page_title: Invasion of Tulagi (May 1942)
section_title: Background
hierarchical_section_title: Invasion of Tulagi (May 1942) / Background
caption_attribution_description: English: Derivativ work of File:Casta-MAP Guadalcanal.jpg showing Guadalcanal Island. Circle around Tulagi Island
context_page_description: The invasion of Tulagi, on 3–4 May 1942, was part of Operation Mo, the Empire of Japan's strategy in the South Pacific and South West Pacific Area in 1942. The plan called for Imperial Japanese Navy troops to capture Tulagi and nearby islands in the British Solomon Islands Protectorate. The occupation of Tulagi by the Japanese was intended to cover the flank of and provide reconnaissance support for Japanese forces that were advancing on Port Moresby in New Guinea, provide greater defensive depth for the major Japanese base at Rabaul, and serve as a base for Japanese forces to threaten and interdict the supply and communication routes between the United States and Australia and New Zealand.
  Without the means to effectively resist the Japanese offensive in the Solomons, the British Resident Commissioner of the Solomon Islands protectorate and the few Australian troops assigned to defend Tulagi evacuated the island just before the Japanese forces arrived on 3 May.
context_section_description: On 7 December 1941, the Japanese attacked the U.S. Pacific Fleet at Naval Station Pearl Harbor, Hawaii. The attack crippled most of the U.S. Pacific Fleet's battleships and started a formal state of war between the two nations. In launching this war, Japanese leaders sought to neutralize the American fleet, seize possessions rich in natural resources, and obtain strategic military bases to defend their far-flung empire. Soon after, other nations—including the United Kingdom, Australia, and New Zealand—joined the U.S. as Allies in the war against Japan. In the words of the Japanese Navy's Combined Fleet "Secret Order Number One", dated 1 November 1941, the goals of the initial Japanese campaigns in the impending war were to, "(eject) British and American strength from the Netherlands Indies and the Philippines, (and) to establish a policy of autonomous self-sufficiency and economic independence." To support these goals, during the first few months of 1942 Japanese forces also attacked and took control of the Philippines, Thailand, Malaya, Singapore, the Netherlands East Indies, Wake Island, New Britain, the Gilbert Islands, and Guam.
  Vice Admiral Shigeyoshi Inoue—commander of the Japanese 4th Fleet (also called the "South Seas Force") consisting of most of the naval units in the South Pacific area—advocated the seizing of Lae, Salamaua, and Port Moresby in New Guinea and Tulagi in the Solomon Islands. Inoue believed that the capture and control of these locations would provide greater security for the major Japanese base at Rabaul on New Britain. Japan's Naval General Staff endorsed Inoue's argument and began planning further operations, using these locations as supporting bases, to seize Nauru, Ocean Island, New Caledonia, Fiji, and Samoa and thereby cut the supply lines between Australia and the U.S., with the goal of reducing or eliminating Australia as a threat to Japanese positions in the South Pacific.
  The Imperial Japanese Army supported the idea of taking Port Moresby and in April 1942, with the Japanese Navy, developed a plan for the attack that was titled "Operation Mo". The plan also included the seizure of Tulagi, a small island in the southern Solomon Islands, where a seaplane base would be set up for potential air operations against Allied territories and forces in the South Pacific. Although Japanese Admiral Isoroku Yamamoto—commander of the Combined Fleet—was concurrently planning an operation that he hoped would lure the U.S. Pacific Fleet into a decisive showdown in the central Pacific, he detached some of his large warships to support the Mo operation and placed Inoue in charge of the naval portion of the operation.
  A large force consisting of two heavy aircraft carriers, one light aircraft carrier, a seaplane carrier, nine cruisers, and 13 destroyers—split into several elements—was to guard the Japanese Port Moresby invasion convoy as well as to engage any Allied naval warships that approached to contest the invasion. The Tulagi invasion force, consisting of the destroyers Kikuzuki and Yūzuki; minelayer/transports Okinoshima, and Kōei Maru; auxiliary minesweepers Wa-1, Wa-2, Hagoromo Maru, Noshiro Maru #2, and Tama Maru; transport, Azumasan Maru; subchasers Toshi Maru #3 and Tama Maru #8; and commanded by Rear Admiral Kiyohide Shima (flag on Okinoshima), departed from Rabaul on 30 April and headed towards the Solomon Islands. Rear Admiral Aritomo Gotō provided air cover for the Tulagi invasion with his Covering Group of one light carrier (Shōhō), four cruisers, and one destroyer located just west of the central Solomons. A separate Cover Force (sometimes referred to as the Tulagi Support Group)—commanded by Rear Admiral Kuninori Marumo and consisting of two light cruisers, the seaplane tender Kamikawa Maru, and three gunboats—joined the Covering Group in supporting the Tulagi invasion. Once Tulagi was secured on 3 or 4 May, the Covering Group and Cover Force were to reposition to help cover the Port Moresby invasion.
  At the time, Tulagi was the capital of the British Solomon Islands Protectorate, which
caption: Map of Guadalcanal and Tulagi (circle) as the area appeared in 1942
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