 From May 25, 1950 thru May 28, 1950, Ox Head (Niutou, 牛头) island, Spider Islet (Zhi Zhou, 蜘洲), Dalu (大碌), Large Head Islet (Datou Zhou, 大头洲) and other small islets fell into the communist hands.On May 28, 1950, the nationalist naval force at the region was reinforced by 3 frigates, 2 landing ships, 4 minesweepers, and several gunboats newly arrived from Taiwan.The nationalist naval force cruised in waters north of Little Green Islet (Xiaoqingzhou, 小青洲) and Ox Head (Niutou, 牛头) island, attempted to bombard the communist positions on lands and the transport fleet.