 From 1939 to 1950, opium poppy planting and the manufacture and sale of opium was an economic mainstay for the islanders.In the wake of the surrender of Japan in Autumn 1945, representatives of Siapu County, Changlo County and Lienchiang County visited Dongyin (Tungyung) and contested control of the islands between their counties.The provincial government determined that Dongyin (Tungyung) was part of Lienchiang County.