Battle of the Bismarck Sea

Battle of the Bismarck Sea
Part of the New Guinea Campaign of the Pacific Theater (World War II)
A ship viewed from far above. There are a dozen splashes in the water around it.
Japanese transport under aerial attack in the Bismarck Sea, 3 March 1943
Date2–4 March 1943
Location
Bismarck Sea, in the vicinity of Lae
Result Allied victory
Belligerents
 United States
 Australia
 Japan
Commanders and leaders
United States Ennis Whitehead
Australia Joe Hewitt
Empire of Japan Gunichi Mikawa
Empire of Japan Masatomi Kimura
Strength
39 heavy bombers;
41 medium bombers;
34 light bombers;
54 fighters
10 torpedo boats
8 destroyers,
8 troop transports,
100 aircraft
Casualties and losses
2 bombers destroyed,
4 fighters destroyed,
13 killed[1]
8 transports sunk,
4 destroyers sunk,
20 fighters destroyed,
2,890+ dead[2]

The Battle of the Bismarck Sea (2–4 March 1943) took place in the South West Pacific Area (SWPA) during World War II when aircraft of the U.S. Fifth Air Force and the Royal Australian Air Force (RAAF) 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.

The Allies had detected preparations for the convoy, and naval codebreakers in Melbourne (FRUMEL) and Washington, D.C., had decrypted and translated messages indicating the convoy's intended destination and date of arrival. The Allied Air Forces had developed new techniques, such as skip bombing, that they hoped would improve the chances of successful air attack on ships. They detected and shadowed the convoy, which came under sustained air attack on 2–3 March 1943. Follow-up attacks by PT boats and aircraft were made on 4 March on life boats and rafts. All eight transports and four of the escorting destroyers were sunk. Of 6,900 troops who were badly needed in New Guinea, only about 1,200 made it to Lae. Another 2,700 were rescued by destroyers and submarines and returned to Rabaul. The Japanese made no further attempts to reinforce Lae by ship, greatly hindering their ultimately unsuccessful efforts to stop Allied offensives in New Guinea.

  1. ^ Cite error: The named reference Gillison, p. 695 was invoked but never defined (see the help page).
  2. ^ Gillison 1962, p. 696

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