[14] On February 21, 1942, more than fifty anti-Japanese dissidents were taken to the island, tortured and killed in a mass execution.

[16] On September 6, 2011, President Ma Ying-jeou visited with the troops stationed on Erdan Island.

[17] The island was handed over from Kinmen Defense Command of the Republic of China Armed Forces to the county government on 1 July 2014.

[18] On August 16, 2022, two Taiwan soldiers on Erdan threw stones at a Chinese drone that got near their guard post.

[20] On March 9, 2023, Chen Chia-hsun (陳嘉壎), a Taiwan soldier on Erdan, was missing at roll call.