Operation Mo (Mo Sakusen) or the Port Moresby Operation was the name of the Japanese plan to take control of the Australian Territory of New Guinea during World War II as well as other locations in the South Pacific with the goal of isolating Australia and New Zealand from their ally the United States. The plan was developed by the Imperial Japanese Navy and supported by Admiral Isoroku Yamamoto, the commander-in-chief of the Combined Fleet. The operation failed.
Contents 1 Japanese Navy interest in Operation Mo 2 Strategic lines in Operation Mo 2.1 Japanese countermeasures against Allied response 3 Proposed Japanese forces 4 Actual development of Operation Mo 5 References // Japanese Navy interest in Operation MoDuring the Japanese Navy's planning of their New Guinea Campaign (air strikes against Lae and Salamaua, disembarkation in Huon Gulf, New Britain (Rabaul), New Ireland (Kavieng), Finch Harbor (also called Finschhafen), and the capture of Morobe and Buna), it envisioned those territories as support points to implement the capture of Port Moresby. The implementation of these operations was assigned to the Japanese Naval task force led by Admiral Chūichi Nagumo, after completing the Java campaign. Another important step was the occupation of Christmas Island to the south of Java. The Japanese Navy General Staff had been considering Operation Mo since 1938, as a step in the consolidation of the Southern Seas areas in the Greater East Asia Co-Prosperity Sphere (大東亜共栄圏 Dai-tō-a Kyōeiken).citation needed
Strategic lines in Operation MoThe Directive of Operation Mo was conceived in 1938, but with no specific time for its execution, pending earlier successes in the southern area during the first and second phases of the conquest.
In April 1942, the operation was organized into four large actions and was approved by the Army and Navy General Staffs:
On 3 May, the Light Task Force occupied the port of Tulagi, near Guadalcanal in the Solomon Islands, to establish a seaplane base and a base for operations in the Coral Sea area. The same force was to take Nauru and Banaba Island (Ocean Island) for their valuable phosphate deposits. The South Seas Detachment was to disembark in Port Moresby on 7 May, with another force occupying territory in the Louisiade Archipelago for another seaplane base. Another objective of the South Sea Detachment was the assault on New Caledonia, Fiji, and Samoa. IGHQ assigned a new double objective: capture and secure Port Moresby, in cooperation with the Navy; and seize strategic points of opportunity in eastern New Guinea. Another important Naval force, departing from Truk, was to pass the Eastern Solomons area to the south, finally advancing toward the west in order to intercept the enemy. Following this, strikes were planned on the coastal cities of Coen, Cooktown and Townsville in Queensland, which were terminal points in the supply line between the United States and Australia. The final object was Thursday Island to the north of Cape York. The Japanese had one Air Naval land-based fleet detached in Rabaul, Lae, Salamaua and Buna. This Air fleet executed the air strikes against Port Moresby on 5 May and 6 May, in preparation for the Japanese landing on 7 May. Japanese countermeasures against Allied responseJapanese planners took into account an Allied response to the operation by detaching one task force to the west of parallel between of Rennel and Deboyne Islands and another to the east of same point. These measures would permit a Japanese invasion force to use the Jomard Passage directly to Port Moresby.
Japanese naval intelligence also suspected the presence of the American aircraft carrier USS Yorktown in Coral Sea waters during this period.
Proposed Japanese forcesThe Tulagi assault force was composed of the following units:
Minelayer-cruiser Okinoshima Seaplane tender Kiyokawa Maru Destroyers Kikutsuki, Minatsuki, Mochitsuki and Yuziki two transports smaller support vesselsThe Port Moresby occupation force was composed of the following units:
Light cruisers Yūbari, Mutzuki, Yagoi, Uzuki, Asanagi, Oite and Yunagi Minelayers and sea patrol vessels Seaplane tender Kamikawa Maru Minelayer TsugaruSupporting these operations and intercepting any Allied interference, Rear Admiral Aritomo Goto commanded:
Light carrier Shōhō Heavy cruisers Aoba, Kinugasa, Kako and Furutaka Light cruisers Tenryū, Tatsuta Destroyer SazanamiDuring the course of operation, Yamamoto sent the following heavy support force from Truk, led by Rear Admiral Chuichi Hara:
Fleet carriers Shōkaku and Zuikaku Heavy cruisers Myōkō and Haguro Destroyers Asashio, Arashio, Arare, Kagero, Shiranuhi and Kasumi Auxiliary vesselsSupporting this force was the 25th Air Fleet, (Yokohama Air Corps) led by Rear Admiral Sadayoshi Yamada, based in Rabaul, Lae, Salamaua, Buna and Deboyne island, composed of 60 Mitsubishi A6M "Zero" fighters, 48 Mitsubishi G3M "Nell" and 26 Aichi E13A "Jake" and Mitsubishi F1M "Pete" reconnaissance seaplanes. This unit bombed Port Moresby on 5–6 May, ahead of the Japanese Army-Navy landing on 7 May.
Actual development of Operation MoThe Tulagi assault force began their landings on Tulagi on 3 May. On 4 May 1942, troopships bearing the South Seas Detachment set sail southward from Rabaul for Port Moresby. This same day US aircraft from Yorktown attacked the Tulagi assault force, inflicting heavy damage, but were unsuccessful in preventing the occupation of Tulagi, Gavutu, and Tanambogo islands. Three days later, as a naval engagement appeared to be brewing in the Coral Sea, the Japanese Moresby transports immediately veered back to the north, in order to avoid combat. The resulting Battle of the Coral Sea inflicted significant aircraft losses on the Fourth Fleet, Shōhō was sunk, and Shōkaku was damaged.
The Japanese abandoned their plans to land the South Seas Detachment directly at Port Moresby from the sea. The Japanese Army was making new preparations for combat when, on 11 July, High Command ordered the suspension of the projected actions against New Caledonia, Fiji, and Samoa, because the Combined Fleet was defeated at Midway.
These battles prevented the Japanese landings against Port Moresby. Instead the Japanese army commenced an ultimately unsuccessful campaign to take Port Moresby with an overland approach across the Owen Stanley Range via the Kokoda Track.
References Bullard, Steven (translator) (2007). Japanese army operations in the South Pacific Area New Britain and Papua campaigns, 1942–43. Canberra: Australian War Memorial. ISBN 9780975190487. http://ajrp.awm.gov.au/ajrp/ajrp2.nsf/088031725e4569e4ca256f4f00126373/1fcb61d633972daaca257291000abf44?OpenDocument. Japanese Demobilization Bureaux (1966). Japanese Operations in the Southwest Pacific Area. Volume II Part I. Reports of General MacArthur. United States Army. http://www.history.army.mil/books/wwii/MacArthur%20Reports/MacArthur%20V2%20P1/macarthurv2.htm#contents. Morison, Samuel Eliot (1949 (reissue 2001)). Coral Sea, Midway and Submarine Actions, May 1942-August 1942, vol. 4 of History of United States Naval Operations in World War II. Champaign, Illinois, USA: University of Illinois Press. ISBN 0-252-06995-1. Rottman, Gordon (2005). Japanese Army in World War II. Conquest of the Pacific 1941–42. Battle Orders. Duncan Anderson (consultant editor). Oxford: Osprey. ISBN 1841767891.presentation request form. • take the safety quiz. • curriculum & activities. • tv & radio psa's. • safety video clips. • missouri railroad photos ...
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