In September 1950, UN Forces had an important plan of launching an all-out offensive along the entire "Pusan Perimeter", a 140-mile (230 km) defensive line around an area on the southeastern tip of South Korea after Inchon landing The main objective was to block the supply route and therefore achieve disruption of the North Korean Army around Pusan Perimeter by hit-and-run tactics[4] and minor objective is to draw away North Korean Army's attention for the success of Inchon landing.

The entire beach and Hill 200 of stronghold was captured by 14:50 at the cost of about 150 casualties (60 KIA, 90 WIA)[5] The ship, LST Musan, was stranded through landing.

On September 19, the Independent 1st Guerrilla Battalion were covered by the 7th Fleet bombardment task force, which had USS Helena as their flagship.

(장사상륙작전참전유격동지회), 51 years since the Jangsa landing operation, the comrades association held a national fund-raising campaign together with the monk of Cheongunsa Temple in Yangpyeong, Gyeonggi-do and established memorial monument on September 14 1991.

[9] On March 6 1997, the forgotten battle of the Korean War was revealed to the public when the members of the 1st Marine Division Special Reconnaissance Unit, who were searching the shore in front of Jangsari, discovered Munsan in the tidal flat under the sea.