The Battle of Dong-Yin (Chinese: 東引海戰) also known as the Battle of May First (Chinese: 五一海戰) was a naval conflict between forces of the Republic of China Navy and the People's Liberation Army Navy around Dongyin island, Fukien Province, Republic of China on 1 May 1965.

Around 12:40 AM on May 1, 1965, a ROCN Northern Division Dong-jiang a PC (patrol craft) on patrol northeast of Dong-Yin Island encountered a PLAN force consisting of 8 fast attack gunboats.

The PLAN combatants attempted to encircle the ROCN destroyer, and the two sides exchanged fire from a distance of 500 to 1,000 yards.

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