New Guinea campaign

New Guinea Campaign
Part of the Pacific Theater of World War II

Australian forces attack Japanese positions near Buna
Date23 January 1942 – August 1945
LocationNew Guinea
Result Allied victory


 United States
 New Zealand
 United Kingdom

 Empire of Japan
Commanders and leaders

U.S. Army:
Douglas MacArthur
George Kenney
Robt. Eichelberger
U.S. Navy:
Arthur S. Carpender
R. Kelly Turner
Theod. S. Wilkinson
Daniel E. Barbey
Australian Army:
George Vasey

Norman Fleay

I.J. Army:
Empire of Japan Hitoshi Imamura
Empire of Japan Hatazō Adachi
Empire of Japan Tomitarō Horii 
Empire of Japan Heisuke Abe [1]
I.J. Navy:
Empire of Japan Isoroku Yamamoto
Empire of Japan Jisaburo Ozawa
Empire of Japan Jinichi Kusaka

Empire of Japan Masatomi Kimura
Casualties and losses
42,000 total[4] 127,600 (New Guinea only)[5]

The New Guinea campaign of the Pacific War lasted from January 1942 until the end of the war in August 1945. During the initial phase in early 1942, the Empire of Japan invaded the Australian-administered territories of the New Guinea Mandate (23 January) and Papua (8 March) and overran western New Guinea (beginning 29/30 March), which was a part of the Netherlands East Indies. During the second phase, lasting from late 1942 until the Japanese surrender, the Allies—consisting primarily of Australian and US forces—cleared the Japanese first from Papua, then the Mandate and finally from the Dutch colony.

The campaign resulted in a crushing defeat and very heavy losses for Empire of Japan. As in most Pacific War campaigns, disease and starvation claimed more Japanese lives than enemy action. Most Japanese troops never even came into contact with Allied forces, and were instead simply cut off and subjected to an extremely effective blockade by the US Navy. Garrisons were effectively besieged and denied shipments of food and medical supplies, and as a result, some claim that 97% of Japanese deaths in this campaign were from non-combat causes.[6]

According to John Laffin, the campaign "...was arguably the most arduous fought by any Allied troops during World War II".[7]


Strategic situation

Papua New Guinea, the Bismarcks and the Northern Solomons

The struggle for New Guinea began with the capture by the Japanese of the city of Rabaul at the northeastern tip of New Britain Island in January 1942 (the Allies responded with multiple bombing raids, of which the Action off Bougainville was one). Rabaul overlooks Simpson Harbor, a considerable natural anchorage, and was ideal for the construction of airfields. Over the next year, the Japanese built up the area into a major air and naval base.

The Japanese 8th Area Army (equivalent to a Euroamerican army), under General Hitoshi Imamura at Rabaul, was responsible for both the New Guinea and Solomon Islands campaigns. The Japanese 18th Army (equivalent to a Euroamerican corps), under Lieutenant General Hatazō Adachi, was responsible for Japanese operations on mainland New Guinea.

The colonial capital of Port Moresby on the south coast of Papua was the strategic key for the Japanese in this area of operations. Capturing it would both neutralize the Allies' principal forward base and serve as a springboard for the invasion of Australia.[8] For the same reasons, General Douglas MacArthur, Supreme Commander Allied Forces South West Pacific Area was determined to hold it. MacArthur was further determined to conquer all of New Guinea in his progress toward the eventual recapture of the Philippines.[9] General Headquarters Southwest Pacific Area Operational Instruction No.7 of 25 May 1942, issued by Commander-Allied-Forces, General Douglas MacArthur, placed all Australian and US Army, Air Force and Navy Forces in the Port Moresby Area under the control of New Guinea Force.[10]

Japanese seizure of Lae and Salamaua

Due north of Port Moresby, on the northeast coast of Papua, are Huon Gulf and the Huon Peninsula. The Japanese entered Lae and Salamaua, two locations on Huon Gulf, unopposed in early March 1942.[11] MacArthur would have liked to deny this area to the Japanese, but he had neither sufficient air nor naval forces to undertake a counterlanding. The Japanese at Rabaul and other bases on New Britain would have easily overwhelmed any such effort (by mid-September, MacArthur's entire naval force under Vice Admiral Arthur S. Carpender consisted entirely of 5 cruisers, 8 destroyers, 20 submarines 7 small craft).[12] The only Allied response was a bombing raid of Lae and Salamaua by aircraft flying over the Owen Stanley Range from the carriers USS Lexington and USS Yorktown, leading the Japanese to reinforce these sites.[13]

Japanese attempt on Port Moresby

Operation Mo was the designation given by the Japanese to their initial plan to take possession of Port Moresby. Their operation plan decreed a five-pronged attack: one task force to establish a seaplane base at Tulagi in the lower Solomons, one to establish a seaplane base in the Louisiade Archipelago off the eastern tip of New Guinea, one of transports to land troops near Port Moresby, one with a light carrier to cover the landing, and one with two fleet carriers to sink the Allied forces sent in response.[14] In the resulting 4–8 May 1942 Battle of the Coral Sea, the Allies suffered higher losses in ships, but achieved a crucial strategic victory by turning the Japanese landing force back, thereby removing the threat to Port Moresby, at least for the time being.[15]

After this failure, the Japanese decided on a longer term, two-pronged assault for their next attempt on Port Moresby. Forward positions would first be established at Milne Bay, located in the forked eastern end of the Papuan peninsula, and at Buna, a village on the northeast coast of Papua about halfway between Huon Gulf and Milne Bay. Simultaneous operations from these two locations, one amphibious and one overland, would converge on the target city.[16]

Crossing the Owen Stanleys

Main article: Kokoda Track campaign

"...the Owen Stanley Range is a jagged, precipitous obstacle covered with tropical rain forest up to the pass at 6500-foot elevation, and with moss like a thick wet sponge up to the highest peaks, 13,000 feet above the sea. The Kokoda Trail [was] suitable for splay-toed Papuan aborigines but a torture to modern soldiers carrying heavy equipment..."

– Samuel Eliot Morison, Breaking the Bismarcks Barrier, p. 34

Buna was easily taken as the Allies had no military presence there (MacArthur wisely chose not to attempt an occupation by paratroopers since any such force would have been easily wiped out by the Japanese). The Japanese occupied the village with an initial force of 1,500 on 21 July and by 22 August had 11,430 men under arms at Buna. Then began the grueling Kokoda Track campaign, a brutal experience for both the Japanese and Australian troops involved. On 17 September, the Japanese had reached the village of Ioribaiwa, just 20 miles from the Allied airdrome at Port Moresby. The Australians held firm and began their counterdrive on 26 September. "...the Japanese retreat down the Kokoda Trail had turned into a rout. Thousands perished from starvation and disease; the commanding general, Horii, was drowned."[17] Thus was the overland threat to Port Moresby permanently removed.[18]

Allied capture of Milne Bay

Main article: Battle of Milne Bay

"Thenceforth, the Battle of Milne Bay became an infantry struggle in the sopping jungle carried on mostly at night under pouring rain. The Aussies were fighting mad, for they had found some of their captured fellows tied to trees and bayoneted to death, surmounted by the placard, 'It took them a long time to die'."

– Samuel Eliot Morison, Breaking the Bismarcks Barrier, p. 38

While it was beyond MacArthur's capabilities to deny Buna to the Japanese, the same could not be said of Milne Bay, which was easily accessible by Allied naval forces. In early June, US Army engineers, Australian infantry and an anti-aircraft battery were landed near the Lever Brothers coconut plantation at Gili Gili, and work was begun on an airfield. By 22 August, about 8,500 Australians and 1,300 Americans were on site.[19] The Japanese arrived and the 25 August – 7 September Battle of Milne Bay was underway. Historian Samuel Eliot Morison summed up the results this way:

...the enemy had shot his bolt; he never showed up again in these waters. The Battle for Milne Bay was a small one as World War II engagements went, but very important. Except for the initial assault on Wake Island, this was the first time that a Japanese amphibious operation had been thrown for a loss ... Furthermore, the Milne Bay affair demonstrated once again that an amphibious assault without air protection, and with an assault force inferior to that of the defenders, could not succeed.[20]

The D'Entrecasteaux Islands lie directly off the northeast coast of the lower portion of the Papuan peninsula. The westernmost island of this group, Goodenough, had been occupied in August 1942 by 353 stranded troops from bombed Japanese landing craft. The destroyer Yayoi, sent to recover these men, was itself bombed and sunk on 11 September. A force of 800 Australian troops landed on 22 October on either side of the Japanese position. Beleaguered, the survivors of the Japanese garrison were evacuated by submarine on the night of 26 October. The Allies proceeded to turn the island into an air base.[21]

Allied recapture of Buna and Gona

Main article: Battle of Buna-Gona

"In the swamp country which surrounded the area were large crocodiles ... Incidence of malaria was almost one hundred per cent. At Sanananda the swamp and jungle were typhus-ridden ... crawling roots reached out into stagnant pools infested with mosquitoes and numerous crawling insects ... every foxhole filled with water. Thompson sub machine-guns jammed with the gritty mud and were unreliable in the humid atmosphere ... "

– John Vader, New Guinea: The Tide Is Stemmed, pp. 102–103

The Japanese drive to conquer all of New Guinea had been decisively stopped. MacArthur was now determined to liberate the island as a stepping-stone to the reconquest of the Philippines. MacArthur's rollback began with the 16 November 1942 – 22 January 1943 Battle of Buna-Gona. The experience of the green US 32nd Infantry Division, just out of training camp and utterly unschooled in jungle warfare, was nearly disastrous. Instances were noted of officers completely out of their depth, of men eating meals when they should have been on the firing line, even of cowardice. MacArthur relieved the division commander and on 30 November instructed Lieutenant General Robert L. Eichelberger, commander of the US I Corps, to go to the front personally with the charge "to remove all officers who won't fight ... if necessary, put sergeants in charge of battalions ... I want you to take Buna, or not come back alive."[22]

"Also formidable was the tenacity of the enemy, who would fight to the death in these stinking holes, starving, diseased and with their dead rotting and unburied beside them."

– John Vader, New Guinea: The Time Is Stemmed, p. 93

The Australian 7th Division under the command of Major General George Alan Vasey, along with the revitalized US 32nd Division, restarted the Allied offensive. Gona fell to the Australians on 9 December 1942, Buna to the US 32nd on 2 January 1943, and Sanananda, located between the two larger villages, fell to the Australians on 22 January.[23]

Operation Lilliput (18 December 1942 – June 1943) was an ongoing resupply operation ferrying troops and supplies from Milne Bay, at the tip of the Papuan Peninsula, to Oro Bay, a little more than halfway between Milne Bay and the Buna-Gona area.


Holding Wau

Main article: Battle of Wau
Two dead Japanese soldiers in a water filled shell hole somewhere in New Guinea

Wau is a village in the interior of the Papuan peninsula, approx. 30 miles southwest of Salamaua. An airfield had been built there during an area gold rush in the 1920s and 1930s. This airfield was of great value to the Australians during the fighting for northeast Papua.[24]

Once the Japanese had decided to give up on Guadalcanal, the capture of Port Moresby loomed even larger in their strategic thinking. Taking the airfield at Wau was a crucial step in this process, and to this end, the 51st Division was transferred from Indochina and placed under General Hitoshi Imamura's Eighth Area Army at Rabaul; one regiment arrived at Lae in early January 1943. In addition, about 5,400 survivors of the Japanese defeat at Buna-Gona were moved into the Lae-Salamaua area. Opposing these forces were the Australian 2/5th, 2/6th and 2/7th Battalions along with Lieutenant Colonel Norman Fleay's Kanga Force.[25]

The Australians decisively turned back the Japanese assault in the ensuing 29–31 January 1943 Battle of Wau. "Within a few days, the enemy was retreating from the Wau Valley, where he had suffered a serious defeat, harassed all the way back to Mubo..."[26] About one week later, the Japanese completed their evacuation of Guadalcanal.

Final Japanese drive on Wau

General Imamura and his naval counterpart at Rabaul, Admiral Jinichi Kusaka, commander Southeast Area Fleet, resolved to reinforce their ground forces at Lae for one final all-out attempt against Wau. If the transports succeeded in staying behind a weather front and were protected the whole way by fighters from the various airfields surrounding the Bismarck Sea, they might make it to Lae with an acceptable level of loss, i.e., at worst half the task force would be sunk en route.[27] It is indicative of the extent to which Japanese ambitions had fallen at this point in the war that a 50% loss of ground troops aboard ship was considered acceptable.

An Allied A-20 bomber attacks Japanese shipping during the Battle of the Bismarck Sea, March, 1943

Three factors conspired to create disaster for the Japanese. First, they had woefully underestimated the strength of the Allied air forces. Second, the Allies had become convinced that the Japanese were preparing a major seaborne reinforcement and so had stepped up their air searches. Most important of all, the bombers of MacArthur's air forces, under the command of Lieutenant General George C. Kenney, had been modified to enable new offensive tactics. Their noses had been refitted with eight 50-caliber machine guns for strafing slow-moving ships on the high seas. In addition, their bomb bays were filled with 500-pound bombs to be used in the newly devised practice of skip bombing.[28]

About 6,900 troops aboard eight transports, escorted by eight destroyers, departed Rabaul at midnight 28 February under the command of Rear Admiral Masatomi Kimura.[29] Through the afternoon of 1 March, the overcast weather held at which point everything began to go wrong for the Japanese. The weather changed direction and Kimura's slow-moving task force was spotted by an Allied scout plane. By the time the Allied bombers and PT boats finished their work on 3 March, Kimura had lost all eight transports and four of his eight destroyers.[30]

" 'The Boeing [B-25] is most terrifying,' wrote one survivor in his diary. 'We are repeating the failure of Guadalcanal. Most regrettable!!' "

– Samuel Eliot Morison, Breaking the Bismarcks Barrier, p. 60

...planes and PTs went about the sickening business of killing survivors in boats, rafts or wreckage. Fighters mercilessly strafed anything on the surface ... The PTs turned their guns on, and hurled depth charges at the three boats which, with over a hundred men on board, sank. It was a grisly task, but a military necessity since Japanese soldiers do not surrender and within swimming distance of shore, they could not be allowed to land and join the Lae garrison.[31]

The remaining destroyers with about 2,700 surviving troops limped back to Rabaul. "The enemy never again risked a transport larger than a small coaster or barge in waters shadowed by American planes. His contemplated offensive against Wau died a-borning."[32]

Operation I-Go

Combined Fleet, Third Fleet and Southeast Area Commanders
Fleet Admiral Isoroku Yamamoto
Vice Admiral Jisaburo Ozawa
Rear Admiral Jinichi Kusaka
Main article: Operation I-Go

Fleet Admiral Isoroku Yamamoto promised the emperor that he would pay back the Allies for the disaster at the Bismarck Sea with a series of massive air strikes. For this, he ordered the air arm of Vice Admiral Jisaburo Ozawa's Third Fleet carriers to reinforce the Eleventh Air Fleet at Rabaul. To demonstrate the seriousness of the effort to the Supreme War Council, multiple shifts of high-ranking personnel were also effected: Both Yamamoto and Ozawa moved their headquarters to Rabaul; and Eighth Fleet commander Vice Admiral Gunichi Mikawa as well as General Imamura's chief of staff were sent to Tokyo with advice and explanations for the respective General Staffs (Admiral Tomoshige Samejima replaced Mikawa as Eight Fleet commander).[33]

I-Go was to be carried out in two phases, one against the lower Solomons and one against Papua.

"At 1400 the Russell Island radar screen became milky with traces of bogeys and Guadalcanal broadcast "Condition Red," followed shortly by an unprecedented "Condition Very Red."

– Samuel Eliot Morison, Breaking the Bismarcks Barrier, p. 120

The first strike, on 7 April, was against Allied shipping in the waters between Guadalcanal and Tulagi. At 177 planes, this was the largest Japanese air attack since Pearl Harbor.[34] Yamamoto then turned his attention to New Guinea: 94 planes struck Oro Bay on 11 April; 174 planes hit Port Moresby on 12 April; and in the largest raid of all, 188 aircraft struck Milne Bay on 14 April.[35]

I-Go demonstrated that the Japanese command was not learning the lessons of air power that the Allies were. The Allied reduction of Rabaul was only made possible by relentless air strikes that took place day after day, but Yamamoto thought the damage inflicted by a few attacks of large formations would derail Allied plans long enough for Japan to prepare a defense in depth. Also, Yamamoto accepted at face value his fliers' over-optimistic reports of damage: they reported a score of one cruiser, two destroyers and 25 transports, as well as 175 Allied planes, a figure that should certainly have aroused some skepticism. Actual Allied losses amounted to one destroyer, one oiler, one corvette, two cargo ships and approximately 25 aircraft.[36] These meager results were not commensurate with either the resources expended or the expectations that had been promoted.

Allied strategy toward Rabaul

Main article: Operation Cartwheel

The umbrella term for the series of strategic actions taken by the Allies to reduce and capture the vast Japanese naval and air facilities at Rabaul was Operation Cartwheel. Two major moves were planned for the end of June:

Eventually, the Joint Chiefs of Staff realized that a landing and siege of "Fortress Rabaul" would be far too costly, and that the Allies' ultimate strategic purposes could be achieved by simply neutralizing and bypassing it. At the Quebec Conference in August 1943, the leaders of the Allied nations agreed to this change in strategy.

Australian soldiers resting in the Finisterre Ranges of New Guinea while en route to the front line
Marines of the 1st Marine Division display Japanese flags captured during the Battle of Cape Gloucester


22 April 1944. US LVTs (Landing Vehicles Tracked) in the foreground head for the invasion beaches at Humboldt Bay, Netherlands New Guinea, during the Hollandia landing as the cruisers USS Boise (firing tracer shells, right center) and USS Phoenix bombard the shore. (Photographer: Tech 4 Henry C. Manger.)


  1. Born in 1886 and died in 1943 after suffering from Dracunculiasis at Wewak.[2]
  2. Biography of Lieutenant-General Heisuke Abe
  3. Tanaka 1980, p. ii.
  4. New Guinea: The US Army Campaigns of World War II. 8,500 prior to January 1943, 24,000 between January 1943 and April 1944, and 9,500 from April 1944 to the end of the war. Retrieved 23 July 2015.
  5. Fenton, Damien (1 June 2004). How many died? (QnA) Australian War Memorial.
  6. Stevens, The Naval Campaigns for New Guinea paragraph 30 Retrieved 10 March 2016.
  7. Laffin 1986, p. 303
  8. Morison 1949, p. 10
  9. Morison 1950, pp. 31–33
  10. GHQ SWPA.
  11. Morison 1950, p. 31
  12. Morison 1950, p. 32
  13. Morison 1950, p. 31
  14. Morison 1949, pp. 10–11
  15. Morison 1949, p. 63
  16. Morison 1950, p. 33
  17. Morison 1950, p. 43
  18. Morison 1950, pp. 33–34
  19. Morison 1950, pp. 36–37
  20. Morison 1950, p. 39
  21. Morison 1950, pp. 39–40
  22. Vader, p. 90
  23. Vader, p. 102
  24. Morison 1950, p. 54
  25. Vader, p. 106
  26. Vader, p. 108
  27. Morison 1950, pp. 54–55
  28. Morison 1950, pp. 56–57
  29. Morison 1950, p. 55
  30. Morison 1950, pp. 58–62
  31. Morison 1950, p. 62
  32. Morison 1950, p. 62
  33. Morison 1950, pp. 117–118
  34. Morison 1950, pp. 120–123
  35. Morison 1950, pp. 125–126
  36. Morison 1950, pp. 127
  37. Morison 1950, pp. 132–133


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