Last time we spoke about the invasion of Eniwetok and the end of Operation HA-GO in the Burma front. While Operation Hailstone was going on, the invasion of Eniwetok was greatly sped up as the Americans were simply too fast at conquering the Marshall islands. Codenamed operation Catchpole, Eniwetok was hit with the same kind of overwhelming force applied to Kwajalein and other islands. Aerial, naval and land base artillery smashed the defenders into submission before forces were landed. The Japanese launched so daring night time infiltration attacks, but were hopeless to stop the American seizure of the island. Within the Burma front the Japanese invaders were shocked at the performance of the newly improved Indian Army. Operation HA-GO was an utter disaster and worse it had weakened the Japanese to the point now the allies were going on the attack.

This episode is the invasion of the Admiralty Islands

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 for the South Pacific is reaching its climax. The allies are securing western New Britain, the Solomons and the Huon Peninsula. The Japanese are simply overwhelmed. The Japanese air forces have been utterly annihilated, their warships are being drained of fuel, are worn down by the war and are seemingly no longer ready for that decisive naval battle envisioned by Isoroku Yamamoto. The men are battle-weary, food is becoming more scarce, malnourishment is spreading. All those strung out at the furthest islands are basically being left to die. To end the misery for those in the South Pacific, the capture of the Admiralty Islands was one of the last steps in Operation Cartwheel and would seal off the Bismarck-Solomons area from supply and reinforcement, denying their use to the Japanese for effective air and naval operations, and left garrisons totaling over 100000 troops in isolated impotence

In the South Pacific, the Admiralty Islands, that of Manus and Los Negros stood at the northeastern exist of the Bismarck Sea. They commanded the important strategic point some 600 miles from Rabaul, 820 miles from Truk and 1370 miles from Mindanao Island. The joint chiefs believed Seeadler Harbor had the potential to become a major naval anchorage for the Pacific Fleet and perhaps the springboard for the invasion of the Philippines. Back on April 7th, 1942 a Japanese destroyer and a merchant ship had landed invading forces at Lorengau, driving off the hundred or so Europeans who had been living there. At that time the only airstrip was at Lorengau, the administrative center for the group of islands. Apparently the Admiralties were not considered significant in the offensive phase of the Japanese conquest of the South Pacific area, for it was not until February 1943, that construction forces started to build a 5000-foot airstrip at Momote Plantation on Los Negros and to put the 3000-foot Lorengau airfield into operational use. After October 1943, the Momote field and the smaller Lorengau strip served as ferrying stops on the replacement routes to Wewak, Hollandia, and Rabaul, until Allied air attacks destroyed the effectiveness of the Admiralties' base. Seeadler Harbor was also being used for surface craft and possibly for seaplanes.

In late 1943, General MacArthur had assigned General Krueger’s Alamo Force at that time based in Finschhafen to plan the seizure of the Seeadler Harbor area, with the aim of establishing an airdrome and light naval facilities for the support of subsequent operations along the north coast of New Guinea.  On February 13th however, MacArthur ordered Krueger to seize all of the Admiralty islands and to build air bases at Lorengau and Momote. This was to be Operation Brewer, beginning on April 1st. However one of Lt General Kenney’s spotter planes noticed there was no sign of life on the Admiralty Islands and this prompted MacArthur to move up the time table, to the end of February. It would be quite a mistake. MacArthur’s chief of intelligence, Colonel Willoughby, was convinced Kenney’s intelligence was incorrect and information from ULTRA intercepts seemed to support his claims. It seemed Kenney had been fooled. The Japanese appeared to be absent on the islands, because Colonel Yoshio Ezaki had ordered his men not to move during the day, so as to conceal their work constructing two new airstrips and to conserve anti-aircraft ammunition. In spite of Kenney’s arguments that the Japanese looked vulnerable, MacArthur’s staff officers were not at all happy at the idea of taking such a high level risk assaulting them. Even Kenney would note “we had already outrun the capabilities of our supply system.” Ignoring the limitations, MacArthur was determined to take the islands, but would later reminisce “I felt that the situation presented an ideal opportunity for a coup de main which, if successful, could advance the Allied timetable in the Pacific by several months and save thousands of Allied lives.”

This of course is MacArthur we are talking about and the capture of the Admiralty Islands would advance his timetable to retake the Philippines, so for him it was a no brainer. There was also the on going race. MacArthur was obviously taking notice of Admiral Nimitz’s thrust into the Central Pacific, and what a thrust it was. The Gilberts and Marshalls were falling in extremely surprising speed. MacArthur, fully aware of the risks of forwarding Operation Brewer, nevertheless did so and would cover his tracks by describing the invasion as “a reconnaissance in force” The misgivings of this decision would be apparent when a covert reconnaissance mission led by Lt J.R McGowan and 5 other men of the 158th infantry reported on February 27th that the island were “lousy with Japs”, but by that point it was too late to pull back.

For the operation, Krueger would assign Major-General Innis Swift’s 1st Cavalry Division, which was training intensively in the Oro Bay area. Although the 1st Cavalry Division was dismounted for operations in the Pacific, it retained its organization as a cavalry unit with two brigades, each made up of two reinforced regiments. In addition to supporting units, each regiment comprised two squadrons of three rille troops and a heavy weapons troop. Air offensives against Rabaul and Wewak continued throughout February, seeing an enormous reduction in the Japanese ability for air action. On the 22nd and 23rd, Captain Burke’s Destroyer Squadron 23, consisting of Destroyers Charles Ausburne, Stanly, Converse, Spence and Dyson made a daring sweep in the Admiralty island area. They managed to sink the 3800 ton Japanese tug Nagaura due east of Lorengau. 3 of his destroyers then sailed south of New Hanover where they sank a IJN minelayer and a cargo ship before turning around the coast of New Ireland. They encountered no shipping there, so they fired 1500 five-inch shells into Duke of York Island in order to damage the airfield under construction. Meanwhile the other 2 destroyers sailed north of New Hanover and bombarded the enemy base at Kavieng.

At this point MacArthur realized the Japanese could not mount any significant air or naval support to defend the admiralties. He also believed Los Negros islands was lightly held and that they was a “coup de main” opportunity. As someone who speaks french as a second language, I gotta say its so weird how we anglophones use these random french phrases for things haha. Thus MacArthur decided to change his plans somewhat. In place of the scheduled assault set for April 1st, he now was tossing the “reconnaissance in force” I mentioned early against the Momote airstrip on Hyane Harbor and that it should be carried out no later than February 29th. The force performing this was to be known as the Brewer Reconnaissance Force; it consisted of 3 rifle troops and the heavy weapons troop of the 2nd Squadron, 5th Cavalry Regiment: 800 men with their complement of light and heavy machine guns, rocket launchers, and mortars. With them was a platoon from Battery B, 99th Field Artillery Battalion, carrying two 75-mm pack howitzers, four 50-caliber machine guns, and small arms. The 673rd Antiaircraft Machine Gun Battery, a unit of some 80 men, was equipped with twelve 50-caliber machine guns as well as individual weapons. Air and naval liaison officers and a shore fire control party were scheduled to land with the attacking force; Headquarters Troop, 1st Cavalry Brigade, would furnish a reconnaissance and a communications platoon. Arrangements had also been made for a detachment from the Australian New Guinea Administration Unit, usually called ANGAU; this group was to assist chiefly in gathering intelligence, patrolling, recruiting, and dealing with the native population as their villages were liberated.

If these men found Momote to be adequately defended, then they would establish a perimeter and await reinforcements, thus the reconnaissance turns into an invasion.With just 5 days to plan, General Kenney’s 5th air force was given the task of bombing the objective area and northern Ireland. Meanwhile Admiral Barbey’s destroyers were going to perform a heavy bombardment to cover the approach and landings. A patrol from the Alamo Scouts landed on the southeastern coast of Los Negros from a Catalina flying boat on the night of February 27th. They performed a reconnaissance, quickly discovering Colonel Ezaki Yoshio’s forces were present. Yoshio’s HQ was at Papitalai, the bulk of troops at Lorengau with garrison units were on Rambutyo, Peli, Pak, and Pityilu Islands and at the inland village of Kawaliap. One battalion was also at Papitalai covering HQ. The 2nd Battalion, 1st Independent Mixed Regiment at Salami and 1st Battalion, 229th Regiment at Hyane Harbor with its main elements south of Momote. It was obvious the enemy was still present in force. The Scouts discovered a large bivouac area on the southeast part of Los Negros and reported that the region between the Momote air strip and the south coast was as I mentioned earlier "lousy with Japs." This further allowed Admiral Barbey to make more specific bombardment plans.

Three fire support areas had been established for the attack group, consisting of nine destroyers and the three destroyer-transports which were carrying the reconnaissance force. These areas covered the entire seaward side of Los Negros from the south coast to the northern end of Salami Plantation. In the final plans the attack group would bring the weight of its firepower against targets around Hyane Harbor and to the north. Additional fire to cover the southern part of the island would be furnished by another task group of two cruisers and four destroyers, which would meet the convoy at Cape Cretin. It was decided to split this latter group, giving one cruiser and two destroyers responsibility for the Japanese bivouac area, southwest of the Momote strip, which the Alamo Scouts had located. The other cruiser and two destroyers would fire on targets in the Lorengau-Seeadler Harbor region. In the 15-minute bombardment, scheduled from H-35 to H-20, 5-inch naval guns were each to expend approximately 350 rounds. Under the air force plan, two groups of heavy bombers would attack ground targets on Los Negros from H-28 to H-20. Two minutes later, four groups of medium bombers were to bomb and strafe the landing area until the first wave was ashore. Following H Hour a squadron of medium bombers and six smoke planes were to be on air alert for further missions.

The Japanese did not anticipate a landing would be made at Momote, thus only a few elements of the 1st battalion, 229th regiment were there while the bulk of their forces were concentrated at the beaches of Seeadler Harbor and on the other side of the island. Now despite the Alamo scouts best efforts, there was quite a lot of unknown variables. In light of that the landings would be done simplistically. 3 waves of 12 LCPRS would carry the troops to White Beach, lying near Jamandilai Point. From there the reconnaissance force led by Brigadier-General William Chase would advance and hold Momote airstrip. If this proved too difficult, the men would be loaded back up and return to Oro Bay. Now in the event of a successful landing, the remainder of the 5th cavalry regiment would come over 2 days later and the rest of the cavalry division, the main body of the Brewer force, would follow the reconnaissance and support forces as soon as shipping could be made available.

On February 27, the 2nd Squadron, 5th Cavalry led by Lt. Colonel William E. Lobit loaded up at Oro Bay, and the following morning departed aboard 3 APDs and nine destroyers under the command of Rear-Admiral William Fechteler. They would rendezvous with Admiral Kinkaid’s light cruisers at 13:26, around Cape Cretin, with General MacArthur onboard, and finally would arrive at a point about 10 miles south of Los Negros at 6:00 on February 29. While the troops climbed aboard their LCPRs, Fechteler’s destroyers opened fire on their assigned targets. Unfortunately, when the LCPRs reached the line of departure, about 3700 yards from the beaches, the defenders responded with heavy machine-gun and battery fire.At H-28 minutes enemy machine-gun fire opened on the boats, whom began maneuvering radically as they could. Machine-gun fire was also directed against the destroyers and the Phoenix group to the south. Heavier shore batteries opened up; flashes could be seen from d gun near Southeast Point on the island, and what appeared to be 3- or 4-inch shells landed in the vicinity of the Flusser and the Mahan. In response the Phoenix and Mahan fired upon the batteries and 9 B-25’s strafed and bombed the area. Their participation was limited by a heavy overcast and a low ceiling. Of the 40 B-24s scheduled to arrive during the naval bombardment, only 3 appeared before their appointed time to bomb the target area at H-47 minutes. The planned missions of four groups of B-25s fared little better, only nine appearing and these later than scheduled. No communications had been established with the B-25s nor could any of the planes be seen from the flagship, so the plan was called off for stopping naval gunfire at H-20 minutes to permit low-level bombing and strafing. The naval bombardment was continued for another 15 minutes. The order to cease fire was given at H-5 minutes and, although no aircraft were visible, starshells were fired as the attack signal for any strafers that might be in the vicinity.

The first wave of LCPRs reached the shore at 8:17, meeting slight enemy fire. Troop G led by 1st-Lieutenant Marvin Henshaw rushed beyond the narrow beach to the edge of a coconut plantation, taking cover under fallen trees and kunai grass. Here they laid prone, forming a rough half-circle with a 50-yard radius. They saw scattered groups of the enemy fleeing inland, some as far away as the other side of the air strip. Lieutenant Henshaw killed one with a long distance shot, and members of his platoon killed another. Not one of the soldiers who landed in the first wave was a casualty. As the bombardment lifted, the defenders gradually came out of their dugouts and began subjecting the returning boats to cross-fire. As the second wave approached, the enemy fire became so heavy, the LCPR’s were forced to turn back so the Mahan, Flusser and Drayton could further bombard them. At 08:23, the second wave finally landed, moving swiftly past the troops of the first wave to a point 100 yards inland. 22 minutes later, the third wave landed, rapidly fanning south and establishing a line 300 yards inland by 09:00. Meeting slight opposition, the cavalrymen managed to secure the Momote airstrip by 9:50 and completely unloaded by 12:50.

4 of the LCPRs had been left out of action during the landings, so the reconnaissance force could not be evacuated. From the positions held by the first waves, the troops then gradually moved forward to cover the whole dispersal area of the airdrome, sending patrols beyond the airdrome which identified evidence of concerning recent Japanese activity. As patrols sent out beyond the airdrome began to report back, the commanders could decide the next move. One patrol had scouted 1,000 yards west to Porlaka without contact, and another almost as far north as the skidway before meeting any enemy, there was plenty of evidence that the Japanese had recently been in the vicinity in some strength. One patrol that went about a mile south found the hastily vacated quarters of a high-ranking officer, as well as a bivouac area, and fired at a fleeing Japanese officer. Another found three big kitchens and a warehouse of food. Although the Japanese in the area had offered negligible resistance, our command expected a change in the near future. Captured documents revealed that 200 antiaircraft personnel had been encamped nearby.

Given this information, General Chase decided to pull back to a perimeter due east of the airstrip and had the cavalrymen dig in for the night. During the afternoon the reconnaissance force organized its defenses, which presented many difficulties. A good foxhole required back-breaking efforts, because the soil was heavy with coral. Since there was no barbed wire to put around the beachhead, men and weapons had to be spaced closely and every man available used for the perimeter defense. The 40 field artillery officers and men were assigned sectors for close-in defense, because their two pack howitzers could not cover the critical space in front of the defense line from such a shallow depth as the perimeter allowed. They took over these sectors after the howitzers had blasted away for a while at the Japanese known to be in the skidway area. For heavy weapons support, the twelve 50-caliber machine guns of the antiaircraft unit were moved into positions along the front line. Signalmen strung the perimeter with wire to make the necessary hook-ups for officers in the chain of command, and removed the radio sets for communication with Sixth Army Headquarters from an advanced position to a more sheltered bomb crater. Outposts were stationed beyond the strip on the far edges of the dispersal area. Meanwhile, MacArthur came ashore during the afternoon and decorated the first man to land, Lieutenant Henshaw, with a Distinguished Service Cross. He decided to stay, ordering Chase to hold his position until the follow-up force arrived. MacArthur then returned to the Phoenix, which got underway shortly afterwards at 5:29 for Cape Sudest, taking with it all the ships except two destroyers.

On the Japanese side, Colonel Ezaki immediately ordered the 1st Battalion, 229th Regiment to attack the beachhead during the night and annihilate the enemy or die trying. Suspicions that the Momote landing was a diversion, however, would prevent him from sending the rest of his troops to assist. Colonel Ezaki issued the following orders to the infantry battalion defending the Hyane Harbor sector: “Tonight the battalion under Captain Baba will annihilate the enemy who have landed. This is not a delaying action. Be resolute to sacrifice your life for the Emperor and commit suicide in case capture is imminent. We must carry out our mission with the present strength and annihilate the enemy on the spot. I am highly indignant about the enemy's arrogant attitude. Remember to kill or capture all ranking enemy officers for our intelligence purposes…”

As ordered, 200 men with 3 mortars; 2 platoons of the 229th Infantry and 1 platoon of crept up to the Americans during the night. Yet by the time they reached the American line, their movement was no longer coordinated and they could only achieve some minor infiltrations. Groups of 7 to 15 Japanese edging in, flinging grenades at the weapons that fired. The only way the Japanese could be seen was by the light of grenade explosions or when the attackers got close enough so that a cavalryman crouched in a fox hole could see them silhouetted against the sky. Many of the Japanese were cut down by machine-gun and rifle fire, but some got through and succeeded in cutting all telephone lines. Although infiltrations occurred on all edges of the perimeter, the attack was heaviest near the shore on the southern side. Here some Japanese reached the shore in the rear of the main defense line by swimming in from the sea with life preservers. The vegetation bordering the beach provided protection for these infiltrators. One group found an opening in the left flank of Troop E, holding the south sector, next to the field artillery unit that held along the shore. The enemy penetrated Troop E's defense line, entirely isolating the 3d Platoon. Without communication with its troop, the unit had to fight it out alone against very heavy attacks.

Come daylight, the majority of the Japanese survivors had disappeared back into the jungle, leaving 66 dead against 7 Americans killed and 15 wounded. However, those who had infiltrated and reoccupied some of their former pillboxes and fortifications in the perimeter had to be cleared out by the tired cavalrymen.

During the afternoon, patrols were also sent west and north to check how much strength the enemy had and the perimeter was further contracted and tightened. At 5:00, 2 companies of the 229th regiment made another coordinated effort against the perimeter, yet its intensity was lowered by the death of the battalion commander. The afternoon was free from enemy activity except for a patrol which was discovered inside the perimeter at about 4:00. The patrol's mission was evidently to kill or capture the American commanding officer. It was led by Captain Baba, the commander of the battalion who made the major attack on the preceding night. Although operating in broad daylight, the patrol came close to succeeding. The Americans were confident that the morning's mop-up had taken care of all the enemy within the perimeter. Secondary growth was thick in the area and the Japanese were unnoticed until they were within 35 yards of the task force command post. Once the group was sighted, a considerable amount of fire was placed on it. The Japanese lay concealed in the undergrowth and a single sniper pecked away with his rifle in the direction of the CP. Not knowing the size of the party, Major Chiaramonte set out with four men "to get the sniper." The task force commander and his executive officer directed the movement of the group either right or left according to movements in the underbrush, and the soldiers and Major Chiaramonte opened up whenever they detected any movements. As Major Chiaramonte and his party finally entered the area on which they had been firing, they heard a click followed by grenade explosions. Three of the Japanese had committed suicide. Another rolled over on his back and used his sword to commit hara-kiri. Fifteen dead officers and sergeants were counted, including Captain Baba. Thus, the attackers were kept beyond the perimeter until nightfall, when the attack finally stopped.

On March 2, after clearing Jamandilai Point by 10:45, 6 LSTs landed the 1st Squadron, 5th Cavalry plus artillery and Seabees. While the troops landed, Captain Emile Dechaineux’s and will be honest very curious how Americans would pronounce that one, like i’ve said before there is no rhyme or reason as to how Americans pronounce french last names haha, well Dechaineux’s destroyers bombarded Hauwei Island and Hyane Harbor. With reinforcements in hand, General Chase launched a new attack to extend his perimeter. At 2:15 B-25's, P- 38's, and P-47's bombed and strafed the area. The western half of the airfield and the dispersal area were softened up for the ground attack, and the skidway and Hyane coast beyond were also targets. Bombs were also dropped on the strip of land forming the northern arm of the harbor. After this at 3:00 the two cavalry squadrons advanced across the airstrip, rapidly taking the entire aerodrome against light opposition and finally digging along a new perimeter.

To block possible enemy landings from across Hyane Harbor, two anti-aircraft batteries and E Company of the 592nd Boat and Shore Regiment defended the shore. Seabees formed an inner defense line to the west and northwest of the brigade. Six rough trenches were dug out by a bulldozer and ten men stationed in each. The remainder of the 40th Construction Battalion elements remained in their trench on the right flank, which was now a secondary line behind the troopers. The critical north and northwest sectors were the 2nd Squadron's responsibility. They prepared their positions with careful attention to interlocking bands of machine-gun fire, while the 1st Squadron dug in on the left flank. The first night in the enlarged beachhead passed by without a crisis. An attack came at 9:00pm, but it was not as severe as expected. The chief enemy effort was to push machine-gun parties and infiltration groups through the 2nd Squadron's sector, and in particular through that held by Troop G. Communication lines were cut, radio equipment was slightly damaged, and a few Japanese penetrated as far as the field artillery positions. The artillery, prepared for interdiction fire, was not called on.

The following morning, a systematic search for enemy troops within the position was started and all Japanese within the perimeter were killed while the Seabees began work on the airstrip. At the same time, Krueger arranged with Barbey to expedite the movement of the rest of the cavalry division. The 2nd Squadron, 7th Cavalry Regiment was to arrive on March 4; the remaining units of the 1st Brigade would arrive by March 6; and the 2nd Brigade was to arrive on March 9. At this point Colonel Ezaki realized his situation was desperate, his 1st battalion, 229th regiment was being obliterated. He moved his HQ from Papitalai to Papitalai Mission and began concentrating his garrison units at Lorengau. He also ordered the 2nd battalion ,1st independent regiment at Salami to perform an assault from the north, coordinating with the 229th regiment. Their advance was slowed by constant naval and land artillery fire, but they got into position by the night of March 3rd. The Americans expected the attack, as prior, an enemy officer patrol had attempted to land on the shore of Hyane Harbor. The platoon leader of the shore company guarding the beach there allowed the boat to come in to land, then opened fire, killing all members of the patrol. Among the valuable documents discovered on the bodies was one which gave the information that a strong attack would be launched that night.

With this knowledge, the Americans fortified their front line defenses. Since infiltration was still the greatest danger for a small force holding a large perimeter in jungle and darkness, the front line positions were of prime importance. To offer as little space as possible for infiltration, each troop in the line would use all three of its rifle platoons. Automatic weapons covering front-line positions were basic in the fire plans; each of these weapons, in turn, was protected by two, three, or four dugouts on both flanks and rear manned by two or three riflemen. The approaches to these positions were strewn with mines, and trip signals were made of empty "C"-ration cans with lumps of coral inside for clappers, and hung on lengths of wire strung taut ten inches off the ground. In organizing defenses, good use was made of Japanese revetments, built to protect their airplanes in the dispersal bays on the airstrip. These revetments were steep banks of earth reaching some 15 feet high; usually a large one was at the end of a bay with two smaller embankments flanking it to form a pattern which, from the air, looked like cleats on the sole of a football shoe. Near the crest of some of these mounds, on the reverse slopes, cavalrymen dug foxholes. Two 30-caliber water-cooled machine guns were then placed on the flat ground alongside the bunker and mounted to fire across the front of the position.

All the 81-mm mortars were massed near the center of the perimeter, while all the 60-mm mortars were moved close to the front line. The water-cooled 50-caliber machine guns of the antiaircraft were returned to their units, except for those on the northern end of the air strip. This side of the perimeter faced the skidway, whence the chief attack was expected. Patrols had met the greatest opposition when working in this direction and toward Porlaka; enemy barges and troop concentrations had also been sighted on the northwestern shore of Hyane Harbor.  Nearby naval units would also coordinate by firing upon any Japanese concentration discovered. At 9pm the Japanese began their attack as a single Japanese bomber dropped 8 bombs.

As soon as the plane had departed, two yellow flares went up from the vicinity of Podaka, and a tracer, apparently 20-mm, was fired almost vertically from a position in front of the Troop B sector to the southwest. Almost immediately an attack supported by mortar fire was launched there as well as against the position held by Troops F and G to the northwest. The attack against the 1st Squadron on the southwest was relatively light, the enemy strength here being estimated later at two reinforced platoons. Since the 1st Squadron's sector was covered by a heavy growth of secondary jungle forest, infiltration was a great danger. The sited positions of our automatic weapons were of little value in the darkness, so the cavalrymen picked up the guns and fired them from the hip. The Japanese moved automatic weapons forward apparently with no other plan of action than to set them up in the open in front of our lines, depending on darkness to conceal their positions. The excited talking of the crews gave their positions away and they became easy targets for the defending riflemen. The attackers were blanketed by mortar fire accurately placed 20 to 50 yards in front of the perimeter. Nevertheless, many of the enemy did infiltrate, some as far as the south end of the air strip where they hid in heavy brush or climbed trees to begin sniper operations at dawn. Because of the relative weakness of the attacking force, there was never any real danger that the 1st Squadron's positions would be overrun.

The attack upon the 2nd Squadron's position on the northwest was a greater threat, with over a battalion, as later estimated, advancing on this sector from the direction of Pori aka and the skidway against the whole of Troop G's position and the right flank of Troop F. Apparently the enemy's intention was to drive our troops from their perimeter and occupy the north end of the air strip. The attacks against the sector held by Troops E and F were limited to infiltrations toward mortar positions and command posts. The rear installations were covered hy enemy mortar fire and machinegun fire while Japanese with grenades closed in on them and overran the positions. The Seabees, holding their secondary defense line behind the cavalry on the north side of the perimeter, also felt the effects of the furious attacks. Cavalrymen whose guns were knocked out, or who had run out of ammunition, carne back to the Seabees' trenches. When a weak place developed toward the left side of the Seabees' positions, their extra ammunition was at the other end of their line. First the men passed the ammunition to the front line by throwing the boxes from hole to hole, but when that seemed too slow they got out of their holes and ran with it, holding it low.

The Japanese advanced relentlessly, talking and singing though damaged and hampered by antipersonnel mines and booby traps, until they were cut down by the fierce machine-gun fire of the cavalrymen. Yet more and more kept coming behind them, marching over the bodies of the first. The Americans hunkered down in their holes and fired upon anything that moved,  continuing to inflict heavy casualties. The Japanese attempted a number of tricks and were occasionally successful. Somehow they learnt the names of platoon leaders. On one occasion a Japanese yelled, "Retreat, Thorne, the whole regiment's falling back to another line." This caused the mortar platoon commanded by 1st Lt. William D. Thorne to leave their positions. Not only did the platoon suffer three casualties, but it was unable to direct its mortar fire during the rest of the night. Another trick was to have individuals move about in front of the perimeter to draw the fire of machine guns. Then two or three snipers would fire tracers at any weapon that disclosed itself, enabling a mortar to open up on the position. Several cases of wiretapping of a 90-mm anti-aircraft battery took place between 10:30 and midnight, the wire-tapper claiming to be, on one occasion, a certain officer commanding a platoon, and on another, a sergeant. He reported in each case the disruption of our plans and the success of the enemy. Since his voice was not recognized, his messages were not heeded. However, a later message, although believed false, made the 211th Coast Artillery (AA) Battalion change its CP. At 11:30 a single enemy plane with landing lights on made several runs at a low altitude dropping flares. In spite of orders to hold their fire, the anti-aircraft battery opened up on the fourth run and drove the plane to the north, where it dropped bombs on Japanese positions.

Japanese using knives and grenades managed to get themselves into Troop G's defenses. A ferocious counterattack by the cavalrymen would shortly regain the positions just in time to face another strong frontal attack, in which more Japanese were cut down in front of the 2nd Squadron. By daylight, the infantry attacks were finally over, with the cavalrymen counting over 750 Japanese dead as they established a new outpost line on March 4. Against them, the Americans lost 61 killed and 244 wounded, 9 of the dead and 38 of the wounded were Seabees. That same day was met with another heavy bombardment of the Japanese positions, then the 2nd Squadron, 7th Cavalry landed against slight enemy resistance. The defensive perimeter was strengthened again and the damage of the previous night was repaired.

Colonel Ezaki now believed that his troops had successfully pierced the American first line of defense and thus ordered to continue the attack that night; but upon learning the truth and how many casualties he had suffered, he decided to cancel the attack and ordered a general withdrawal towards Lorengau, leaving some units to hold Papitalai and delay the American advance. 600  men had been lost in the skidway area and in the attacks upon the perimeter. The remaining 200, with an additional 100 stragglers from other disorganized units, were ordered to retreat through Salami Beach and across Papitalai Harbor to Papitalai Mission. Natives on Mokerang Peninsula later told the Angau Party that the Japanese retreat developed into a rout. They were panic-stricken; some did not even wait to take paddles for the native canoes that they had appropriated for their escape to Papitalai Mission. Not more than 80 Japanese, frantic from fear and exhaustion, arrived at the mission to bolster the force already there.

By the 5th, General Swift arrived to the secured  beachhead in the Admiralties, and with the arrival of the 12th Cavalry Regiment the following day, he was now ready to launch an offensive west towards Seeadler Harbor, the Lorengau airdrome and north against Salami Plantation. The same day, to clear the way for the 2nd Brigade’s landing at Red Beach, General Swift ordered the 2nd Squadron, 7th Cavalry to move across the skidway to a point about 500 yards north. Despite a thorough artillery support, the advance did not go smoothly, with the Japanese immediately launching a strong attack from both Porlaka and the native skidway. Luckily the few Japanese who penetrated the position were killed, around 25 of them and the attack was broken up by mortar and artillery fire. At 4:30, the squadron finally began their offensive, moving with difficulty across a mined area and only gaining about 500 yards by nightfall.

The next morning, the squadron advanced, with the 12th Cavalry soon joining them. Despite the occasional pillboxes and the congested trail, the cavalrymen made ample progress towards the beaches of Seeadler Harbor and closed in on Salami by 4:30. To further secure the harbor, General Swift planned to clear the enemy presence at the Mokerang Peninsula, Papitalai Mission and Lombrum Point. That day, the 5th Cavalry had already begun the work of clearing the southern shore of Seeadler Harbor by pushing patrols west from the airstrip. Finding much more enemy corpses that opposition, Troop F would be able to establish a bridgehead at Porlaka. At 12:00 on the 7th, after an artillery bombardment, a reconnaissance patrol consisting of 40 volunteers from Troop B, led by Capt. William C. Cornelius advanced across Lemondrol Creek and successfully landed on Papitalai against an estimated 50 Japanese defenders. Captain Cornelius, leading the first wave, was reported to have single-handedly killed four of the enemy with rifle fire and grenades while operating 50 yards in advance of the troops. Yet severely wounded, he would die the next day; for his courage and leadership he was awarded the Distinguished Service Cross.  The Japanese quickly withdrew. Simultaneously after a heavy air and artillery bombardment, the 2nd Squadron, 12th Cavalry departed Salami and advanced across Seeadler Harbor to land on Papitalai Mission, meeting heavy resistance.

By nightfall, Troop G had secured a beachhead, though it would have to break up three determined counterattacks during the night. This ultimately forced the Japanese to pull out from their beach defenses at Papitalai Mission and retreat towards Lorengau, allowing the cavalrymen to secure the beachhead the following morning. By 12:00 on the 8th, supplies for the 2nd Squadron, 7th Cavalry's attack on Lombrum Plantation also began arriving at Red Beach over the difficult road from Momote. Equipping the 12th Cavalry and the 2nd Squadron, 7th Cavalry, at Salami with enough supplies to carry on their overwater attacks was a difficult and hazardous operation. The single road from Momote to Salami was impassable for most vehicles during the days when the supplies were most urgently needed. Buffaloes got through by going overwater part of the way, but the rest of the essential supplies had to be dropped from airplanes or sent in LCMs from Momote around Mokerang Peninsula. The sending of LCMs into Seeadler Harbor was an operation which was possible only after continued naval efforts from D-Day on. Magnetic mines, dropped by American planes in May 1943, were presumably still in the harbor and had to be removed. To make entry into the harbor safe for their forces, destroyers also had to neutralize the Japanese harbor defense guns, which had already proved effective. The destroyers and