Key Facts
- Dates
- 2–4 March 1943
- Transports sunk
- 8 of 8
- Destroyers sunk
- 4 of 8
- Troops dispatched
- 6,900
- Troops reaching Lae
- ~1,200
- Convoy escort aircraft
- ~100 fighter aircraft
Strategic Narrative Overview
Allied codebreakers at FRUMEL in Melbourne and in Washington decrypted Japanese messages revealing the convoy's route and destination. When the convoy departed Simpson Harbour on 28 February 1943, Allied aircraft shadowed it. U.S. Fifth Air Force and RAAF aircraft launched sustained attacks on 2–3 March, employing skip-bombing techniques. All eight transports and four destroyers were sunk. On 4 March, PT boats and aircraft conducted follow-up strikes against survivors on lifeboats and rafts.
01 / The Origins
In December 1942, Japanese Imperial General Headquarters decided to reinforce their garrison at Lae, New Guinea, to sustain their position in the South West Pacific theatre. A convoy of eight troop transports and eight destroyers was assembled at Rabaul to carry approximately 6,900 soldiers. The overland alternative through jungle, swamp, and mountain terrain without roads made a direct sea route the only practical option, despite known Allied air superiority in the region.
03 / The Outcome
Of the 6,900 troops embarked, only about 1,200 reached Lae; roughly 2,700 were rescued by destroyers and submarines and returned to Rabaul. The catastrophic losses led Japan to abandon further attempts to reinforce Lae by sea. This decision significantly hampered Japanese defensive efforts against subsequent Allied offensives along the New Guinea coast.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
2 belligerents
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.