Key Facts
- Year
- 1871
- U.S. warships deployed
- 5 Asiatic Squadron vessels
- U.S. objective
- Investigate SS General Sherman crew fate and seek trade treaty
- Conflict type
- Naval and amphibious assault on Korean forts
Strategic Narrative Overview
What began as a nominally peaceful mission escalated into armed conflict when Korean fort guns on Ganghwa Island opened fire on the approaching American vessels without warning. U.S. forces responded by launching an assault to capture the island's fortifications. The battle to seize the Ganghwa forts became the largest and most intense engagement of the entire expedition, involving naval bombardment and an amphibious landing by American marines and sailors.
01 / The Origins
In 1871, the United States dispatched five Asiatic Squadron warships from Japan to Korea with a dual mission: to determine the fate of the crew of the merchant vessel SS General Sherman, which had disappeared in Korean waters, and to negotiate a trade treaty with the isolationist Joseon kingdom, mirroring the agreement Commodore Perry had extracted from Japan in the early 1850s. Korea's strict exclusion policy made diplomatic overtures difficult.
03 / The Outcome
Despite capturing the Ganghwa forts, the United States failed to secure a trade treaty with Joseon. Korean authorities refused negotiations, and American forces eventually withdrew. The expedition did not achieve its diplomatic objectives, and Korea remained closed to Western commerce for nearly another decade until the Joseon–U.S. Treaty of 1882 finally established formal relations between the two countries.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.