Seoul was occupied by the North Koreans twice during the Korean War.
The capital of South Korea fell to invaders from North Korea in June 1950, inciting President Harry Truman to commit American troops as part of United Nations forces sent to repel the invasion.
U.N. forces recaptured Seoul on September 26, only to be forced out when Communist China entered the war and recaptured Seoul in January 1951.
The U.N. forces retook Seoul on March 14.