On 18 April 1971, due to a strong typhoon hitting Thitu Island (Zhongye Island), the Republic of China (Taiwan) authorities ordered all the garrisons on Zhongye Island to withdraw to Taiping Island to avoid typhoons. However, after the typhoon, the Taiwan side changed its defence, transferred the original troops back to Taiwan, and then used the landing ship to transport new troops to Zhongye Island. The Philippines saw this empty space and organised the troops to land on the island occupied by Taiwan on 29 July and renamed the island "Pag-asa Island". According to the 155th page of the second episode of "The Land Salary" published by the Taiwan Marine Corps Command, the Taiwan Navy detachment that arrived at Zhongye Island on the same day found that the Philippine Marine Corps was on the island, and Captain Hao Deyun immediately ordered the command. The 76mm gun was ready to be fired. The Philippine army on the island is a huge threat to Taiwanese forces, as a result they suddenly received an order from above: no challenge, the troops changed to Taiping Island. These Taiwanese Kuomintang officers and men had to watch the Zhongye Island fall back into the hands of the Philippines.