Key Facts
- Dates
- 8–10 June 1945
- Location
- Near Soraken village, Bougainville Island
- Australian unit
- 31st/51st Infantry Battalion, 11th Brigade
- Japanese unit
- 87th Naval Garrison Force
- Result
- Japanese victory; Australians forced to withdraw by sea
- Post-battle impact
- Allied focus shifted from northern to southern Bougainville
Strategic Narrative Overview
Australian troops landed unopposed and established a small beachhead, but several landing craft ran aground, preventing the unloading of heavy weapons and support equipment. The Japanese 87th Naval Garrison Force rapidly surrounded the position. With supplies dwindling and no reinforcement possible, the Australians were compelled to evacuate by sea. During the withdrawal another craft grounded, and multiple rescue attempts over two days were needed before the last survivors were recovered on 11 June.
01 / The Origins
By mid-1945, Australian forces were engaged in the broader Bougainville campaign, attempting to liberate the island from Japanese occupation. In the northern sector, the advance of the 26th and 31st/51st Infantry Battalions had stalled against entrenched Japanese positions on the Ratsua front. A company-sized amphibious flanking operation was conceived to outmaneuver these defenses by landing north of the Porton Plantation jetties.
03 / The Outcome
The Japanese emerged victorious, regaining the initiative in Bougainville's northern sector. In response, Australian commanders redirected operations southward, advancing along the coastal plain toward the main Japanese stronghold at Buin. Post-war analysis attributed the failure to poor intelligence, insufficient resources, and questionable operational necessity, generating lasting criticism of Australian planning for the operation.
Belligerents & Mobilization Analysis
Side A
2 belligerents
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.