 The operation was opened with an assault by the inexperienced 58th/59th Infantry Battalion, and included hand-to-hand combat.At the same time as the second Australian assault on Bobdubi, on 30 June – 4 July, the US 162nd Regimental Combat Team (162nd RCT), supported by engineers from the 2nd Engineer Special Brigade, made an unopposed amphibious landing at Nassau Bay and established a beachhead there, to launch a drive along the coast, as well as bringing ashore heavy guns with which to reduce the Japanese positions.A week after the Bobdubi attack and Nassau Bay landing, the Australian 17th Brigade launched another assault on Japanese positions at Mubo.