page_title: Battle of the Bismarck Sea
section_title: First attacks
hierarchical_section_title: Battle of the Bismarck Sea / Battle / First attacks
context_page_description: The Battle of the Bismarck Sea took place in the South West Pacific Area during World War II when aircraft of the U.S. Fifth Air Force and the Royal Australian Air Force attacked a Japanese convoy carrying troops to Lae, New Guinea. Most of the Japanese task force was destroyed, and Japanese troop losses were heavy.
  The Japanese convoy was a result of a Japanese Imperial General Headquarters decision in December 1942 to reinforce their position in the South West Pacific. A plan was devised to move some 6,900 troops from Rabaul directly to Lae. The plan was understood to be risky, because Allied air power in the area was strong, but it was decided to proceed because otherwise the troops would have to be landed a considerable distance away and march through inhospitable swamp, mountain and jungle terrain without roads before reaching their destination. On 28 February 1943, the convoy – comprising eight destroyers and eight troop transports with an escort of approximately 100 fighter aircraft – set out from Simpson Harbour in Rabaul.
context_section_description: The Japanese convoy – comprising eight destroyers and eight troop transports with an escort of approximately 100 fighters – assembled and departed from Simpson Harbour in Rabaul on 28 February. During the January operation, a course was followed that hugged the south coast of New Britain. This had made it easy to provide air cover, but being close to the airfields also made it possible for the Allied Air Forces to attack both the convoy and the airfields at the same time. This time, a route was chosen along the north coast, in the hope that the Allies would be deceived into thinking that the convoy's objective was Madang. Allied air attacks on the convoy at this point would have to fly over New Britain, allowing interdiction from Japanese air bases there, but the final leg of the voyage would be particularly dangerous, because the convoy would have to negotiate the restricted waters of the Vitiaz Strait. The Japanese named the convoy "Operation 81."
  The destroyers carried 958 troops while the transports took 5,954. All the ships were combat loaded to expedite unloading at Lae. The commander of the Japanese XVIII Army – Lieutenant General Hatazō Adachi – travelled on the destroyer Tokitsukaze, while that of the 51st Division – Lieutenant General Hidemitsu Nakano – was on board the destroyer Yukikaze. The escort commander – Rear Admiral Masatomi Kimura of the 3rd Destroyer Flotilla – flew his flag from the destroyer Shirayuki. The other five destroyers were Arashio, Asashio, Asagumo, Shikinami and Uranami. They escorted seven Army transports: Aiyo Maru (2,716 gross register tons), Kembu Maru (950 tons), Kyokusei Maru (5,493 tons), Oigawa Maru (6,494 tons), Sin-ai Maru (3,793 tons), Taimei Maru (2,883 tons) and Teiyo Maru (6,870 tons). Rounding out the force was the lone Navy transport Nojima Maru (8,125 tons). All the ships carried troops, equipment and ammunition, except for the Kembu Maru, which carried 1,000 drums of avgas and 650 drums of other fuel.
  The convoy, moving at 7 kn (8.1 mph; 13 km/h), was not detected for some time, because of two tropical storms that struck the Solomon and Bismarck Seas between 27 February and 1 March, but at about 15:00 on 1 March, the crew of a patrolling B-24 Liberator heavy bomber spotted the convoy. Eight B-17 Flying Fortresses were sent to the location but failed to locate the ships.
  At dawn on 2 March, a force of six RAAF A-20 Bostons attacked Lae to reduce its ability to provide support. At about 10:00, another Liberator found the convoy. Eight B-17s took off to attack the ships, followed an hour later by another 20. They found the convoy and attacked with 1,000 lb (450 kg) bombs from 5,000 ft (1,500 m). They claimed to have sunk up to three merchant ships. Kyokusei Maru had sunk carrying 1,200 army troops, and two other transports, Teiyo Maru and Nojima, were damaged. Eight Japanese fighters were destroyed and 13 damaged in the day's action.
  The destroyers Yukikaze and Asagumo plucked 950 survivors of Kyokusei Maru from the water. These two destroyers, being faster than the convoy since its speed was dictated by the slower transports, broke away from the group to disembark the survivors at Lae. The destroyers resumed their escort duties the next day. The convoy – without the troop transport and two destroyers – was attacked again on the evening of 2 March by 11 B-17s, with minor damage to one transport. During the night, PBY Catalina flying boats from No. 11 Squadron RAAF took over the task of shadowing the convoy.
caption: Fifth Air Force bombs bracket the transport Taimei Maru[41]
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