High Quality Content by WIKIPEDIA articles! The Battle of Porton Plantation (8–10 June 1945) took place at Porton Plantation, near the village of Soraken on Bougainville Island, in the Solomon Islands archipelago during World War II. Involving forces from Australia, New Zealand and Japan, the battle was part of the wider Bougainville campaign, which had begun in late 1943 and lasted until the end of the war in August 1945.