This type of flag was put in a fortress where a commanding general was located. In the case of the extant sujagi in Korea, it represented General Eo Jae-yeon who, in 1871, commanded the Korean military forces on Ganghwa Island, which is off the northwest coast of present-day South Korea, nearby the capital of Seoul. It was captured by the United States Asiatic Squadron in June of that year during the United States' expedition to Korea. As with other war prizes, it was put into the collection of the museum at the United States Naval Academy in Annapolis, Maryland.
In October 2007, after many years of petitioning the United States government, the flag was returned to Korea on a long-term, ten-year loan. It is currently housed at the National Palace Museum of Korea in Seoul. 
Sujagi Flag Return