Erhtan

Little Quemoy is a mountain of tunneled rock between the larger island and the mainland. Chief among the outer defenses of these two are the tiny Tan Islands—Tatan, Erhtan and a still-smaller islet. Control of the Tans, which may be the Chinese Reds first objective, would give them a means of tightening the blockade of the Quemoys still further.

1958 September 12, “War in Asia: Reds to Push to Edge”, in U.S. News & World Report, volume XLV, number 11, →ISSN, →OCLC, page 34, column 2

Tatan and Erhtan, two rocky outposts of Kinmen, are some nine miles southwest of Kinmen and within yelling distance of the Communist-held mainland.[…] The story is at once thrilling and heart warming. Organized into teams of three men each, the unsung heroes would launch their supply-ladden small motorboat in the darkness of night and sail stealthily to the brink of the death trap, the surrounding waters of Tatan and Erhtan.

1958 December 1, “Theirs Is Not To Ask Why”, in Taiwan Today, archived from the original on 17 Apr 2023

On Erhtan island, two hundred feet above the dark waters of Amoy's outer bay, Company Commander Captain Chun Hua Tang stood listening to the same sound that had stopped the fisherman Go-sze Yuan in his escape attempt.

1962, DeWitt S. Copp, “The Mudcats”, in The Odd Day, William Morrow and Company, →LCCN, →OCLC, page 18

Tatan and Erhtan are two small islands in the sea southwest of Kinmen.[…]A contingent of some 30 Communist troops tried to land at Erhtan, but were disarmed by Government defenders.

1981, A Pictorial History of the Republic of China: Its Founding and Development, volume II, Taipei: Modern China Press, →OCLC, page 303, column 1

Since 1979, the paper says, PLA units in Fujian Province have completely stopped their shelling of Dajinmen and Xiaojinmen (Greater and Lesser Quemoy), Dadan (Tatan), Erdan (Erhtan) and other islands where Kuomintang troops are stationed. The KMT have also decreased their shelling of the mainland, it adds.

1984 January 30 [1984 January 27], “PLA Paper Sees 'Relaxing' Situation in Taiwan Strait”, in Daily Report: China, volume I, number 020, Foreign Broadcast Information Service, sourced from Beijing XINHUA Domestic Service, →ISSN, →OCLC, China: PRC Media on Taiwan Affairs, page U 1