The United States expedition to Korea, the Shinmiyangyo in 1871

The United States expedition to Korea, the Shinmiyangyo, or simply the Korean Expedition, in 1871, was the first American military action in Korea. It took place predominantly on and around the Korean island of Ganghwa. The reason for the presence of the American naval force in Korea was to support an American diplomatic delegation sent to establish trade and political relations with the peninsular nation, to ascertain the fate of the merchant ship General Sherman, and to establish a treaty assuring aid for shipwrecked sailors. When Korean shore batteries attacked two American warships on June 1, 1871, a punitive expedition was launched ten days later after the commanding American admiral failed to receive an official apology from the Koreans. The isolationist nature of the Joseon Dynasty government and the assertiveness of the Americans led to a misunderstanding between the two parties that changed a diplomatic expedition into an armed conflict. On June 10, about 650 Americans landed and captured several forts, killing over 200 Korean troops with a loss of only three dead. Korea continued to refuse to negotiate with the United States until 1882.

Aftermath

A Korean junk in 1871, taken by the Americans during the expedition.

The United States was not able to achieve its objectives diplomatically, as the Koreans refused to negotiate. In fact, these events led the regent Daewon-gun to strengthen his policy of isolation and issue a national proclamation against appeasing foreigners. However, in 1876, Korea established a trade treaty with Japan after Japanese ships approached Ganghwado and threatened to fire on Seoul. Treaties with European countries and the U.S. soon followed.
Nine sailors and six Marines were awarded the Medal of Honor, the first for actions in a foreign conflict.