World War II Database

Contributor: C. Peter Chen

ww2dbaseJapanese Decision to Abandon New Guinea Island
30 Sep 1943

ww2dbaseOn 30 Sep 1943, the Imperial General Headquarters in Tokyo, Japan endorsed a plan to reduce Japan's defense perimeter, a plan which was drawn up 15 days before. This new defense perimeter went from Burma through Dutch New Guinea, the Caroline Islands, and finally to the Marshall Islands. Although it was a serious effort to consolidate conquests and to shorten supply lines, this plan meant the abandonment of 300,000 troops outside of the perimeter, who were unable to be evacuated easily due to Allied air superiority. At this time, 120,000 Japanese personnel were located in eastern New Guinea island, many groups of which were running out of food and supplies. First Lieutenant Toshiro Kuroki commanded the Third Company of the 20th Engineer Regiment attached to the 20th Division, stationed in New Guinea at the time. He recalled the rice supplies running thin as days wore on:

ww2dbaseWith the Japanese troops stranded, Allied troops began their slow movement across this second largest island in the world.

ww2dbaseCarrier Raids on Rabaul
5 and 11 Nov 1943

ww2dbaseRabaul on the island of New Britain, which was administratively part of Australian New Guinea, was the stronghold of Japanese defense in the region. The base featured multiple airfields (with a large aircraft maintenance staff) and an excellent anchorage ("The Pearl Harbor of the South Pacific"). For some time, Rabaul had already been subjected to aerial attacks by US Army Air Forces long range bombers based in Port Moresby, Australian Papua, but in early Nov, the Americans stepped up the effort by launching carrier strikes, with the goal of pinning down Japanese naval and air forces to prevent their interference of the invasion of Bougainville in the nearby Solomon Islands (see Solomon Islands Campaign). On 5 Nov, US Task Force 38 under Rear Admiral Frederick Sherman, with carriers USS Saratoga and USS Princeton, launched a total of 97 aircraft (33 F6F, 16 TBF, and 22 SBD aircraft from USS Saratoga; 19 F6F and 7 TBF aircraft from USS Princeton) against Rabaul. The dive bombers caught the Japanese Cruiser Division 4 by surprise, damaging several cruisers and destroyers; the torpedo bombers, however, were generally ineffective. At the cost of only 9 aircraft and 14 lives, the Americans achieved the short term goal of preventing Japanese forces from reaching the American ships off Bougainville, the medium term goal of putting several major Japanese warships out of action, and the long term goal of starting the final step in the process to isolate and then neutralize Rabaul.

ww2dbaseOn 11 Nov, a follow-up raid was conducted, this time with the addition of USS Bunker Hill, USS Essex, and USS Independence, launching a total of 276 aircraft (36 F6F-3, 23 SBD-5, and 19 TBF-1 from USS Saratoga; 20 F6F and 9 TBF from USS Princeton; 27 F6F, 19 TBF, and 23 SB2C from Bunker Hill; 29 F6F, 28 SBD, and 18 TBF from USS Essex; 16 F6F and 9 TBF from USS Independence). The carrier strike was joined by 23 land-based F4U-1 fighters and several land-based F6F fighters, and it was preceded by a bombing run by 23 B-24 bombers of US Army Air Forces 43rd Bomb Group on the Lakunai Airfield. The US Navy aircraft successfully sank one destroyer (Suzunami; 148 killed including commanding officer Captain Masao Kamiyama) and damaged several other destroyers and destroyed 11 Japanese aircraft, at the cost of only 9 US aircraft (although an additional 7 aircraft would later be written off due to extensive battle damage). In addition to losses in equipment and lives, the Japanese garrison at Rabaul would also suffer a blow to its morale after this second major raid within days, after a long series of bombings by land-based USAAF bombers.

ww2dbaseIn an attempt to avenge the morning strike, the Japanese mounted a counterattack in the afternoon. At 1410 hours on 11 Nov 1943, D3A, 14 B5N, 4 D4Y, and 33 A6M aircraft (32 Japanese Army fighters were also launched but they lost their way) attacked the US carrier fleet. The attack would prove to be a disaster for the Japanese. For the 33 aircraft lost (and the loss of famed pilot Lieutenant Masao Sato), they failed to sink any American carriers and had only destroyed 2 F4U, 2 F6F, 1 TBF, and 1 SB2C aircraft.

ww2dbaseLandings on New Britain
15 Dec 1943-22 Apr 1944

ww2dbaseOn 15 Dec 1943, American 112th Cavalry Regiment landed at Arawe on the southwestern coast of New Britain. This move was aimed to disrupt Japanese supply lines. On 26 Dec 1943, Major General William H. Rupertus' US 1st Marine Division landed at nearby Cape Gloucester. Major General Iwao Matsuda's Japanese 17th Division opposed the American landings.

ww2dbaseIn hindsight, the nearly concurrent Bougainville operation, which would ultimately end in a US victory, would achieve the goal of isolating Rabaul, thus making the landings at Arawe and Cape Gloucester unnecessary. Nevertheless, the presence of Americans in southern New Britain guaranteed the isolation effort.

ww2dbaseAdmiralty Islands
26 Feb-25 Mar 1944

ww2dbaseThe Admiralty Islands were on the US target list also for cutting off Rabaul. Additionally, gaining the Admiralty Islands would secure the right flank of the Allied advance across the northern coast of New Guinea island. Intelligence photographs given to Douglas MacArthur showed airfields that appear abandoned, confusing his staff the actual number of defenders there; it was the tactic of Colonel Yoshio Ezaki, who wished to remain mysterious and keep his enemies guessing on his strength. All Ezaki's men were hidden in the jungles, ordered not to fire at enemy aircraft. US Army Air Forces thought the island was only held by a small number of Japanese troops, while the Army thought Ezaki's strength was somewhere between 4,000 and 5,000. Ezaki's actual strength was about 4,450.

ww2dbaseOn 29 Feb 1944, Vice Admiral Thomas Kinkaid's ship provided transport for part of Brigadier General William Chase's First Cavalry Division, about 1,000 dismounted men, to Los Negros. Unlike typical amphibious assaults, the landing force was small, largely due to the lack of intelligence on Japanese strength. They were ordered to secure the nearby airfield, and either fall back if the airfield if it was heavily defended or hold the airfield if only moderately defended; in both cases, they would be reinforced later. The landing was conducted with surprise, and the airfield was taken relatively easily by the 2nd Squadron of the 5th Cavalry Regiment. They set up a defensive line near the coast so that any attacking Japanese would need to dash across the open airfield with little cover. Repeated Japanese counterattacks, all in the form of small night attacks during the next few nights, instilled fear with American soldiers, but all of the attacks were fought off. The support force finally arrived on 4 Feb, followed by the arrival of the 12th Cavalry Regiment on 6 Mar and the 2nd Cavalry Brigade on 9 Mar. The 2nd Cavalry Brigade secured the small adjacent islands over the following few days, including the landing on Manus on 15 Mar to occupy the Japanese airfield on that island.

ww2dbaseLos Negros Island was cleared of Japanese forces on 25 Mar, but Manus Island was not cleared until May. At the Admiralty Islands, about 4,400 Japanese were killed and 75 prisoners were taken. The Americans, all of whom belonged to the US 1st Cavalry Division (Special), suffered 290 killed and 977 wounded. Despite outnumbering the American forces at the start of the battle, which was extremely rare at this stage of war, Colonel Ezaki was unable to capitalize on the numerical advantage to secure a victory, which would have provided the morale boost that Japan desperately needed. With Admiralty Islands under Allied control, MacArthur commented that "the noose was complete." Rabaul was now choked off with its large garrison of troops idling in frustration.

ww2dbaseAitape and Hollandia
22 Apr 1944-Aug 1944

ww2dbaseOn 22 Apr 1944, a two-pronged attack was launched to attack Aitape and Hollandia on the northern coast of New Guinea island in the Australian Territory of New Guinea. MacArthur had hopes that these two locations would provide the valuable airfields needed to further his attack across the island, and perhaps even bomber fields that might later be used to attack the Philippine Islands. Both landing forces achieved complete surprise. "No withering fire met us at the beach", said MacArthur. "Instead, there was only disorder-rice still boiling in pots, weapons and personal equipment of every kind abandoned. No more than token resistance was met at any point, and there was no interference from the enemy's air or naval forces. In postwar interrogations, Jo Iimura, a Japanese defender in the region at the time, said "[t]he allied invasion of Hollandia and Aitape was a complete surprise to us. After considering the past operational tactics of the enemy... we believed they would attempt to acquire an important position somewhere east of Aitape.... Because we misjudged... we were neither able to reinforce nor send war supplies to their defending units."

ww2dbaseOnce on land, however, Eichelberger's troops discovered that Lieutenant General Hatazo Adachi's 18th Army had regrouped. Adachi's men counterattacked in strength multiple times near Aitape, causing serious casualties. "I cannot find any means nor method which will solve this situation strategically or tactically", said Adachi to his troops. "Therefore, I intend to overcome this by relying on our Japanese Bushido." The first of the such massed attacks took place on 11 Jul, attacking in multiple waves despite heavy casualties from Allied machine guns and artillery. For the next two weeks the Japanese attacks persisted, but to little success. Adachi later acknowledged that he felt he lost ten thousand men during the offensive. On 13 Jul, the Allied forces launched a double enveloping counteroffensive that divided Adachi's remaining troops into two groups, soon rendering them useless. All effective resistance ceased on 10 Aug, though small elements harassed Allied troops in the region until the end of the war.

ww2dbaseWakde
17 May 1944-Aug 1944

ww2dbaseEven before Aitape and Hollandia were secured, MacArthur had already marked Wakde as his next target, mainly due to the fact that Aitape had proved to be unsuitable for the building of major airfields. Lieutenant General Walter Krueger's Sixth Army ("Alamo Force") landed at Wakde on 17 May. They met a similar level of stubborn resistance at Wakde mainly because of Wakde being well established with numerous storage depots. MacArthur claimed to have gained Wakde as an usable base of future operations, but some troops were bogged down in the area until nearly the end of the war.

ww2dbaseBiak
27 May 1944-22 Jul 1944

ww2dbaseAcross Geelvink Bay north of western New Guinea island lay the island of Biak and its three airfields, which could prove to be dangerous as Allied troop transports operated closer and closer to the western tip of New Guinea. With its additional strategic value as an excellent jump-off point for the Philippines, MacArthur sent Major General Fuller and his 41st Division on Operation Hurricane to take the island. "The light enemy resistance at the beachhead held little hint of what was to come", recalled MacArthur. Lieutenant Colonel Naoyuki Kuzume put up a fierce defense that included tanks, which was rare for Japanese troops in this theater of the Pacific War. Kuzume utilized his knowledge of the island's topography and devised a brilliant defense plan that fully utilized the terrain. He was further reinforced by the Second Amphibious Brigade of the Southern Army from Mindanao via "Tokyo Express" during Operation Kon. His effective defense even rendered the airfields, newly captured by the Allies, useless. On 28 Jun, Kuzume's command post, located in one of the numerous caves, was breached. He committed ritual suicide. The remaining caves continued to fight ferociously. Frustrated American troops soon discovered the brutal tactic of simply dynamiting the caves, causing the cave roofs to collapse on the defenders hiding inside. The island was finally secured on 22 Jul.

ww2dbaseAt the conclusion of the Biak actions, Americans killed all but 150 of the 7,200 Japanese defenders (the 150 escaped), while losing 438 of their own. The Americans, similar to other Pacific actions, lost more men from the front lines to diseases than deaths and battle wounds. Biak turned out to be an important battle for another reason. It was the first time Japanese troops effectively used caves as defensive strongholds. Before this point, Japanese troops defended the islands at the beach; when all was lost, surviving troops formed a banzai charge, and the battle was over. After the battle, the Japanese began to include caves as an option, which dramatically increased American casualty rates during operations to secure the subsequent islands.

ww2dbaseNoemfoor
2-7 Jul 1944

ww2dbaseAllied troops landed on the island of Noemfoor, a small island directly west of Biak in Dutch New Guinea, on 2 Jul. After sporadic resistance, the island was declared secure on 7 Jul.

ww2dbaseVogelkop Peninsula and the Conclusion of the New Guinea-Papua Campaign

ww2dbaseThe last obstacle in liberating all of New Guinea island was the Vogelkop Peninsula in Dutch New Guinea. The Japanese resistance on the peninsula gathered at Manokwari, and MacArthur did not wish to contest with this force. Instead, his "hit 'em where they ain't" strategy took the Allied forces to a number of undefended beaches near Cape Opmaria and Sansapor. Like Rabaul, the 25,000 men at Manokwari were now stranded, frustratingly idling uselessly.

ww2dbaseIn Sep 1944, Allied troops occupied the Halmahera Islands, concluding the New Guinea Campaign. MacArthur was now only several hundred miles from the Philippines. In his memoir, MacArthur attributed to the Allied victory over New Guinea to mobility and the ability to achieve surprise at key confrontations. Additionally, he also insisted that his refusal to deploy military governors over conquered regions helped his command focus on the task at hand. Instead, he brought in Dutch and Australian civil administrators immediately after the area had been deemed secure. "The success of this method was reflected in the complete lack of friction between the various governments concerned", he noted.

ww2dbaseAlthough Allied attention would move toward the Philippine Islands by this time, small pockets of Japanese resistance would continue to fight until late May 1945.

New Guinea-Papua Campaign, Phase 3 Interactive Map

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New Guinea-Papua Campaign, Phase 3 Timeline

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