Australian intelligence suggested that the Japanese had concentrated strongly along the approaches to the peninsula, and in order to deal with these positions it was decided that an amphibious landing would be made by a company of the 31st/51st Infantry Battalion near the jetties around Porton Plantation, 3 miles to the north of Ratusa, to outflank them and launch an attack from the rear, while the main force – consisting of the remainder of the 31st/51st and the 26th Infantry Battalion – pushed north from the Ratsua front to establish a new position along a line between Porton and Chindawon.