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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 Kōkatō jiken), was a purposely armed clash between the Joseon Dynasty of Korea and Japan which occurred in the vicinity of Ganghwa Island on September 20, 1875. It was a form of gunboat diplomacy and this incident occurred intentionally for the purpose of invading Joseon.

Battle of Ganghwa
Soldiers from the Un'yō attacking the Yeongjong castle on a Korean island (woodblock print, 1876).jpg
Japanese marines landing from the Unyo at Yeongjong Island which is near Ganghwa.
Date September 20, 1875
Location Ganghwa Island, Yellow Sea, Joseon
Modern day: Ganghwa Island, Yellow Sea, South Korea

Japanese victory

  • Severe damage inflicted on Korean defenses.
 Empire of Japan Flag of the King of Joseon (fringeless).svg Kingdom of Joseon
Commanders and leaders
Inoue Yoshika Unknown
22 sailor and
1 gunboat
500 infantry
Artillery pieces
Casualties and losses
1 killed
1 wounded
35 killed
16 captured
36 artillery piece and small cannon captured
1 fort destroyed



In the second half of the 19th century, the Korea peninsula was the scene of a power struggle between several imperial powers including the Russians and the French, as well as the Chinese and the Japanese.

The Meiji Restoration of 1868 ended the 265-year-old feudalistic Tokugawa shogunate in Japan. The new government of Japan sent a messenger holding a letter with the sovereign's message which informed of the founding of a new administration of Japan to the government of the Korean Joseon Dynasty on December 19, 1868.

However, the Koreans refused to receive the letter because it contained the Chinese characters ("royal, imperial") and ("imperial decree").[1] According to the political system of the day, only the Chinese emperor was allowed to use these characters, as they signified the imperial authority of China.[1] Hence, their use by a Japanese sovereign was considered unacceptable to Joseon Korea, as it implied he was an equal of the emperor of China.[2]

The Chinese suggested to the Koreans to receive the sovereign letter from Japan, because China knew the power of Japan at that moment.[3] Despite government-level negotiations held in 1875 at Busan, no substantial progress was made. Instead, tension grew as the Koreans continued to refuse to recognize Japan's claims of equality with China and Japanese politicians insisted on the conquest of the Joseon Dynasty to solve social problems in Japan.

Battle of GanghwaEdit

In 1875, the Un'yō, a small Japanese warship under the command of Inoue Yoshika, was dispatched to survey coastal waters without Korean permission.

On September 20, the ship reached Ganghwa Island, which had been a site of violent confrontations between Korean forces and foreign forces in the previous decade. In 1866, the island was briefly occupied during the French expedition against Korea, and in 1871 subject to an American expedition.

The landing of the forces of the Un'yō at Ganghwa Island. Japanese woodblock print.

The memories of those confrontations were very fresh, and there was little question that the Korean garrison would shoot at any approaching foreign ship. Nonetheless, Commander Inoue ordered a small boat launched – allegedly in search of drinkable water. The Korean forts opened fire. The Un'yō brought its superior firepower to bear and silenced the Korean guns, then sent a landing force ashore to fight the Koreans on land. The Japanese army landed at Yeongjong-jeon (Yeongjong-do, today's Yeongjong-do) and committed arson, murder, and plundering to the residents. The Japanese ended their attack and withdrew back to Japan.


The number of casualties of the incident is 35 of the Joseon Dynasty and two Japanese soldiers were wounded. In addition, 16 Korean naval forces were captured by Japan. Many weapons were also looted. After the incident, the Imperial Japanese Navy blockaded the immediate area and requested an official apology from the Joseon government, which was concluded with the dispatch of the Kuroda mission and the signing of the Treaty of Ganghwa on February 27, 1876, which opened the Korean Peninsula to Japanese and foreign trade.

See alsoEdit


  1. ^ a b 国史大辞典編集委員会編, ed. 國史大辭典. Vol. 9. Tokyo: 吉川弘文館, 1988, p 503 (Japanese)
  2. ^ 吉田光男編『日韓中の交流』, 山川出版社, 2004, p 22 (Japanese)
  3. ^ OH, Bonnie. Sino-Japanese Rivalry in Korea. p.43