- 170 - Pacific War Podcast - Invasion of Iwo Jima - February 18 - 25 - , 1945

Last time we spoke about the liberation of Bataan and Corregidor. The Shimbu Group's commander launched a coordinated raid on northern Manila, aiming to weaken enemy defenses. Despite heavy casualties, the Allies captured key locations, including Nichols Field. Meanwhile, General Chase's 38th Division overcame strong Japanese defenses at ZigZag Pass, while General Hall's forces secured Bataan. Plans for an airborne assault on Corregidor were set for February 16, leveraging surprise against the outnumbered Japanese garrison. American forces launched the strategic attack on Corregidor, dropping paratroopers from the 503rd Regiment. Despite facing sporadic fire, they secured key positions. The following days saw intense skirmishes as the 3rd Battalion, 34th Regiment landed and established a foothold. Over eight days, they repelled numerous Japanese counterattacks, inflicting heavy casualties. By February 26, organized resistance crumbled, leading to the island's capture. Meanwhile, in Manila, American troops advanced, clearing buildings and securing the city, inching closer to victory in the Philippines.

This episode is the Invasion of Iwo Jima

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. 

 

A few weeks ago we spoke about Operation Detachment. Admirals Nimitz and Spruance were planning an invasion of Iwo Jima with General Schmidt’s 5th Amphibious Corps. During a thorough campaign of preliminary air and naval bombardment against the Volcano Islands, the 4th and 5th Marine Divisions, along with other Corps units, were loading at Hawaii between December 25 and January 25. Once training and loading were complete, Admiral Turner’s Task Force 51 and Admiral Hill’s Task Force 53 left Pearl Harbor on January 27, initially heading toward Saipan. By February 12, Admiral Spruance’s 5th Fleet had gathered in the Marianas and was prepared to sail for Iwo Jima. Additionally, Admiral Mitscher’s Task Force 58 had departed Ulithi to conduct a series of supporting air strikes over and around Tokyo, known as Operation Jamboree. Task Force 58 sortied from Ulithi 10 February and shaped a course eastward of the Marianas and Bonins. On the 12th, the air groups rehearsed with the 3rd Marine Division on Tinian. Two days later the task force fueled at sea from one of Admiral Beary's replenishment groups. Everything possible was done to guard against detection. Measures included radio deception, scouting by Pacific Fleet submarines to dispose of any picket vessels there might be en route, scouting by B-29s and Navy Liberators from the Marianas to clear the air. On the 15th a scouting line of five destroyers ranged ahead of the carriers, and antisubmarine air patrol was set up. At 1900 a high-speed run-in began towards launching positions, where the carriers arrived at dawn 16 February. Thanks to these precautions, and to thick weather most of the way, they arrived undetected.

General LeMay’s 21st Bomber Command, which was being reinforced by the 313th and 314th Bombardment Wings, would also assist Detachment with several strikes against Japan. Following some unremarkable high-altitude daytime missions in late January, 129 B-29s from the 73rd and 313th Bombardment Wings targeted Kobe on February 3, using a mix of incendiaries and fragmentation bombs. This attack caused significant damage to the urban area and local war production, resulting in the loss of 2 bombers and damage to 35 others. Subsequently, on February 10, a precision strike was launched against Ota’s Nakajima aircraft factory, with 84 out of 118 dispatched B-29s successfully bombing the site. However, only 14% of the bombs hit the target, leading to the loss of 12 bombers and damage to 29. Nearly one-third of the factory buildings sustained damage, primarily from the incendiaries combined with high-explosive bombs.

Five days later, LeMay dispatched 117 B-29 bombers to target Mitsubishi's engine works in Nagoya. However, an unexpected cold front resulted in only 33 bombers reaching the target area, yielding lackluster results. Meanwhile, after conducting some assault rehearsals, Spruance’s amphibious support forces and tractor groups set sail for Iwo Jima on February 14, followed two days later by Turner’s main assault convoy. At the same time, the reserve 3rd Marine Division continued loading at Guam, with its 21st Marines departing for Iwo Jima on February 16, followed by the main body of the division the next day. On the morning of February 16, Admiral Blandy’s Amphibious Support Force arrived off Iwo Jima and promptly commenced the final preliminary bombardment and minesweeping operations, although inclement weather hindered these efforts. However, the next day, Task Force 52 successfully carried out these missions; beach reconnaissance by UDTs faced heavy mortar fire, resulting in the sinking of one LCI gunboat, damage to eleven others, and casualties of 44 killed and 152 wounded. Despite this, the frogmen encountered no obstacles on the beaches and managed to create accurate maps of the approaches. Meanwhile, by February 16, Mitscher’s carriers had quietly moved to a position 60 miles off the coast of Honshu, launching extensive fighter sweeps against airfields in Tokyo Bay and bombing raids on aircraft frame and engine plants in the Tokyo area. 

About 100 Japanese fighters attacked Admiral Davison's planes as they crossed the coast and about 40 of them were shot down. American pilots found the Japanese on the whole reluctant to engage; Admiral Mitscher had correctly told his pilots, "He is probably more afraid of you than you are of him". In fact the IJAAF 10th Hiko Shidan immediately ordered an IJAAF night-fighter group and all “second-class” personnel to take cover, while all aircraft not intercepting were ordered to be dispersed, fuel tanks drained, and ammunition unloaded. In contrast, American pilots reported Tokyo antiaircraft fire “the most accurate and intense yet encountered.” By nightfall, Rear-Admiral Matthias Gardner’s night-flying carrier group conducted a sweep of night fighters to cover the enemy airfields at dusk. This operation was repeated the following morning, but poor weather ultimately forced the carriers to retreat toward Iwo Jima.

Despite this, significant damage was inflicted on aircraft frame and engine facilities, with 10 vessels sunk, including the unfinished escort carrier Yamashio Maru. A total of 531 aircraft were reported destroyed, at the expense of losing 88 planes and damaging two destroyers. On February 18, after the enemy battery camouflage had been obliterated during the previous two days of bombardment. This revealed batteries not previously known to exist, the island's defenses were for the first time properly revealed; and formidable they were indeed. Fortunately for the Americans, the support of UDTs with LCI gunboats had convinced General Kuribayashi that the main landing had started, and to repel it he unmasked batteries that would have caused very heavy casualties on D-day had they not been discovered two days before. This was the only serious mistake made by the Japanese general in his defensive tactics, which won the rueful admiration of his enemies.

Blandy opted to focus on the immediate area and flanks of the eastern beaches. Heavy ships moved closer to 2,500 yards to deliver concentrated direct fire on all targets. Consequently, bombardment ships provided continuous direct fire throughout the day, effectively dismantling enemy defenses. However, during the night, the Japanese launched a minor raid that caused significant damage to the destroyer minesweeper Gamble and the destroyer escort Blessman. At 06:00 on February 19, Turner’s main force arrived off Iwo Jima and began maneuvering into final positions. Simultaneously, Admiral Rodgers’ warships executed the last pre-landing bombardment, coordinated with air strikes from Mitscher’s carriers. Between 08:25 and 08:55, as the first wave crossed the line of departure and advanced toward the shore under the protective rocket fire of gunboats, shells fell heavily on Iwo Jima, marking the most intense pre-landing bombardment of World War II. At 08:57, as the leading armored amtracs approached their targets, naval gunfire shifted inland and to the flanks. The LVTs of the first wave touched down on Iwo Jima at 09:02 and began moving forward through the high terraces of soft black volcanic ash, engaging inland targets from the water to support subsequent landings. Three minutes later, the Marines of the 4th and 5th Divisions started landing side by side on the Green, Red, Yellow, and Blue beaches.

The assault infantry battalions of the Landing Force received assistance throughout D-Day from all the supporting arms available to the Amphibious Support Force. Carrier pilots of Task Force 58 and the escort carriers of Task Force 52 flew missions all day as airborne observers and spotters maintained constant vigilance over the target. Including pre-H-Hour strikes, 606 support aircraft flew 26 missions on February 19 and dropped 274500 pounds of bombs. These planes also fired 2254 rockets into the island defenses and dropped over a hundred napalm bombs. Air and naval gunfire liaison teams remained in communication with both air and sea supporting units through the hectic hours that followed the beach assault. Naval rifles from 5- to 16-inch caliber pounded enemy positions in response to Marine requests. Gunfire support vessels engaged enemy artillery that covered landing areas from high ground to the north, and concentrated on concealed Japanese mortars that shelled landing areas with deadly effect.

The units quickly reorganized and began their advance inland, facing only light resistance, although their progress was hampered by the sandy terrain. General Kuribayashi’s forces, however, had been waiting in well-fortified underground positions as planned, emerging only after the bombardment ceased to unleash a barrage of machine-gun, rifle, and mortar fire on the advancing troops. As the initial waves of Marines struggled to advance, congestion along the shore became increasingly critical, while the full force of the Japanese defenders was unleashed shortly after 10:00. By 10:30, elements from all eight assault battalions had landed on the island, successfully bringing ashore about 6,000 men and bulldozers that were clearing paths for tank deployment. On the far left flank, Colonel Harry Liversedge’s 28th Marines, having landed on Green Beach, initiated a rapid advance across the half-mile isthmus below Mount Suribachi to isolate this crucial position. The attack unfolded in such a way that some units were delayed while others managed to break through and continue westward despite suffering heavy casualties, ultimately crossing the island while the bypassed enemy was being dealt with. By midday, the reserve 3rd Battalion and tanks landed under heavy fire to join the afternoon assault on Suribachi, but intense enemy fire hindered their progress to the assault positions. Consequently, the 2nd Battalion launched an attack on its own, gaining only 150 yards before retreating to regroup with the 3rd Battalion for the night.

At the same time, Colonel Thomas Wornham’s 27th Marines had landed on the Red Beaches, making swift progress inland despite increasing casualties and bypassing numerous enemy positions. By 11:30, Company A was moving across the southern end of Airfield No. 1, establishing a presence along the western edge while other units continued to advance past the airfield. The 1st Battalion launched an attack on the airfield with tank support but faced strong enemy resistance, resulting in minimal gains. Meanwhile, the 2nd Battalion pushed westward and reached the cliffs overlooking the western coast. Additionally, the reserve 3rd Battalion landed and began clearing bypassed positions, while the artillery units from the 13th Marines and General Rockey’s reserve 26th Marines also arrived in the afternoon as the 27th and 28th Marines solidified their positions. By nightfall, although the 5th Marine Division was still a considerable distance from the O-1 Line, it had established a firm foothold on the island, with Mount Suribachi isolated and portions of the airfield under their control. To the east, General Cates' 4th Marine Division also landed successfully, with Colonel Walter Wensinger’s 23rd Marines coming ashore at the Yellow Beaches and Colonel John Lanigan’s 25th Marines landing on Blue Beach 1 and the southern part of Blue Beach 2. The two regiments began their advance inland, hindered by intense enemy fire but managing to gain between 400 and 600 yards by midday. As tanks were being deployed, the 3rd Battalion of the 25th Marines moved to the right to clear the remaining area of Beach Blue 2 and encircle the threatening quarry zone.

At this stage, as the assault battalions continued their advance, Wensinger and Lanigan deployed their reserve battalions to cover the gaps in their attack lines. With the support of tanks that had finally reached the front, the 23rd Marines advanced towards Airfield No. 1 and successfully captured its outskirts. Meanwhile, the 25th Marines initiated a coordinated assault, with the 3rd Battalion advancing about 200 yards along the beach to secure the problematic quarry, while the other two battalions moved north to seize the high ground to the northwest of the quarry. By the end of the day, Cates had also landed half of the artillery from the 14th Marines, along with his reserve 24th Marines, which began to relieve some of the frontline units from both assault regiments. Although the penetration by the 4th Marine Division was not as extensive as intended, by nightfall, the front lines included the eastern edge of the airfield and extended sufficiently inland from the Blue Beaches to ensure the beachhead could be held successfully. The Marines, forced to advance across open terrain while enduring intense fire from well-concealed positions that were difficult to target, fell significantly short of the O-1 objective. Nonetheless, by the end of the day, six Marine regiments, an equal number of artillery battalions, and two tank battalions had landed and were positioned to defend the narrow beachhead against a potential night counterattack. 

Throughout this first day, the situation on the beaches prevented landing of any but the highest priority "hot cargo." This consisted of ammunition, rations, water, and signal equipment brought to the beach in LCVPs and LCMs. Shore party teams, working under extremely adverse conditions without sufficient trucks and other heavy equipment, could do little more than stack the supplies on the beach above the high water mark. LVTs and weasels made trips from the beach dumps inland carrying these supplies to the troops and returned bearing wounded men. The busy amtracs also made nonstop trips from LSTs, ferrying critically needed items direct to Marines on the front lines. Most of the transports and other vessels of the task force retired from the island at nightfall, but some command ships, preloaded LSTs, and hospital LSTs remained behind. Emergency items, especially 81mm mortar ammunition, were brought in during the night, but actually very little unloading was accomplished and many of the wounded spent this night on the beach because they could not be evacuated. Some progress was made cutting exits through the terrace and clearing mines, but enemy fire and the shortage of equipment limited this activity. Despite this, the Japanese did not launch any large-scale assaults, although their mortars and artillery relentlessly bombarded Marine lines along the front throughout the night. Consequently, Allied casualties on this first day totaled 548 killed and 1,755 wounded.

On February 20, the goal was for the 28th Marines to take Mount Suribachi while other units advanced north to capture the two airfields. Initially, in the south, after a coordinated air and naval bombardment, Liversedge launched another assault on the volcano but managed to gain only 75 yards by midday. During the forenoon, Marines gained only 50-70 yards. Aircraft and ships pounded Japanese positions and the 3d Battalion, 13th Marines fired mission after mission, but stiff enemy resistance continued, particularly from well-camouflaged pillboxes hidden in the brush to the front of the Marine lines. These emplacements, too close to friendly troops to be engaged by heavy support weapons, could only be silenced by coordinated attacks of assault demolition teams using flamethrowers and explosive charges.

Tanks then moved in to provide support, allowing the attack to progress from pillbox to pillbox; however, by the end of the day, the Marines had only advanced 200 difficult yards. Meanwhile, Schmidt’s other regiments initiated a coordinated offensive to the north following extensive artillery, naval gunfire, and air support. Despite facing heavy resistance, the 23rd Marines successfully overran most of Airfield No. 1 by noon. Wensinger continued to push his units in the afternoon, but progress was limited as tanks were hindered by minefields and rough terrain. Wornham’s 27th Marines pressed their attack on the left flank, overcoming enemy mortar and artillery fire to gain about 800 yards along the coast. In contrast, Lanigan’s 25th Marines, affected by friendly fire, made only minimal advances against enemy crossfire from concealed positions. At 1600, friendly planes misdirected their fire to the 25th Marine’s area, adding terror to the situation. An air strike consisting of .50-caliber machine-gun strafing, rockets, and bombs fell on troops of Company B of the 24th Marines, which was positioned on top of the quarry some 400 yards inland from the eastern shore. This strike was made without a preliminary "dry-run", and despite the fact that yellow front line panels were displayed prior to and during the aerial attack. The 1st Battalion, 24th Marines suffered five killed and six wounded as a result of this misguided effort. Shortly after the planes left the area, this battalion reported that friendly artillery and naval gunfire was being registered on its lines. Due to the slow progress, Schmidt attempted to land his reserve 21st Marines, but high seas and congested beaches ultimately thwarted these efforts. Nevertheless, the remaining 14th Marines were landed, albeit with significant casualties, and elements of the corps artillery began to come ashore. During the night, there were no counterattacks on Mount Suribachi, but the 4th and 5th Marine Divisions had to fend off some small counterattacks on their front lines.

On February 21, following a strike involving 40 aircraft, Liversedge’s 28th Marines launched another assault on the volcano. The 1st Battalion on the right swiftly advanced along the west beach to the base of Suribachi, while the 3rd Battalion in the center pushed nearly to the foot of the mountain despite facing heavy resistance. Meanwhile, the 2nd Battalion on the left moved cautiously along the east beach toward the volcano's base, with Company F heading toward Tobiishi Point. At the same time, other regiments continued their offensive towards O-1 after a bombardment from air, artillery, rockets, and naval gunfire. Rockey’s units made significant progress, advancing over 1,000 yards, while the 23rd Marines achieved similar gains on the left flank, where slightly sheltered areas allowed for local and limited encirclement, but only advanced 100 yards in the right and center. The 25th Marines maintained steady pressure against the strong enemy defenses, gaining between 50 and 300 yards across the front. Colonel Hartnoll Withers’ 21st Marines successfully landed this time; due to heavy casualties in the center, they were assigned to relieve the exhausted 23rd Marines. By nightfall, the Marines had to fend off several local counterattacks and infiltration attempts. 

During the night, 50 kamikaze planes targeted Blandy’s Task Force 52. They were picked up by the radar of the USS Saratoga, a veteran carrier of the Pacific War, and six fighters were sent to intercept. They shot down two Zeros but the remaining Zeros plowed on through the low lying cloud, two of them trailing smoke, and slammed into the side of the carrier turning the hangers into an inferno. Another solitary attacker smashed into the flight deck leaving a gaping hole 100 yards from the bow. Damage control teams worked wonders and within one hour the fires were under control and the Saratoga was able to recover a few of her planes. Another aircraft, a "Betty" twin engined bomber, tore into the escort carrier USS Bismarck Sea. The decks were full of aircraft and the ensuing explosion caused uncontrollable fires. Abandon ship was sounded and 800 men went over the side. Within a few minutes a huge explosion ripped off the entire stern of the carrier and she rolled 38 over and sank. Three other ships were also damaged: the escort carrier USS Lunga Point was showered with flaming debris as four aircraft were blasted out of the sky; the minesweeper Keokuk was damaged when a "Jill" dive bomber hit her deck; and LST 477 loaded with Sherman tanks received a glancing blow. The Saratoga, with destroyer escort, returned to Pearl Harbor, but by the time the damage was repaired the war was over. The kamikazes had done their work well: 358 men killed, one carrier sunk, and another severely damaged. It was a grim preview of the mayhem they would later cause during the invasion of Okinawa in April.

On February 22, amidst a dreary cold rain, Liversedge renewed his assault on Suribachi, where only half of the original garrison remained to oppose the Marine advance. There was no let-up in the weather on Wednesday as Marines of the 28th Regiment, drenched to the skin and bent by the wind, prepared to renew the attack on Suribachi. Fresh supplies of ammunition had been brought to the front during the night, but the Shermans were mired in mud and the Navy declined to supply air support in the appalling weather. It was to be up to the foot soldier with rifle, flamethrower, grenade, and demolition charge to win the day. Colonel Atsuchi still had 800-900 men left and they had no intention of allowing the Americans an easy victory. Major Youamata announced: "We are surrounded by enemy craft of all sizes, shapes and descriptions, enemy shells have smashed at our installations and defenses, their planes bomb and strafe yet we remain strong and defiant. The Americans are beginning to climb the first terraces towards our defenses. Now they shall taste our steel and lead."

Throughout the day, the 28th Marines engaged Japanese positions on the lower slopes of the mountain, with the 3rd Battalion making the final push to the base of Suribachi while the other two battalions cleared the coastline to completely encircle the volcano. Simultaneously, Schmidt’s northern sweep continued, with the 21st Marines replacing Wensinger’s troops, and Colonel Chester Graham’s 26th Marines taking over on the 5th Division front. The 26th Marines advanced approximately 400 yards in the center but ultimately had to withdraw as the flanking units could not progress; the 21st Marines began their assault on the formidable defenses of Colonel Ikeda’s 145th Regiment in front of Airfield No. 2, managing to advance only about 250 yards on the right; and the 25th Marines were unable to launch an attack on the left due to Withers’ lack of significant gains and had to fend off several local Japanese counterattacks. Marine "Howlin' Mad" Smith aboard the USS Auburn was counting the cost. Three days of battle and the Regimental Returns listed 2,517 casualties for the 4th Division and 2,057 for the 5th: 4,574 dead and wounded and the O-1 line had just been reached. Little did he know that as his Marines approached the hills, ravines, canyons, gullies, and cliffs of the north the worst was yet to come. Additionally, as the 4th Division remained stalled, Cates ordered Colonel Walter Jordan’s 24th Marines to relieve the weary troops of Lanigan on the right. During the night, most of Task Force 58 departed the area for a second air strike against Tokyo, which significantly limited the availability of aircraft for direct support of ground forces on Iwo Jima.

On February 23, the 28th Marines under Liversedge launched their final assault on Suribachi. The 2nd Battalion was tasked with scaling the volcano's heights, while the 1st Battalion advanced south around the mountain's western side. To their surprise, they encountered no enemy fire, and small patrols reached the crater's edge by 09:40. 1st Lieutenant Harold G. Schrier, executive officer of Company E, and a 40-man detachment set out to follow the patrols and occupy the highest point of land on Iwo Jima. The number of live Japanese lurking in caves along this north face was unknown, so flankers were sent out to guard against ambush as Schrier's men clawed their way warily upward. Still there was a mysterious lack of enemy activity, and the only Japanese encountered were the harmless dead. Positions along the rim of the crater were reached at about 10:15, and as Marines scrambled over the lip, the tenseness was eased by action. A small defending force challenged the patrol and a short, hot fight developed. Even while this skirmish was in progress, some of the men located a length of Japanese iron pipe, secured a small American flag to one end, and raised the Stars and Stripes at 10:20. It was an inspiring sight for thousands of Americans on Iwo as the flag waved bravely from the summit. Shortly after the mounting of this flag that measured only 54 inches by 28 inches, an unidentified Marine went aboard LST 779, beached near the base of the volcano, to obtain a larger set of colors. As this second and larger (8 feet by 4 feet 8 inches) flag was being carried up the slopes of Suribachi, photographer Joe Rosenthal, who covered the Iwo operation for the Associated Press, noticed it and instantly started in close pursuit. His efforts that morning resulted in the now famous picture of the second flag raising.

Also since it's one of my favorite movies, I wanted to add this passage from the book “Flags of our Fathers” by James Bradley

The Secretary of the Navy, James Forrestal, had decided the previous night that he wanted to go ashore and witness the final stage of the fight for the mountain. Now, under a stern commitment to take orders from General Holland "Howlin' Mad" Smith, the secretary was churning ashore in the company of the blunt, earthy general. Their boat touched the beach just after the flag went up, and the mood among the high command turned jubilant. Gazing upward, at the red, white, and blue speck, Forrestal remarked to Smith: "Holland, the raising of that flag on Suribachi means a Marine Corps for the next five hundred years".

Forrestal was so taken with fervor of the moment that he decided he wanted the Second Battalion's flag flying on Mt. Suribachi as a souvenir. The news of this wish did not sit well with 2nd Battalion Commander Chandler Johnson, whose temperament was every bit as fiery as Howlin Mad's. "To hell with that!" the colonel spat when the message reached him. The flag belonged to the battalion, as far as Johnson was concerned. He decided to secure it as soon as possible, and dispatched his assistant operations officer, Lieutenant Ted Tuttle, to the beach to obtain a replacement flag. As an afterthought, Johnson called after Tuttle: "And make it a bigger one."

Following this, the 28th Marines conducted mopping-up operations to eliminate remaining enemy positions and seal off caves at the base of Suribachi. All accessible outer and inner slopes were covered as the Marines annihilated enemy snipers and blasted shut the many cave entrances, sealing in an uncounted number of Japanese. Much observation equipment was found, emphasizing the fact that this had been an excellent point of vantage from which hostile observers directed murderous fire against the entire beachhead. Marine artillerymen, ready and eager to seize this advantage, hastened to move flash-ranging equipment into position.

By nightfall, approximately 122 Japanese soldiers were killed while attempting to infiltrate American lines. Over the five-day period, the 28th Marines suffered 895 casualties, while nearly 2,000 Japanese were either killed or trapped in over 1,000 caves in the area. Kuribayashi had not anticipated the loss of this strategically significant location so early in the battle, and the survivors who managed to breach American lines faced severe reprimands upon their return to the north. For the remainder of the month, the 28th Marines focused on clearing out stubborn Japanese forces, reorganizing, and reequipping. Meanwhile, fighting in the north persisted as the three assault regiments advanced toward the O-2 Line. The 26th and 21st Marines faced heavy fire and struggled to make progress, while the 24th Marines advanced along their entire front, gaining up to 300 yards in some areas. On this day, the situation on the beach steadily improved as clearance efforts, construction of exits, and unloading continued, facilitating the arrival of essential ammunition and an additional 25 tanks.

On February 24, following extensive air, naval, and artillery preparations, the offensive resumed. However, the initial failure of tanks to join the assault due to minefields and heavy anti-tank fire forced the Marines to advance slowly under intense fire from various sources. In the center, the 3rd Battalion, 21st Marines advanced 800 yards, reaching the north side of the east-west runway of Airfield No. 2, while the 2nd Battalion gradually moved northward around the end of the runway by noon. In the afternoon, as tank support began to arrive, Withers’ 3rd Battalion captured the hill north of the airstrip after a fierce hand-to-hand battle. Simultaneously, his 2nd Battalion coordinated with the 26th Marines to seize the elevation beyond the airfield. Graham’s troops easily secured the ground in front but had to pause their advance when they found themselves about 400 yards ahead of the 21st Marines. On the right flank, the 24th Marines initially made significant progress alongside Withers’ men toward the airfield but were ultimately halted by the strong defenses on Charlie-Dog Ridge. 

Running along the southeast edge of the east-west runway of Airfield Number 2 was a ridge known only as "Charlie-Dog Ridge." In prolongation of this ridge, on a lower level to the southeast, was a semicircular rise of ground that formed the "Amphitheater." In this area, Japanese engineers had constructed some of the most formidable defenses on the island. From the south, the approach traversed bare flat ground swept by guns on the ridge. To the east, the route led across a weird series of volcanic outcroppings and draws. It was against these positions that the 24th Marines moved out on D-plus-5. Assault squads then had to methodically clear the ridge, moving from one strongpoint to another, using fire and explosives until Charlie-Dog was secured. While the overall gains for the day were notable by Iwo Jima standards, the casualty figures were also high, with the Marines suffering 1,034 killed and 3,741 wounded during the five-day push to the second airfield. Additionally, the remainder of General Erskine’s 3rd Marine Division began landing that day to officially take control of the central area.

On February 25, a decision was made to hold back the 26th Marines to allow the 3rd Division to align with them. After another intense bombardment, Colonel Howard Kenyon's 9th Marines advanced through the 21st to continue the assault, but the two-battalion attack only managed to gain a meager 100 yards against Ikeda's determined defenders. Kenyon then deployed his reserve 3rd Battalion in the center, but it also failed to break through. To the east, the 23rd and 24th Marines launched simultaneous attacks, but only the 23rd made significant progress, overrunning the eastern end of the strip and establishing a foothold on the high ground to the north. Meanwhile, in the morning, Mitscher's carriers conducted a second strike on Tokyo.

The Japanese sighted 600 US carrier aircraft on February 25, but Rear Admiral “Ted” Sherman reported, “The enemy opposition was only halfhearted and Japanese planes which were not shot down seemed glad to withdraw from the scene … as swiftly and unceremoniously as possible. Even here, over their own capital, the enemy were notably inferior to our naval aviators in aggressiveness, tactics, and determination.” TF-58 aircraft hit the Ota and Koizumi aircraft plants, but increasingly snowy, stormy weather meant Mitscher canceled further Tokyo strikes at 1215hrs. Spruance and Mitscher decided to hit Nagoya instead. En route to Nagoya that night destroyers USS Hazelwood and Murray sank three small Japanese craft. Eventually Mitscher realized TF-58 would not reach launching position on time, and at 0530hrs Spruance and Mitscher canceled the Nagoya strikes and headed south to refuel. TF-58 claimed 47 Japanese planes shot down and 111 destroyed on the ground for a total of 158 Japanese planes destroyed on February 25. Two hangars, one radar station, and two trains were destroyed. About 75 percent of the Ota engine plant’s buildings were destroyed and an additional 15 percent heavily damaged. The Koizuma plant had also been heavily hit, and five coastal vessels and several smaller craft sunk, with another 14 vessels damaged. Total US losses were nine aircraft to antiaircraft fire and four to operational causes; four pilots were lost.. After TF-58 aircraft had plastered the Nakajima Ota airframe plant with 45 tons of bombs, February 25 photoreconnaissance revealed Ota to be 60 percent destroyed and 30 percent heavily damaged, although half of this was believed due to B-29s. After the photos TF-58 aircraft dropped another 13 tons on the plant. The Nakajima Koizuma plant was attacked on February 25 with 35 to 40 tons of bombs, with hits concentrated in the center of the plant. Reconnaissance showed 20 percent of the Koizuma roof damaged. The Hitachi–Tachikawa aircraft engine plant was attacked by one Task Group strike, with US airmen reporting “excellent results.” Photographs showed many bomb hits, but smoke made precise damage assessments difficult. Slight damage was also inflicted on the Tachikawa airframe plant. TF-58 planes struck the B-29s’ nemesis, the Musashino-Tama aircraft engine plant, with 40 tons of bombs in the center of the Tama complex. 

On that day, LeMay also dispatched 231 B-29s to attack Tokyo with incendiaries, with 172 successfully dropping 453.7 tons of bombs, incinerating a square mile of the city. This operation served as the "conclusive" test of the incendiary bombs that the 20th Air Force had requested, with valuable lessons to be learned for future use. The next day, the 26th Marines resumed their attack despite the high ground on the left remaining unclaimed, successfully advancing over 300 yards in the right and center. In the center, the 9th Marines continued their assault with the 1st and 2nd Battalions side by side, but they made no notable gains.

On the right flank, the 23rd Marines launched another assault towards Hill 382, facing heavy resistance and managing to advance only about 200 yards. Concurrently, Lanigan’s 25th Marines moved through the battered 24th Marines, achieving an advance of approximately 100 yards before encountering intense machine-gun fire from the Amphitheater and Turkey Knob. On February 27, Wonrham’s 27th Marines took over from the exhausted 26th and continued to push northward despite rising casualties, successfully overrunning several strongpoints and gaining about 500 yards across the front. In the center, the 9th Marines finally breached the enemy's main defenses towards Hill 199-O and captured Hill Peter, securing Airfield No. 2. Meanwhile, on the right, the 4th Division pressed on against the heavily fortified Japanese positions at the Meatgrinder, advancing only 150 to 200 yards on each flank while struggling to make headway against the Amphitheater and Turkey Knob. In the final attack of the month, the 27th Marines advanced towards Hill 362A, reaching its base but were forced to retreat nearly 100 yards due to Japanese counterattacks and loss of communication. In the center, Withers’ 21st Marines moved past the 9th Marines and rapidly advanced north of Airfield No. 2, making significant progress on the right as they swept through Motoyama village and captured the high ground overlooking Airfield No. 3. To the east, Cates continued to send troops into the Meatgrinder, with the 23rd Marines gaining over 200 yards and launching an attack on Hill 382, while the 25th Marines struggled to make any headway against the Amphitheater and Turkey Knob, achieving only minor gains along the coast.

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And thus we have begun one of the most brutal battles of WW2, let alone the Pacific War. It was a controversial decision to invade Iwo Jima and the Americans could never have predicted how the Japanese would change their tactics to turn the entire ordeal into one giant meat grinder.