Ganghwa Island incident
1875 CE.
Shown on the map at 37.730°, 126.498°.
The Ganghwa Island incident or the Japanese Battle of Ganghwa (Korean: 운요호 사건 [雲揚號事件] Unyo-ho sageon meaning "Un'yō incident"; Japanese: 江華島事件 Kōka-tō jiken) was an armed clash between the Joseon dynasty of Korea and Japan which occurred in the vicinity of Ganghwa Island on September 20, 1875.
Text from the Wikipedia article Ganghwa Island incident, licensed CC BY-SA 4.0.