page_title: Battle of the Coral Sea
section_title: Prelude
hierarchical_section_title: Battle of the Coral Sea / Battle / Prelude
caption_attribution_description: English: Battle of the Coral Sea
context_page_description: The Battle of the Coral Sea, from 4 to 8 May 1942, was a major naval battle between the Imperial Japanese Navy and naval and air forces of the United States and Australia. Taking place in the Pacific Theatre of World War II, the battle is historically significant as the first action in which aircraft carriers engaged each other and the first in which the opposing ships neither sighted nor fired directly upon one another.
  In an attempt to strengthen their defensive position in the South Pacific, the Japanese decided to invade and occupy Port Moresby and Tulagi. The plan, Operation Mo, involved several major units of Japan's Combined Fleet. They included two fleet carriers and a light carrier to provide air cover for the invasion forces, under the overall command of Admiral Shigeyoshi Inoue.
  The US learned of the Japanese plan through signals intelligence and sent two US Navy carrier task forces and a joint Australian-American cruiser force to oppose the offensive, under the overall command of US Admiral Frank J. Fletcher.
context_section_description: During late April, the Japanese submarines Ro-33 and Ro-34 reconnoitered the area where landings were planned. The submarines investigated Rossel Island and the Deboyne Group anchorage in the Louisiade Archipelago, Jomard Channel, and the route to Port Moresby from the east. They did not sight any Allied ships in the area and returned to Rabaul on 23 and 24 April respectively.
  The Japanese Port Moresby Invasion Force, commanded by Rear Admiral Kōsō Abe, included 11 transport ships carrying about 5,000 soldiers from the IJA's South Seas Detachment plus approximately 500 troops from the 3rd Kure Special Naval Landing Force (SNLF). Escorting the transports was the Port Moresby Attack Force with one light cruiser and six destroyers under the command of Rear Admiral Sadamichi Kajioka. Abe's ships departed Rabaul for the 840 nmi (970 mi; 1,560 km) trip to Port Moresby on 4 May and were joined by Kajioka's force the next day. The ships, proceeding at 8 kn (9.2 mph; 15 km/h), planned to transit the Jomard Channel in the Louisiades to pass around the southern tip of New Guinea to arrive at Port Moresby by 10 May. The Allied garrison at Port Moresby numbered around 5,333 men, but only half of these were infantry and all were badly equipped and undertrained.
  Leading the invasion of Tulagi was the Tulagi Invasion Force, commanded by Rear Admiral Kiyohide Shima, consisting of two minelayers, two destroyers, six minesweepers, two subchasers and a transport ship carrying about 400 troops from the 3rd Kure SNLF. Supporting the Tulagi force was the Covering Group with the light carrier Shōhō, four heavy cruisers, and one destroyer, commanded by Rear Admiral Aritomo Gotō. A separate Cover Force (sometimes referred to as the 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 providing distant protection for the Tulagi invasion. Once Tulagi was secured on 3 or 4 May, the Covering Group and Cover Force were to reposition to help screen the Port Moresby invasion. Inoue directed the MO operation from the cruiser Kashima, with which he arrived at Rabaul from Truk on 4 May.
  Gotō's force left Truk on 28 April, cut through the Solomons between Bougainville and Choiseul and took station near New Georgia Island. Marumo's support group sortied from New Ireland on 29 April headed for Thousand Ships Bay, Santa Isabel Island, to establish a seaplane base on 2 May to support the Tulagi assault. Shima's invasion force departed Rabaul on 30 April.
  The Carrier Strike Force, with the carriers Zuikaku and Shōkaku, two heavy cruisers, and six destroyers, sortied from Truk on 1 May. The strike force was commanded by Vice Admiral Takeo Takagi (flag on cruiser Myōkō), with Rear Admiral Chūichi Hara, on Zuikaku, in tactical command of the carrier air forces. The Carrier Strike Force was to proceed down the eastern side of the Solomon Islands and enter the Coral Sea south of Guadalcanal. Once in the Coral Sea, the carriers were to provide air cover for the invasion forces, eliminate Allied air power at Port Moresby, and intercept and destroy any Allied naval forces which entered the Coral Sea in response.
  En route to the Coral Sea, Takagi's carriers were to deliver nine Zero fighter aircraft to Rabaul. Bad weather during two attempts to make the delivery on 2–3 May compelled the aircraft to return to the carriers, stationed 240 nmi (280 mi; 440 km) from Rabaul, and one of the Zeros was forced to ditch in the sea. In order to try to keep to the MO timetable, Takagi was forced to abandon the delivery mission after the second attempt and direct his force towards the Solomon Islands to refuel.
  To give advance warning of the approach of any Allied naval forces, the Japanese sent submarines I-22, I-24, I-28 and I-29 to form a scouting line in the ocean about 450 nmi (520 mi; 830 km) southwest of Guadalcanal. Fletcher's forces had entered the Coral Sea area before the submarines took station, and the Japanese were therefore unaware of their prese
caption: Map of the battle, 3–9 May, showing the movements of most of the major forces involved[21]
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