New Guinea campaign

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 cleared the Japanese first from Papua, then the Mandate and finally from the Dutch colony.

1942

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 Lieut. 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. 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. 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.

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. 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). 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.

Battle of the Coral Sea

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. 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.

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.

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." Thus was the overland threat to Port Moresby permanently removed.

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. 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.

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.

Allied recapture of Buna and 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 Lieut. Gen. 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."

"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 Maj. Gen. 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 32nd on 2 January 1943, and Sanananda, located between the two larger villages, fell to the Australians on 22 January.

1943

Holding 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.

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 Lieut. Col. Norman Fleay's Kanga Force.

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..."

Battle of the Bismarck Sea

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. 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 Lieut. 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 bombays were filled with 500-pound bombs to be used in the newly devised practice of skip bombing.

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. 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.

" '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.

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."

Fleet Numbering System

Pacific Theatre Amphibious Commanders

Rear Adm. Richmond Kelly Turner

Rear Adm. Theodore S. Wilkinson

Rear Adm. Daniel E. Barbey

Admiral Ernest J. King, US Chief of Naval Operations, ordered all American naval forces in the Pacific Theatre to be identified by number rather than by geographic area effective 15 March 1943:

• Adm. William F. Halsey's South Pacific Area was redesignated Third Fleet. Halsey's amphibious commander was Rear Adm. Richmond Kelly Turner; Turner was replaced as head of III 'Phib on 15 July by Rear Adm. Theodore Stark "Ping" Wilkinson.

• Vice Adm. Raymond A. Spruance's Central Pacific Area was redesignated Fifth Fleet. This unit's amphibious command was set up in August by Rear Adm. Turner who had been transferred from Third Fleet for the purpose.

• The naval forces of Gen. Douglas MacArthur's Southwest Pacific Area, led by Vice Adm. Arthur S. Carpender, were redesignated Seventh Fleet (Carpender was replaced 26 November by Vice Adm. Thomas C. Kinkaid). The head of VII 'Phib was Rear Adm. Daniel E. "Uncle Dan the Amphibious Man" Barbey.

From this point forward, task forces were numbered with the first digit of the task force indicating the parent fleet.

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:

• Turner's III 'Phib undertook Operation Toenails, the invasion of the New Georgia Islands halfway up the Solomons chain (30 June – 7 October 1943).

• Barbey's VII 'Phib carried out two almost simultaneous undertakings. Operation Chronicle, the capture of the Trobriand Islands between Papua and the Solomons (22 – 30 June 1943), and the landing of a combined American/Australian force at Nassau Bay on the Papuan coast just south of Huon Gulf (30 June – 6 July 1943).

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

Soldiers of the 1st Marine Division display Japanese flags captured during the Battle of Cape Gloucester

New Britain campaign

• Salamaua-Lae campaign (22 Apr – 16 Sep 1943)
  • Landing at Nassau Bay
  • First Battle of Mubo
  • First Battle of Bobdubi
  • Battle of Lababia Ridge
  • Second Battle of Bobdubi
  • Second Battle of Mubo
  • Battle of Roosevelt Ridge
  • Battle of Mount Tambu
  • Operation Postern
    • Landing at Lae
    • Landing at Nadzab
• Bombing of Wewak (17–21 Aug 1943)
• Finisterre Range campaign (1943–1944: Including a series of actions known as the Battle of Shaggy Ridge)
  • Ramu Valley campaign
  • Battle of Johns' Knoll-Trevor's Ridge
  • Battle of The Pimple
  • Battle of Cam's Saddle
  • Operation Cutthroat
    • Battle of Faria Ridge
    • Battle of Prothero I and II
    • Battle of McCaughey's Knoll
    • Battle of Kankiryo Saddle
• Huon Peninsula campaign (22 Sep 1943 – 1 Mar 1944)
  • Battle of Scarlet Beach
  • Battle of Finschhafen
  • Battle of Sattelberg
  • Battle of Jivevaneng
  • Battle of Wareo
  • Battle of Sio
  • Landing at Saidor
• Bombing of Rabaul (November 1943)
• Bougainville campaign (1 Nov 1943 – 21 Aug 1945)
• New Britain campaign (15 Dec 1943 – 21 Aug 1945)

1944–45

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.)

• Admiralty Islands campaign (1944)
• Western New Guinea campaign (1944–1945)
  • Operations Reckless and Persecution
    • Landing at Aitape
    • Landing at Hollandia
  • Battle of Wakde
  • Battle of Lone Tree Hill (1944)
  • Battle of Morotai
  • Battle of Biak
  • Battle of Noemfoor
  • Battle of Driniumor River
  • Battle of Sansapor
  • Aitape-Wewak campaign

External links

• Translation of the official record by the Japanese Demobilization Bureaux detailing the Imperial Japanese Army and Navy's participation in the Southwest Pacific area of the Pacific War.
• National Archive Video of Hollandia Bay, New Guinea Invasion
• A film clip ALLIES STUDY POST-WAR SECURITY ETC. (1944) is available at the Internet Archive