sentences:  The landings were undertaken simultaneously with the amphibious invasion of Aitape ("Operation Persecution") to the east.The battle was an unqualified success for the US forces, resulting in a withdrawal by the Japanese to a new strategic defence line in the west of New Guinea and the abandonment of all positions in the east of the island.Hollandia was a port on the north coast of New Guinea, part of the Dutch East Indies, and was the only anchorage between Wewak to the east, and Geelvink Bay to the west.