- 120 - Pacific War - The battle of Imphal, March 5-12, 1944

Last time we spoke about the invasion of the Admiralty Islands and some action on New Britain and Bougainville. The last steps of operation Cartwheel would see the Bismarck-Solomon area sealed off with the capture of the admiralty islands. MacArthur was yet again trying to seize the initiative and force a drive upon the Philippines. A diversionary landing was made against Momote and Los Negros would cost 116 lives, 434 wounded by March 8th. On New Britain, General Rupertus began new amphibious assaults and other actions to cut off the retreat for the Japanese defenders. Then on Bougainville, under immense pressure from his superiors, General Hyakutake prepared to launch his main counterattack, codenamed Operation TA. He assembled 15,000 men who would hit the American defensive perimeter to dislodge the enemy from the island. Was this idea even feasible, or would it all end in a terrific disaster?

This episode is the battle of Imphal

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. 

The war was not going well for the Japanese in 1944. They were on the cusp of being dislodged from the south pacific. Rabaul and Truk were effectively neutralized and the Americans were making enormous strides in the central pacific, seen in the Gilberts and Marshall campaigns. Even in Burma, a war front the Japanese had basically been winning every battle flawlessly, was now suffering defeats. The first defeats were found in the Hukawng Valley and Arakan region. In the face of these terrible defeats, the Japanese General Mutaguchi argued he had the answer. 

Mutaguchi, a victor over the Singapore campaign, had wargamed the possibility of invading India and won support of some of his superiors in Tokyo. His reasoning had been to brush past the British in Assam, to storm the gateway into the subcontinent, where hopefully the Indians would rise up to greet the Japanese as liberators. With Subhas Chandra Bose and his Indian National Army, the Japanese could rally the Indians to turn against the British. The collapse of India would be a killing blow against Britain's influence in Asia. Initially it was also believed, such a move would allow the Japanese to link up with the Axis forces in Persia. Such fantastical ideas were farfetched even for 1942 standards, but in 1944 these were laughable. Stalingrad and Kursk had effectively turned the Eastern Front completely around, the Germans were fighting for their survival. Yet this all did not dissuade Mutaguchi. 

Lt General Hanaya Tadashi was placed in charge of the Arakan region. Hanaya was tasked with deceiving the British into believing the counter attack in Arakan was an attempt to invade India, thus dragging units out of Imphal. The Operation was codenamed HA-GO, an intended feint, to mask another operation, U-GO to invade Imphal. To pull it off the assault in Arakan was made to be massive. Slim was forced to meet the enemy fiercely in Arakan, he had no choice but to pull his reserves out of Imphal. The Japanese were delivered a nasty surprise with the Admin Box tactic. For over 18 days the battle raged around the Admin Box, but the Japanese could not make a dent. The Japanese forces had expected once the British saw their lines of communications cut and were outflanked they would panic and flee. It was after all what had been occurring for years in Burma. The Japanese hoped to annihilate the 15th corp, but instead the British dug their heels in. Once again victory disease sprang its head force, the arrogant and overly confident Japanese, bit off more than they could chew. It was as if they were facing a brand new opponent. The Admin Box was hit by infantry and aerial attacks, the casualties were terrific, but the Admin Box never wavered. The Japanese had planned for a lighting battle, traveling light and seizing supplies on the go, but the British did not roll over. The Japanese began to run out of supplies, starvation loomed over the invaders. Casualties on both sides increased sharply, and Slim predicted the Japanese would not allow for defeat and instead would redouble their efforts. By February 13th, Slim was confident victory was in their hands as the 26th Indian division began to arrive to deliver a hammer blow with the Admin Box as the anvil. The Japanese fought desperately, but by the 24th they were withdrawing leaving 5000 dead. After defeating the Japanese Slim unleashed his own operation into the Arakan and while doing so his men captured some Japanese documents showcasing operation HA-GO in full. Slim now knew the Japanese were feinting him to draw resources away from Imphal

Now Mutaguchi had sold Operation U-GO to his superiors in Tokyo as a pre-emptive strike to disable 14th Army, but in reality it was always to invade India. He also wanted to press the attack farther and take Dimapur, a major supply base through which ran the railway line to Ledo. Taking Dimapur would deal a major blow to the Allies and could potentially open the door to further operations deeper into India. Once they had broken through, the INA would rally local support, enabling them to extend the fight to the British in Assam, Bengal and beyond. For his Operation U-Go, Mutaguchi thought he could outsmart the British in terms of how he would approach Imphal. His plan called for the 33rd Division of Lt General Yanagida Motoso to begin an advance on March 8th attacking from the south. It was presumed the British would expect this and rush reinforcement when attacked. Meanwhile he planned to send the 15th division under Lt General Yamauchi Masafumi a week later to ford the Chindwin River and advance on Imphal from the north. Even further north the entire 31st division of Lt General Sato Kotoku would also ford the Chindwin between Homalin and Tamanthi, advancing northwest to block the main British supply route in the hills at Kohima. 

To pull all of this off, Mutaguchi needed to ensure his forces captured Imphal before the monsoon rains made the jungle tracks impassable. He did not have much in terms of supplies to give to his 3 divisions. By 1943, the supply route into Rangoon by sea through the Bay of Bengal had become too dangerous because of attacks by Allied submarines, so the supplies had to rely on the railway being constructed by forced labor and POWs from Thailand. Mutaguchi was well aware of these issues. He knew, however, from personal experience in Malaya and Singapore, that taking logistical risks against the British could bring great rewards. This was because the British, who were usually immeasurably better supplied than the Japanese, frequently left behind large quantities of what the latter referred to as Chachiru kyuyo 'Churchill Rations' in their haste to flee the advancing Japanese. Accordingly, the capture of British supply dumps around Imphal formed a key assumption in his planning. The essence of Mutaguchi's plan was speed - totsusbin ‘swift onslaught' - for if these vast depots were not seized as a matter of priority, the whole offensive would literally run out of fuel. He thought it would take no more than three weeks for his forces to fall on the British supply dumps. Without the capture of these supplies success could not be guaranteed, but it seemed increasingly inconceivable to Mutaguchi that a decisive, overwhelming attack against Imphal would not bring with it rapid and substantial rewards. At no time was he concerned that he might not capture the vast British depots needed to fuel his advance. Imphal needed to be taken by April 10th or it would all be a disaster

General Slim planned for his 14th Army to make a stand at Imphal, taking the hit on the chin as they say, before pushing the enemy back. He needed to draw the Japanese in the Imphal Valley, in a tight circle so he could launch an effective counteroffensive. Lt General Geoffrey Scoones 4th corps would deploy the 20th Indian division led by Major General Douglas Gracey around Tamu and the 17th Indian Light Division of Major General David Punch Cowan around Tiddim. Both divisions had been aggressively carrying out patrols in the valley and along the banks of the Chindwin River. The 23rd Indian Division of Major General Ouvry Roberts was held in reserve at Imphal, with his 49th brigade in the Ukhrul area to the northeast. 

Once Mutaguchi’s offensive kicked off, Slim planned for his two southern divisions to withdraw up the Tamu-Palel and Tiddim roads to go on the defensive around the Imphal Valley. The two divisions would have a short and more secure line of communications and supply behind them as they forced the Japanese to extend them self over the mountains. To counter losing the overland supply line from Kohima, Slim planned to use air supply to maintain his men during the long siege. Slim also expected Mutaguchi to send a single regiment to seize the defenseless Kohima, not an entire division that was further tasked with pouring down into the Brahmaputra valley. That last part would put his entire plan in jeopardy.

On March 8th, Operation U-Go was kicked off with Lt General Yanagida Motoso’s 33rd division beginning their advance in 4 columns. The left column was the 215th regiment led by Colonel Sasahara Masahiko who advanced south of Tiddim before swinging north towards the village of Singgel. They would come across the large supply deport between the milestones 109 and 110 around the Tiddim road. The central column consisted of the 214th regiment led by Colonel Sakuma Takayoshi, advancing up the Kabaw Valley to assault Tonzang. Following this column up was the Fort White Garrison unit led by Colonel Yagi Shigeru. Both columns would cut off the route of withdrawal of Major General David Cowan’s 17th division and annihilate it. Lastly the right column consisting of the Yamamoto Force led by Major General Yamamoto Tsunoru. They would be advancing north up the Kabaw valley to assault Major General Douglas Gracey’s 20th Division on the Tamu-Palel Road. There had been early reports from scouts that groups of Japanese soldiers were advancing west of the Tiddim road. This only sounded off the alarm bells for the 14th corps on March 12th, after a verified sighting report was made stating a large group of Japanese were just a few kilometers off the road at Milestone 109. 

Consequently, Scoones ordered Cowan to withdraw, so the 17th would begin to move from Tiddim on March 14, after laying mines and booby traps. But it was too late, as the Japanese had already cut the Tiddim Road earlier that morning, so Cowan would have to fight its way out to Imphal. That day, Yamamoto Force had also started attacking Gracey’s southern front-line positions, with a particular tank-on-tank battle developing between a troop of M3 Lee/Grant tanks of the 3rd Carabiniers and some six light tanks of the 14th Tank Regiment. The latter were trounced in the end, with four tanks destroyed and two captured. Meanwhile on the 15th, Lt General Yamauchi Masafumi’s 15th division began fording the Chindwin river at Thaungdut and Sittaung and would descend upon Imphal from the north. Lt General Sato Kotoku’s 31st division also forded the river further north at Homalin, Kawya nad Tamanthi and were rapidly advancing towards Kohima and Ukhrul. 

Just as Mutaguchi had guessed, Scoones ordered his 37th and 49th brigades to advance to the Tiddim road to help Cowan’s men. Cowan had sent his 63rd indian brigade to attack the 214th regiment at Tonang and Tiutum. Thai left Imphal and Ukhrul with little protection, so Scoones decided to dispatch the newly arrived 50th indian parachute brigade of Brigadier Maxwell Hope-Thomson to defend Ukhrul, but he did not expect them to find a real fight. Ukhrul would only have the lightest of garrisons and no real defenses. Forces in the area comprised two battalions of the newly raised and part-trained 50th Indian Parachute Brigade whose young and professional commander, 31-year-old Brigadier Maxwell 'Tim' Hope-Thomson had persuaded the powers that be in New Delhi to allow him to complete the training of his brigade in territory close to the enemy. At the start of March the brigade HQ and one battalion had arrived in Imphal, and began the leisurely process of shaking itself out in the safety of the hills north-east of the town. To the brigade was added the 4/5th Mahrattas under Lieutenant-Colonel Trim. Sent into the jungle almost to fend for themselves, it was not expected that they would have to fight, let alone be on the receiving end of an entire Japanese divisional attack. They had little equipment, no barbed wire and little or no experience or knowledge of the territory.

On March 16th, Scoones ordered Gracey to withdraw, so the 20th Division could begin a controlled withdrawal up the Tamu-Palel Road, gradually moving into three defensive boxes.  The first was to be at Moreh, held by the 32nd Indian Brigade; the second in the Khongkhang–Sibong area, held by the 80th Indian Brigade; and the third was to be on the Shenam Saddle, held by the 100th Indian Brigade. Luckily for the allies, Yamamoto had dispatch two of his battalions in a useless wide flanking maneuver towards Mombi and the Tamu-Palel road. Thus Yamamoto would lack sufficient troops to launch a full attack against the retreating allied forces. Meanwhile Hawker Hurricanes and heavy artillery bombarded as the 63rd launched a direct assault against Tuitum saddle, managing to break through to the Manipur River, leaving a rearguard at the bridge. During the following days, the rearguard would repel a series of intense assaults upon the saddle by the 214th regiment and Yanagida’s Fort White column. At the same time the 37th brigade was fighting against the bulk of the 215th regiment around milestone 100. The fighting became very confused as the Japanese units became sandwiched between the allied units who in turn were surrounded by other Japanese units.

On March 18th, the 3rd battalion ,215th regiment managed to capture the supply depot between Milestones 109 and 110 facing minor resistance. Then they were forced to repel a number of counter attacks by the 48th Indian brigade. On the 19th, Hope-Thomson received some panicked reports that his battalions were seeing heavy columns of Japanese advancing on their undefended camp at Sheldon’s Corner. It was the 31st infantry of Major General Miyazaki Shigesaburo from the 58th regiment. Hope-Thomson made a last minute call to assemble his dispersed forces at the deserted Naga Village of Sangshak. His brigade, when concentrated, consisted of 1850 men. However, as the troops dug in they discovered to their discomfort that they were atop an ancient volcano, and the rock was impervious to their picks. All they could dig were shallow trenches, which provided ineffective protection from Japanese artillery. Like all Naga villages that at Sangshak was perched on a hill, and had no water; anything the men required had to be brought up from the valley floor, through the rapidly tightening Japanese encirclement. Its unknown why Miyazaki diverted his men to hit Sangshak rather than continue towards Kohima. By nightfall of the 22nd, the Japanese infantry overwhelmed Indian defenses without performed a detailed reconnaissance and lacking artillery support. This would prove to be a fatal mistake. 400 Gurkhas of the 153rd parachute battalion began mowing down wave after wave of Japanese troops using machine gun fire. The Japanese 8th Company of 58th lost 90 out of 120 men in the space of just 15 minutes. Suffering tremendous casualties, seeing entire companies decimated, Miyazaki decided to regroup and began tossing numerous frantic efforts to break up the defenders positions.Under heavy mountain artillery fire and unable to be supplied by air, Hope-Thomson’s troops grimly held a position that was not even ringed by barbed wire until March 26, when they finally received Scoones’ order to pull out. 

The Parachute brigade was being virtually destroyed in four battles at Sangshak, suffering 652 casualties. Yet in turn Miyazaki was served nearly 1000 casualties and his advance upon Kohima was held up for a week, severely delaying Sato’s plans. Further to the south, Yamauchi’s 60th regiment was also facing stubborn defenses at Sangshak. They actually had been waiting for the battle of Sangshak to conclude and only jumped in on the last day’s assault. This prevented one of Yamauchi’s columns from arriving in time north of Imphal, giving Scoones and Slim an extra few days to prepare Imphal’s defenses. Meanwhile on March 23rd, the 48th brigade used their heavy guns and mortars to hit the Japanese positions and managed to force the 215th regiment to pull away from the valuable supply depot. To secure the depot however, they still needed to clear the road from the north. Gurkha’s were sent in waves against the strongly defended Japanese bunkers, while the 37th brigade and Hawker Hurricanes hit the main defensive positions of the 215th regiment. At this point, General Yanagida, who had always felt that Allied capabilities were being underestimated, determined that his forces would not be able to hold on much longer and thus ordered them to pull back. Yanagida had received a signal from Colonel Sasahara about the critical situation his regiment was in. Sasahara, in turn, had been reacting to a signal from one of his battalion commanders, Major Sueki. Faced with rapidly depleting ammunition, mounting casualties and attacks on his position near Milestone 109, Sueki had signaled that he would not be able to hold on much longer. He indicated that he would destroy his codes and radio and fight to the end. Sasahara is said to have communicated this and the regiment’s resolve to fight to the end to Yanagida. There is some mystery around this signal, some accounts suggesting the division commander received only the latter half of the message. Either way, Yanagida had had enough. All his reservations about the Imphal offensive came to the fore. He ordered the 215th Regiment to pull out and sent a signal to Mutaguchi about his decision. In this he noted the strength of their opponent, questioned the rationale of the operation and remarked on the impossibility of meeting the deadline. He is supposed to have gone so far as to suggest the suspension of the Imphal offensive. This all greatly pissed off Mutaguchi whose divisional commanders for the majority disagreed with his U-GO plan, and Motoso Yanagida openly derided him as an "imbecile". Irregardless, Mutaguchi sought to remove Yanagida from his command. Their relationship would not improve as more setbacks were on the way.

With the Japanese dislodged, the 37th Brigade managed to reopen the Tiddim Road and the 48th Brigade finally secured the entire depot area around Milestone 109. Whatever supplies that could be recovered and transported back to Imphal were grabbed, while as many as possible that could be of potential value to the Japanese were destroyed. On the 26th, the 63rd Brigade’s rearguard also withdrew, blowing up the Manipur River bridge behind them. Two days later, the 37th made first contact with Cowan’s units near Milestone 102 and the 17th Division finally began their retreat towards Imphal. Their only obstacle would be a roadblock established by the 2nd Battalion, 213th Regiment around Khuadam. But that would be cleared out quite easily by Cowan’s men who were able to reach Imphal by April 4th.

In the meantime, Scoones had asked Gracey to send back one of his 100th indian brigade into the reserve on the 25th, leaving him with only two brigades to fend off the Japanese attacks. The next day, the 11th company, 213th regiment of the Yamamoto Force managed to advance past the main defenses at Moreh, defended by the 32nd indian brigade and captured Nippon Hill. Though they were not under heavy enemy pressure, the 32nd Indian Brigade finally withdrew from Moreh on April 1. It had set the dump on fire; by some estimates at least a million pounds’ worth of supplies that had not yet been evacuated were destroyed. They arrived at the Shenam Saddle a few days later to join the 80th Indian Brigade in a fierce battle for Nippon Hill. Meanwhile, Slim had foreseen that reinforcements would be needed at Imphal and Kohima and had already requested them with great urgency. 

Slim was granted  30 Dakotas to fly the 5th Division from Arakan back on the 18th. By the 27th, the 9th and 123rd Indian Brigades had arrived at Imphal and the 161st Indian Brigade was being flown to Dimapur to reinforce Kohima. In addition, Slim was promised the 2nd British Division and the 23rd Long Range Penetration Brigade, should it be necessary. General Giffard also decided that once the airlift of the 5th Division was complete, the 7th Division would then be airlifted to Manipur. Yet that is all for the India-Burma front as we need to move over to New Britain.

On March 5th, Colonel Smith's 5th marines began loading for an overnight run to the Willaumez Peninsula, departing Iboki by nightfall. The following morning the small convoy assembled off Volupai, waiting for air support to soften up their landing area, but they never showed up. Apparently having reason to believe that the Marines would attempt to land at Beach Red, the defenders constructed an intricate communications net between Talasea and Volupai, placed some mines on the beach, constructed defenses of a sort, sighted in 90mm mortars–and then inexplicably did not attempt to defend the beach as they could have done very well under the circumstances. Realizing the longer they waited the better the enemy could prepare, Smith ordered the first assault wave to hit the beaches at 8:25. LCM-tank gunboats raked the beach with machine-gun fire, as Smith’s 1st Battalion successfully landed meeting enemy sniper and mortar fire. Some sniper fire was observed and 90mm mortar shells began splashing in the water, but Companies A and B drove on shoreward and within 10 minutes after crossing the line of departure about 500 Marines had landed. The two assault companies then pushed forward to establish a beachhead line through which the 2nd Battalion could pass and continue the attack in the direction of Bitokara Mission. Company A accomplished this with relatively little difficulty on the right, but on the left there existed a virtually impassable swamp, running north and south and extending to the edge of the Volupai track. As a result, Company B had to pass through a slot between Little Mt. Worri and the swamp in order to accomplish its mission, encountering and eliminating an enemy pocket of resistance before establishing its lines 200 yards inland. Meanwhile the reinforced platoon patrol that had gone after the bunker on Little Mt. Worri had run into difficulty. The retreating enemy joined other of their fellows and hastily manned defensive positions which had been prepared in the Volupai coconut grove. The platoon accounted for about a dozen of the Emperor's troops, losing one Marine killed and another wounded in the process. Finding he could not advance against the Japanese all-around defensive positions, the patrol leader requested assistance but was instructed to hold what he had until the 2nd Battalion arrived on the scene.

As the advancing elements pushed their way through the coconut trees, rear echelon personnel on Beach Red suffered heavier casualties than the assault units. All during the day the Japanese lobbed 90mm mortar shells onto the beach, shells landing capriciously and inevitably taking their toll in the crowded, constricted area. Among the early victims was Lieutenant Commander Richard M. Forsythe, regimental surgeon, who continued working with the wounded until he was evacuated. The heaviest casualties that day were recorded in the 11th Marines and among medical company personnel. Both groups had to remain on the beach, there being no other place to go. On top of that, coral reefs were delaying the LCM’s from fully landing the 3nd battalion until the early afternoon. Once Company E came ashore, the advance guard rapidly moved forward and began moving through the 1st Battalion's lines astride the Volupai Plantation track at 11:00. 

The Marines were brought to an abrupt halt 200 yards farther on where the Japanese had dug positions commanding the narrow trail. As Company E attempted to attack outside the plantation track, a medium tank commanded by Lieutenant John M. Scarborough moved up the trail to the company's assistance and knocked out a heavy machine-gun position. But suddenly two Japanese, one on each side of the trail and each armed with a magnetic mine, leaped out of the brush. The defending Marine infantry killed one before he could reach the tank, but the other succeeded in affixing the mine to the port side of the turret. The blast that followed killed the Japanese and the Marine who was trying to stop him, as well as jamming the turret so that it could not be operated and stunning the tank crew within. Simultaneously the rear of the turret was pierced by a missile, presumably an anti-tank grenade, which made a hole about three quarters of an inch in diameter.

Supported by two more tanks and mortars, Company E finally began moving towards the coconut grove with increasing momentum during the afternoon, at the same time capturing a detailed map of Japanese positions in the Talasea-Bitokara-Waru area. As night approached, elements of the 2nd Battalion set up an all-around defense within the coconut grove while the 1st Battalion manned the beachhead. By the end of the first day, the Marines had penetrated approximately 2000 yards inland from the beach and killed 35 Japanese while suffering 13 killed and 71 wounded, most of them to the deadly mortar fire.  More than half of these were incurred on the beach, and the figures for the day represented more than half the total casualties the combat team would suffer between March 6th and its departure on April 25th. 9 of the fatalities and 29 of the wounded were in the 11th Marines alone. 

At 2:00am on March 7th, a handful of Japanese attempted to infiltrate the lines of Company E, but the attack was so easily repelled that Smith considered that this wasn’t even a counterattack. Actually, realizing that his forces were heavily outnumbered, General Sakai had ordered the defenders to leave a rearguard of about 100 men and withdraw at once towards Bola. During the morning, the 2nd Battalion advanced through the abandoned enemy positions without facing any opposition until they were stopped on Mt. Schleuther’s northwest slope at 11:45. It became evident that the Japanese were attempting to turn the battalion's right flank. Luckily, Company F rushed forward and managed to extend the threatened flank and seize the high ground. At 3:00pm, the reserve 3rd Battalion was also landed at Volupai, thus relieving the 1st Battalion at the beachhead. The next morning, after a mortar barrage, the 2nd battalion soon discovered the Japanese had retreated past Bitokara. The Marines quickly captured Bitokara by 1:40pm. The Marines then dispatched scouts towards Mt. Schleuther and Talasea. The Mt. Schleuther scouting group reported that the Japanese were well dug in on a nearby peak, and at 3:00 a task force consisting of Company E and reinforcing elements began the ascent. A request for artillery fire on Scheuther brought several rounds dangerously close to the 2nd battalion, 5th Marines CP, and the battalion's 81mm mortars promptly took over the support missions. As the task force approached the enemy positions, however, it ran into concentrated fire from machine-guns and small arms, backed up by a 90mm mortar and a 75mm field piece. The Marines fought back for an hour and sustained 18 casualties before they were ordered withdrawn to the mission. The second scouting party had returned from Talasea, meanwhile, to report no indications of the enemy. 

 

As no enemy presence was found on the latter, Company F advanced to the airdrome and in less than an hour reported it secured.

Meanwhile the 1st Battalion advanced to Liapo and then began to push over rough terrain towards Waru, finally digging in for the night just a bit short of its objective. After some artillery and mortar dueling during the night, Companies G, B and C launched a coordinated assault at 8:00am on the 9th. Once again, they found abandoned positions, successfully clearing the Waru area by 1:00pm. Also a patrol was landed on Garua Island at 11:47, reporting it deserted as well.  By the afternoon, Smith moved his command post to Bitokara and informed the division that Talasea was secure and that his forces would now concentrate on mopping up and patrolling the Willaumez Peninsula. The 4 day campaign had cost the Marines 17 killed and 114 wounded, while estimating they had killed 150 Japanese. But now we need to jump over to Bougainville.

The Japanese had begun earlier in the year to improve some trails, particularly the net leading from the Mosigetta-Mawaraka area. A rough road had been completed through the jungle to the jump-off positions for the infantry. Nevertheless, the movement of over fifteen thousand troops with all their equipment proved to be a major task that would have dampened the spirits of all but the most ardent warriors. Artillery units had a particularly difficult time pulling their heavy guns through the jungle to get them into position to support the attack. Their task was made even more difficult by the daily downpour that flooded the streams, washing away many of the makeshift bridges and making some trails veritable seas of mud. American intelligence by mid-February was aware of the large-scale movement toward the perimeter and Allied planes repeatedly attacked the trails. Despite all these difficulties, the Japanese soldiers displaying their tenacity and ability to overcome the most difficult obstacles, brought up the supplies and eventually had all the guns in place for the attack.

All of this was done to support a major counteroffensive scheduled to begin on March 8th. On the 7th, the Iwasa unit has assembled behind Hill 1111; the Magata Unit behind Mount Nampei; the Muda Unit at Peko village on the East-West Trail, and the 17th Army Artillery Group, commanded by Colonel Saito Harumasa in place near Hill 600. Facing them, were the men of the 37th and Americal Divisions, who were on full alert in their foxholes and bunkers, waiting for the great Japanese counterattack. On the 8th General Hyakutake’s counterattack began with a heavy albeit uncoordinated artillery bombardment. The Japanese artillery concentrated its fire on Piva Yoke instead of the forward areas of the perimeter, which would be the main initial point of attack. The artillery fire was delivered spasmodically and with poor coordination despite the high vantage points from which the Japanese surveyed the central segment of the American positions.

The Japanese artillery did little damage. American corps and division artillery countered immediately, the 37th Division guns firing on the suspected hills to the northeast and the Americal howitzers concentrating on those to the east. The 6th Field Artillery Battalion and the 129th Infantry's cannon company were so situated that they could fire directly at the gun flashes. All other guns were directed by forward observers or spotter planes. Destroyers in Empress Augusta Bay also fired counterbattery missions. By midmorning marine dive and torpedo bombers were flying neutralization missions against Hills 250 and 600. Then in the afternoon 56 SBDs and 36 TBFs, guided by artillery smokeshells, struck the main concentrations on and around hill 1111. This all massively delayed the Japanese main assault. Only the 23rd Regiment would manage to assemble in place for the attack on Hill 700 by nightfall. Under drenching rainfall, the Japanese thus attacked the hill with some companies, yet their first assault was easily repelled by the experienced defenders. 

At 2:30General Iwasa launched his main assault, sending his 2nd and 3rd battalions, 23rd division against the saddle. Despite the heavy fire from the 145th Regiment, the Japanese stormed the hill en masse, screaming and screaming threats in English and even singing American songs, presumably in attempts to unnerve the defenders of the hill. According to the historian of the 145th  "The enemy stormed the hill, clawing his way up the steep slope, yelling like a maniac, suicidally putting everything he had into a frontal attack designed to take the highest point on the hill. ... The 145th Infantry, defending the ridge, were somewhat taken aback by an enemy so unreasoning as to crawl up the 70-degree slope on all fours, rifles slung over their backs." Suffering severe losses, Iwasa’s 2nd Battalion managed to blast their way through the protective wire and knock out one of the pillboxes. Through this gap, the Japanese moved onto the saddle and began to attack adjacent strongpoints, securing a penetration of the 145th's line 70 yards wide and 50 yards deep. Behind them, however, an effective artillery response would break up the attack of Iwasa’s 3rd Battalion; yet the 2nd Battalion would continue to expand this perimeter until, by 12:00, they had captured seven pillboxes and had brought up machine-guns and mortars with which they could put McClelland Road, the only lateral supply road for the 145th, under direct fire.

Supply of the forward troops became very difficult, since the three-quarter-ton trucks and half-tracks could not use the road. All supplies had to be hand carried. Evacuation of the wounded also became difficult and dangerous. Japanese machine guns on the crest of the hill were able to cover the ridge with accurate and deadly grazing fire. They had placed other machine guns in trees on the spur of the hill about a hundred yards to the rear of the ground-emplaced weapons, which could sweep the entire front. With the exception of a few scattered trees and shallow trenches, there was little cover for troops of the 145th who moved up the steep slopes attempting to retake the lost positions. All during the day the Japanese were also extending the trenches repairing the old pillboxes, and building new ones.

In response to this breakthrough, General Beightler sent the 1st Battalion, 145th Regiment to counterattack. By noon, the Americans were attacking the newly-gained Japanese positions, successfully retaking five of the lost pillboxes against heavy fire and establishing a new line just south of the crest by nightfall. The first attempt to recapture Hill 700 was launched at noon on the 9th. Company C moved northward against the saddle in a direct frontal assault while two platoons of Company F attacked the saddle from the flanks. Company C was halted by devastating fire two-thirds of the way to its objective, and the men were forced to dig in and hold what they had gained. Meanwhile the riflemen of Company F had retaken five of the lost pillboxes, and the line, now reinforced, was solidly established by nightfall just south of the crest. Beightler had ordered two tanks forward late in the afternoon to take enemy targets under direct fire, particularly those that menaced McClelland Road, but the terrain proved too steep for them to be used effectively. Thankfully, Iwasa’s breakthrough had been contained, with the 145th losing 23 killed and 128 wounded against an estimated 500 enemy dead. 

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Mutaguchi’s insane Operation U-Go was not going the way he thought it would. General Slim was outsmarting his enemy and it seems the allies were going to make further gains in Burma. Meanwhile things were heating up on Bougainville as Iwasa continued his grand offensive.