to take off to the west, it would only be with two task groups. Since the Japanese possessed longer-range strike aircraft, this offered Ozawa the chance to attack TF 58 and defeat it piecemeal. As for the prospects of a night engagement, both Spruance and Lee declined that possibility.

 In response, Spruance adopted a cautious approach, instructing Mitscher to gather his carrier groups and redirect them toward Saipan. In a last effort to change Spruance’s mind, Mitscher sent him a message at about 11:30pm and proposed a course change to the west at 1:30am in order to position TF 58 to launch a strike against the Japanese carrier force at 5:00am. At 12:38am on the 19th, Spruance sent a message rejecting the proposal. The die was finally cast for a defensive battle on June 19.Spruance's priority was to safeguard the invasion force rather than eliminate the Japanese fleet.

At 6:00am on the 18th, Japanese search floatplanes from the First Mobile Fleet spotted six carriers from TF 58. In the afternoon, seven aircraft from Carrier Division 1 flying out to 420nm spotted TF 58 after its 1200 rendezvous. The first report was issued at 3:14pm and included detection of an American task group with two carriers. A second aircraft sighted a task group with an “unknown number of carriers” at 4:00 and later issued another report at 1710 which identified two task groups, each with two carriers. These were within strike range, but Ozawa elected not to launch an immediate strike since his pilots were so inexperienced in night flying. Nonetheless, Rear-Admiral Obayashi Sueo of the 3rd Carrier Division boldly ordered the launch of 67 aircraft from the carriers Zuiho, Chitose, and Chiyoda, hoping to surprise the Americans. However, when he learned of Ozawa’s decision, Obayashi reluctantly called off his strike. Ozawa had correctly assessed that the enemy would hold its position near Saipan, allowing him to maintain his own position without fearing an American attack. With this understanding, he changed course southwest to maintain the distance, while Admiral Kurita’s Vanguard Force moved east, and Forces A and B shifted south. At 03:00 on June 19, all three forces turned northeast and increased their speed to 20 knots. Ozawa executed his plan flawlessly, positioning himself to launch significant attacks against the unsuspecting Americans the next morning. His only misstep was breaking radio silence at 20:20 to coordinate the decisive operation with Kakuta, who consistently misrepresented the true condition of his air forces while giving overly optimistic reports of successes by his aviators. As a result, an American station intercepted the transmission and geo-located it accurately. Once the mobile fleet reached strike positions, the Japanese began launching search aircraft, sending 16 floatplanes at 04:45 and another 14 planes about 30 minutes later. Although they lost seven scouts, the Japanese were able to spot the northern elements of Task Force 58 and the picket destroyers deployed ahead by 7:00.

Starting at 05:30, Mitscher's combat air patrol engaged Japanese aircraft from Guam, which were unsuccessful in bombing destroyers. At 6:30am, American radar detected Japanese air activity over Guam and four Hellcats were sent to investigate. At 7:20am, these arrived and found themselves in the middle of many Japanese aircraft taking off. More Hellcats rushed in and, beginning at 8:07am for the next hour, there was constant combat over and near Guam. Up to 33 American fighters were involved, and they claimed 30 fighters and five bombers. The Americans claimed to have destroyed 30 aircraft, successfully hindering Kakuta's support for Ozawa's decisive battle. However, with the return of Japanese floatplanes, Ozawa was preparing to launch his first strike, deploying 69 aircraft: 16 Zero fighters, 45 Zeros with bombs and eight Jills with torpedoes at 08:30 under Obayashi's command. Fortunately for the Americans, radar warnings enabled Mitscher to dispatch every available Hellcat for interception. At 10:23am, launching of every available Hellcat from TF 58 began as the force headed east into the wind. The American carriers cleared their decks and all airborne bombers on search and patrol missions were instructed to clear the area. This allowed the fighters to return as necessary to rearm and refuel. The goal was to keep as many fighters in the air as possible to intercept incoming threats. The Hellcats had reached their interception altitudes of between 17,000 and 23,000ft when at 10:35am they spotted the incoming Japanese aircraft identified as two groups of strike aircraft with escorting Zeros on each flank. The first American fighters on the scene were Hellcats from Essex. Lieutenant Commander C. Brewer of Fighter Squadron 15 VF-15 led them.  The escorting Japanese fighters did not protect the bombers and the bombers scattered making them easy to pick off. Brewer claimed four aircraft, and his wingman claimed another four. In all, VF-15 pilots claimed 20 Japanese aircraft. Joining the Hellcats from Essex were others from Hornet and Bunker Hill as well as from five light carriers for a total of 50 Hellcats. Altogether, some 25 out of the 69 Japanese aircraft in this raid were accounted for by this initial interception. In return, three Hellcats were lost in combat and a Bunker Hill Hellcat was lost when it ditched on its way back to its carrier. The remaining Japanese aircraft continued their approach but were intercepted by Bunker Hill's Hellcats, which claimed another 16. Only around 28 Japanese planes remained and made minor attacks on Admiral Lee's group. Two targeted battleship South Dakota, with one scoring a direct bomb hit at 10:49, though causing minimal damage. Another narrowly missed heavy cruiser Minneapolis, while another almost missed cruiser Wichita. The Japanese reported  losing 42 aircraft:  eight fighters, 32 fighter-bombers, and two torpedo bombers. Most had been destroyed by Hellcats, with anti-aircraft gunnery from TG 58.7 accounting for the rest. Meanwhile, Ozawa launched his main strike at 08:56, composed of the 1st Division's best-trained pilots from three fleet carriers. This was a large strike designated Raid II from the three fleet carriers of Carrier Division 1 with the best-trained aviators in the First Mobile Fleet. The raid consisted of 128 aircraft – 48 Zero fighters, 53 Judy dive-bombers and 27 Jills with torpedoes. Launching began at 08:56 but was disrupted when at 09:09 Taiho came under attack by American submarine Albacore. The submarine fired six torpedoes at the fast-moving carrier. A last-second glitch in the boat’s fire-control computer made it necessary to fire the six torpedoes by eye. One of Taiho’s aircraft saw the torpedoes headed for the ship and dove into one in an effort to save the ship. In spite of this, one of the torpedoes hit the carrier abreast the forward elevator and created a hole which resulted in flooding. The ship’s forward elevator, which was raised for the launch, was knocked out of alignment and fell several feet. Within 30 minutes, the elevator space was planked over by damage-control personnel and the launch continued. In addition to the aircraft lost from Taiho, eight other aircraft developed engine trouble and were forced to return. More trouble soon followed. When the attack group flew over the Vanguard Force deployed about 100nm in front of the main carrier force, it was engaged by the Japanese ships. This fire was effective enough to shoot down two more aircraft and damage another eight that were forced to return. 

This attack and some friendly fire reduced the Japanese force to just 109 aircraft for the largest strike of the day, which was detected by radar. In a swirling action that began at 11:39am, the Hellcats again tore through the Japanese formation. McCampbell claimed three Judys and his wingman two. Other Hellcats joined the fray resulting in about 70 Japanese aircraft being shot down. VF-16 from Lexington claimed 22 Japanese aircraft without a loss; 12 Bunker Hill Hellcats were unable to gain a solid intercept but still claimed five kills, and Hellcats from light carriers Bataan, Monterey and Cabot claimed ten, seven and five, respectively. VF-1 from Yorktown also scored heavily. This still left a number of Japanese aircraft headed for TF 58. Twenty were reported in three groups at 11:45. Most of these made the mistake of attacking the picket destroyers deployed in advance of TG 58.7 or Lee’s battleship force itself. Destroyer Stockham reported being under attack for 20 minutes, but again the ship suffered no damage. Around noon, TG 58.7 came under attack. Two torpedo bombers attacked South Dakota with no success, and two more selected Indiana in the center of TG 58.7’s formation as their target. One crashed into the waterline of the heavily armored ship but caused little damage. Another Jill went after Iowa, but again missed. Alabama was undamaged by two bombs aimed at her. Potentially more serious was a group of six Judy dive-bombers that escaped the Hellcats and proceeded south until running across TG 58.2. Of this group, four selected carrier Wasp for attack. None scored a hit, but one of the bombs detonated overhead which rained down shrapnel that killed one and wounded 12 crewmen. The other two selected TG 58.2’s other fleet carrier, Bunker Hill, for attack at 12:03. They scored two near misses that caused minor fires and other damage, in addition to killing three and wounding 73. Both carriers continued in action. Four of the aircraft were shot down by antiaircraft fire, with the other two landing on Rota and Guam. Finally, six B6N bombers attacked Admiral Reeves’ carriers, but their attacks began at 11:57 and were also ineffective, failing to hit any targets. One missed Enterprise, and another three attacked light carrier Princeton, but all three were destroyed by antiaircraft fire.Thus, Ozawa’s second strike resulted in a significant loss for the Japanese, with 97 of the 128 aircraft not returning to their carriers. His losses totaled 32 fighters, 42 dive-bombers and 23 Jills.

At 5:30, the third group of Japanese scout aircraft took off. This comprised 11 Judys from Shokaku and two Jakes from heavy cruiser Mogami. The aircraft flew 560nm to the east. Two contacts were radioed back to Ozawa. The first, at 9:45, was reported at a position well to the south of TF 58’s actual position. The problem resulted from an uncorrected compass deviation on the search aircraft. This contact was designated “15 Ri” by the Japanese. The second contact, designated “3 Ri”, was reported at 10:00. It was of a task force of three carriers and escorts to the north of TF 58’s actual position, but may have been of TG 58.4.This third Japanese strike designated Raid III by the Americans was mounted by Carrier Division 2. This effort, from Junyo, Hiyo and Ryuho, comprised 47 aircraft including 15 fighters, 25 Zeros with bombs, and seven Jills with torpedoes.

The remaining 20 aircraft saw what they believed to be two battleships but chose to keep searching for carriers. After a failed search, the group eventually attacked the battleships they initially spotted at 12:55 but were intercepted by Hellcats and lost seven aircraft. Nonetheless, the group pressed on and attacked Rear-Admiral William Harrill’s carriers at 13:20. The effort was ineffective with one aircraft dropping a bomb 600 yards from Essex. Ozawa’s third strike had accomplished nothing, but at least 40 of its 47 aircraft survived to return to their carriers.

At 11:00, Ozawa launched his final attack of the day, consisting of 82 aircraft from the carriers Junyo, Hiyo, Ryuho, and Zuikaku of Carrier Division 1. It comprised 30 Zero fighters, ten Zeros with bombs, 27 Vals and nine Judys and six Jills. The planes set off for the new, incorrect southern target and found nothing, causing them to divide into three groups. The largest group of 49 planes headed toward Guam, where the Americans had been periodically discarding their ordnance to neutralize Kakuta’s airfields. 

As Ozawa sent his series of strikes against TF 58, Spruance directed Mitscher to keep a number of Hellcats active over Guam to disrupt any Japanese attempt to mount attacks from there. This reflected Spruance’s fear that the Japanese would use Guam as a base for “shuttle bombing” using aircraft from the 1st Mobile Fleet. Before the first Japanese carrier raid, Hellcats encountered airborne Japanese aircraft over Guam. This action continued throughout the day and periodically intensified when TF 58 dive-bombers and Avengers, ordered to the east to steer clear of the air battle, dumped their ordnance on Guam. Before noon, 15 Yorktown and 17 Hornet Helldivers bombed Orote Field on Guam. Another attack was mounted at 13:30 by Dauntlesses from Lexington and Enterprise, nine Avengers from Enterprise and ten Hellcats for escort. The armor-piercing bombs carried by the dive-bombers did little damage, but the Avengers succeeded in cratering the runway. Other attacks continued throughout the afternoon including Hellcats from Bunker Hill strafing Japanese aircraft on the ground and 11 Helldivers from Essex just before 14:00. The price to keep Guam suppressed during the day was steep – six Hellcats and one Helldiver – but the Base Air Force did not support Ozawa’s main attack.

Back over at the carrier action, Ozawa’s first group approaching Guam were picked up by TF 58 radar at 1449hrs. Before long, 27 Hellcats were on the scene. Among these were 12 from light carrier Cowpens, seven from Essex again led by McCampbell, and eight from Hornet. The Hellcats did great execution, shooting down 30 of the 49 Japanese trying to land on Guam. The remaining 19 planes landed but were damaged on the ground and could no longer fly.Another 15 aircraft headed for Rota but changed course to attack Montgomery’s group when they sighted it en route. Six aircraft approached Wasp unmolested until 2:23 when they were engaged by antiaircraft fire just as they were dropping their bombs. Adept maneuvering by Wasp thwarted the aircraft, identified as Judys. Another group of divebombers appeared and split up; two went after Bunker Hill, and one after Wasp. All missed, and of the nine attackers, only one escaped. The final 18 aircraft of Raid IV, including the eight from Zuikaku and ten Zeros with bombs, were returning to their carriers when they encountered two American scout groups consisting of Hellcats and Avengers some 200nm west of Guam.This encounter cost the Japanese six aircraft, but they did gain a measure of revenge when at 3:30 the same group of returning Japanese aircraft encountered and shot down two Bunker Hill aircraft on a search mission. Despite these efforts, none of the American ships were hit during this fourth attack, while Ozawa suffered a significant loss of 73 aircraft.

The situation worsened when the submarine Cavalla spotted Shokaku recovering aircraft at 11:52 and launched six torpedoes. Three torpedoes hit the carrier's starboard side at 12:22, sparking fires in the hangar and causing the ship to list. Soon, the ship came to a halt and was left behind when Carrier Division 1 moved north. At 1310, the fires on the hangar set off a bomb that set off fumes from the cracked forward fuel tank. Large explosions ensued and it was obvious the carrier was doomed. Shokaku sank at 15:01, resulting in the deaths of 1,272 crew members. The light cruiser Yahagi and destroyers Urakaze, Wakatsuki, and Hatsuzuki rescued Captain Matsubara and 570 men. Additionally, a torpedo hit Taiho, cracking the forward aviation fuel tank and turning the IJN’s newest and most heavily protected carrier into a floating bomb.

At 3:32pm, a massive explosion hit Taiho, lifting her flight deck and causing damage to her hull that led to the ship sinking. Despite Ozawa's initial desire to stay with the carrier, he and his team were eventually evacuated by a destroyer. However, 660 members of Taiho's crew perished as the ship sank. The transfer to the Haguro, added to the confusion for Ozawa was the fact that he and his staff were jammed into inadequate facilities aboard heavy cruiser Haguro after they were forced to depart from Taiho. Communications were grossly inadequate; Ozawa admitted later that he should have turned over command to Kurita until he could have moved to a ship with adequate command and control facilities. After the final strike aircraft returned, the Japanese turned northwest at 18:08, preparing to refuel the following day before continuing their attack. In their four strikes, the Japanese had launched 373 aircraft; of these 243 were lost. Added to these losses were another 50 from Guam, nine when Shokaku went down, and another 13 from Taiho to bring the total to 315. Some 296 Hellcats had been engaged during the day in combat, and only 14 were lost in combat with another six recorded as operational losses. The lack of sufficient training and experience among Japanese aircrews was evident, as seasoned American pilots compared the battle to “an old-time turkey shoot down home.” As a result of the significant losses inflicted on Japanese aircraft by American forces, the aerial portion of the Battle of the Philippine Sea was known as the Great Marianas Turkey Shoot. In the war upon the land, after an uneventful night, the 2nd Marine Division conducted patrols as Generals Schmidt and Smith focused on securing the rest of southern Saipan.

Although the 4th Marine Division's assault was postponed due to their need to disperse a sizable Japanese group near Tsutsuran village, the 27th Division pressed forward in the morning with the 165th Regiment swiftly reaching Magicienne Bay. In contrast, the 105th advanced more slowly through challenging terrain, resulting in a gap between the two regiments and requiring the 165th to extend its lines to maintain contact. Further north, Colonel Jones' 23rd Marines succeeded in advancing close to Hill 500 after intense artillery bombardment, but were compelled to withdraw about 400 yards to protect their vulnerable flank. At this stage, Brigadier-General Arthur Harper's Corps artillery had arrived on the island, offering essential reinforcement to the division's artillery units. By the end of the day, Schmidt's division realigned its regiments and shifted north. The most vicious action of the night occurred in the sector occupied by the 2nd Battalion, 24th Marines. Starting at about 3:50am and lasting until daylight, an enemy force of approximately 75 attacked the Marines with grenades and bayonets. In the close-in fighting that ensued, 11 Marines were wounded, but, in the process, the enemy attack was broken. By daylight, many of the attackers were sprawled forward of the Marines’ foxholes, the rest had taken to their heels. Meanwhile, Admiral Mitscher, having retrieved all his aircraft, set a westerly course and increased speed to 23 knots in an attempt to catch up with the enemy. However, on June 20, his usual morning search found no results. The Japanese also maintained radio silence during the day, with no new intelligence obtained by American submarines or PBM flying boats based in Saipan. In the afternoon, a successful search finally established contact, prompting Mitscher to prepare for a bold night strike against an enemy fleet beyond the maximum strike range.

Meanwhile, the plan to refuel the 1st Mobile Fleet on June 20 fell through amid confusion, prompting Ozawa to abandon the attempt after noon. He transferred to the Zuikaku and restored communications, discovering the extent of his aircraft losses. Ozawa’s hope that he could continue strikes was buoyed by reports from Kakuta that some of Ozawa’s aircraft had landed on Guam and the prospects that additional land-based aircraft reinforcements would flow into the area. The only concession he made was to move his next attack until the 21st.

However, at 16:45, Ozawa's reconnaissance revealed he had been spotted, so he decided to retreat northwest at 24 knots. Thirty minutes later, when his scout aircraft located Task Force 58, Ozawa opted to initiate a night attack with seven B5Ns and three radar-equipped B6Ns. Meanwhile, Mitscher launched a full deckload from 11 carriers, including 85 Hellcats, 77 dive-bombers, and 54 Avengers. The First Mobile Fleet was not well positioned to meet the attack. The Van Force with most of the heavy escorts and the best antiaircraft capabilities was not the closest formation to the incoming American strike. Each of Ozawa’s three groups was headed northwesterly with the Van Force to the south, Carrier Division 2 in the center and Zuikaku to the north. Astern of the carrier groups were the two supply groups composed of six oilers with their escorts, making this the closest group to the Americans. After an uneventful flight, the American aircraft found the 1st Mobile Fleet at 18:40, at the edge of their fuel range after nearly 300 miles. Lacking time for a coordinated attack, the American aircraft easily bypassed the 40 fighters and 28 bombers sent to intercept them and individually targeted the enemy carriers. The veteran carrier Zuikaku was defended by 17 fighters and put up a good fight with heavy antiaircraft fire and adept maneuvering. She avoided the four torpedoes aimed at her from the Hornet Avengers and took only a single direct hit by a 500- pound bomb aft of the island. After departing, the Americans reported the big carrier with heavy fires onboard. However, the damage was not as great as it appeared. The single bomb hit penetrated to the upper hanger deck where a fire started among the remaining aircraft. These were not fueled, so after a few tense moments and an order to abandon ship that was quickly rescinded, the fire was extinguished. Six near misses were recorded, but overall damage was light. Zuikaku, the last surviving carrier from the Pearl Harbor attack force, lived to fight again.

Aircraft from Bunker Hill, Monterey, and Cabot attacked the Chiyoda group, which evaded five torpedoes and sustained one bomb hit, surviving to fight another day. The Japanese were organized into three groups, each centered on a light carrier with several escorting battleships or heavy cruisers. The Zuiho and Chitose groups were not attacked, but the Chiyoda group was. The light carrier was the target of over 20 Helldivers and Avengers with bombs, but only a single bomb hit Chiyoda on the flight deck resulting in 20 dead, 30 wounded and two aircraft destroyed. The Avengers from Monterey probably scored the single hit, which caused a fire that was quickly extinguished. Chiyoda successfully dodged five torpedoes from Bunker Hill Avengers and lived to fight another day. Escorting battleship Haruna was hit by a 500-pound bomb that penetrated her stern and flooded the steering compartment. The ship’s speed was reduced, and 15 crewmen were killed and 19 wounded. Cruiser Maya endured a near miss that caused flooding.

The strike group from Lexington, with support from the Avengers from Enterprise, Yorktown, and Belleau Wood, and the bomb-carrying Hellcats from Hornet and Yorktown, attacked Admiral Jojima’s carriers. They inflicted minor damage on Junyo and Ryuho. Most of Lexington’s Dauntless dive-bombers selected Junyo for attention. At 7:04, one or two bombs hit the carrier’s island, and several near misses created minor flooding. Casualties included 53 dead, but overall damage was light. Light carrier Ryuho was attacked by the five Avengers from Enterprise with bombs at 7;10; eight hits were claimed, but only slight damage was caused by near misses. The carrier also survived attacks from Enterprise Dauntlesses, Avengers from Yorktown five with torpedoes and probably Hellcats from Hornet.

Hiyo suffered the most successful attack of the evening. The carrier left the formation to launch two Jills to lay a smoke screen and was caught behind the main body when the American strike arrived. In the opening attack by Dauntlesses from Lexington, one bomb hit the foremast and exploded above the bridge resulting in heavy casualties to bridge personnel. The Japanese reported that another bomb hit the flight deck. However, the group of four Belleau Wood Avengers with torpedoes caused fatal damage. Three conducted an anvil attack, and one torpedo hit the carrier’s starboard engine room. This was followed by a dive-bomb attack from six Enterprise Dauntlesses. The single torpedo hit, the only one scored by Avengers during the entire attack, proved fatal to the largely unprotected carrier. Within minutes, the damage created a list. The ship proceeded for a time on its port engine, but then went dead in the water. Just before sunset, at 1917, there was a large explosion amidships that caused a loss of power. The Japanese were convinced that this was the result of a submarine-launched torpedo, but there were no submarines in the area. A fuel-fed conflagration ensued, causing multiple explosions. The fire was beyond being contained, and the order to abandon ship was given.

Hiyo sank at 20:32, claiming 247 crew members. The final American counterattack came from Wasp’s aircraft, targeting Ozawa’s Supply Group to disrupt the withdrawal of the 1st Mobile Fleet by damaging the oilers. Three oilers were damaged, and two were later scuttled. In this series of uncoordinated attacks, the Americans lost 20 aircraft and destroyed 80 Japanese planes; although the results were underwhelming, with only one carrier sunk, they fared better than Ozawa’s combined strikes the previous day. At 20:45, American aircraft began returning to their carriers. The distance from the targets to TF 58 was between 240 and 300 miles, so fuel exhaustion was a real danger for many pilots. On a dark night, the returning aircraft began to return to their carriers at 8:45. Mitscher decided to ignore the potential Japanese air and submarine threats and ordered his ships to use extra illumination beyond the normal landing lights on each carrier deck to guide his appreciative aviators home. Any pretense of order was quickly lost and soon aircraft were ordered to land on any deck in sight. Almost half of the returning aircraft landed on the wrong carrier. This hectic scene took over two hours to play out. When the final accounting was complete, aircraft losses were expectedly heavy. The Americans would end up losing a total of 100 pilots and 109 crew members. Meanwhile, Admiral Toyoda ordered Ozawa to disengage from the decisive battle and retreat northwest, with the Japanese fleet successfully evading Mitscher’s slow pursuit and reaching Okinawa on the afternoon of June 22.

Once more, the Japanese sought a decisive battle but were decisively defeated. By the end, they had lost three carriers sunk, two carriers damaged, 395 carrier aircraft, about 200 land-based aircraft, two oilers, and four other damaged ships, with around 3,000 Japanese fatalities. In contrast, the Americans lost 130 aircraft and 76 aviators, with none of their damaged ships rendered out of service. The Battle of the Philippine Sea, the last carrier-versus-carrier battle of the war, stood out because the most conservative and defensive-minded side emerged victorious. In terms of scale the Great Marianas Turkey Shoot dwarfed the four carrier battles that preceded it. At the Battle of the Coral Sea, the Battle of Midway, the Battle of the Eastern Solomons, and the Battle of Santa Cruz Islands, the largest carrier engagement involved 7 carriers at Midway; by comparison there were 24 carriers at the Great Marianas Turkey Shoot. It was, by a factor of almost 350 percent, the biggest carrier battle in history. Though Mitscher’s Combat Air Patrol was not flawless, the combination of inadequate Japanese aircrew training and American radar-directed fighter interception rendered a significant Japanese strike ineffective. Ozawa conducted an intelligent battle, accurately assessing American intentions to launch carrier air strikes that would have been catastrophic to a carrier task force by 1942 standards. Nevertheless, his tools failed him. Despite Ozawa's skilled fleet handling, he lacked the airpower to inflict serious damage on Task Force 58. Admiral Spruance has faced criticism for his cautious approach, which exposed his carriers to attack without a strong chance of striking back at the enemy. Only the significant difference in skill between American and Japanese aviators and some good luck prevented this strategy from failing. 

Now back over on Saipin, General Watson continued to focus mainly on patrolling, while the 8th Marines worked to secure Hill 500. Colonel Wallace’s 2nd Battalion encountered minimal resistance, enabling them to quickly advance to the O-4 Line. Around 09:00, the 25th Marines moved towards Hill 500, subjecting the Japanese to a severe, thundering beating administered by the 4.5-inch rockets. As the Marines charged up the hill through the thinning smoke, artillery shells walked ahead in sturdy escort. Shortly before noon the hill was seized, and mopping up of the cave network began. Compartments at different levels and angles made it possible for the Japanese occupants to retreat from one cave-room to another, and the cleaning out process was a slow one. The price for Hill 500 was not light. Chambers’ battalion suffered 49 casualties, nine of whom were killed. Counted Japanese dead numbered 44. Upon examination, it was found that Hill 500 had been well organized for defense but that the positions were not strongly manned. As darkness approached, the Marines dug in to defend their newly won possession.

Meanwhile, the 24th Marines also reached the O-4 Line near Tsutsuran, but the 27th Division struggled to push the Japanese forces onto the challenging terrain at Nafutan Point. Additionally, the 106th Regiment arrived on June 20, and Aslito Airfield became operational, putting the security of the Japanese home islands in jeopardy. The following day involved reorganizing, resupplying, mopping-up, and patrolling to prepare for the next day's attack into central Saipan. General Smith's infantry continued their offensive south toward Nafutan Point, making incremental progress through each cave and ravine. 

At 12:15, while engaged in the Nafutan Point attack, the 27th Division received a change of mission and disposition. NTLF Operation Order 9 dictated less one battalion and one light tank platoon, to assemble northwest of Aslito Airfield in NTLF reserve. Control of the division artillery would pass to the 23rd Corps Artillery. The designated infantry battalion was ordered to “operate in the Garrison Area and mop up remaining enemy detachments, maintain anti-sniper patrols within the Garrison Area and along the coast line to protect installations within its zone of action with particular attention to Aslito Airfield.”

At 5:00, after consideration of the NTLForder, Ralph Smith telephoned Holland Smith and urged that a complete regiment be used to clean up Nafutan Point, rather than one battalion. He said that he planned to use the 105th Infantry for the job and that he believed they could finish in a couple of days. Holland Smith agreed to this but specified that one battalion of the 105th must be retained in reserve for possible use elsewhere. For this task, the 2nd Battalion would be selected. This modification was later confirmed in a mailbrief from NTLF which arrived at the 27th Division command post at 8;30, 22 June. Ralph Smith then issued an order to his division, the 105th will hold the present front line facing Nafutan Point, with two battalions on the line and one battalion in regimental reserve. It would relieve elements of 165th now on the front line by . Reorganization of the present front line to be effected not later than 11:00, 22 June and offensive operations against the enemy continued. Reserve battalion will maintain anti-sniper patrols in the vicinity of Aslito Airfield. 

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The Battle of the Philippines  was the last hurrah of the once proud IJN carrier fleet that had humbled the American two and a half years earlier. Admiral Spruance's strategic patience led to a decisive American victory. Japan's carrier threat, which had driven its early wartime expansion, was annihilated in the Great Marianas Turkey Shoot.