In March 1951, United Nations forces, primarily consisting of troops from the United States, successfully recaptured the South Korean capital of Seoul from North Korean forces. This event marked the second time the city had changed hands during the conflict, reflecting the intense back-and-forth nature of the Korean War. The battle for Seoul began with a strategic counteroffensive known as Operation Ripper, initiated by General Matthew Ridgway, who aimed to regain control following the earlier capture of the city by North Korean troops in January 1951.

The UN forces executed a well-coordinated attack that involved a combination of air and ground assaults. Their objective was not only to reclaim the capital but also to strengthen the morale of South Korean troops and citizens who had experienced the threats of invasion and occupation. On the night of March 13, 1951, UN troops moved into Seoul and faced little organized resistance, leading to the city's capture the following day. This swift operation highlighted both the weaknesses of the North Korean military at that time and the tactical effectiveness of the UN forces.

The recapture of Seoul significantly shifted the dynamics of the Korean War. It underscored the importance of international support for South Korea in the ongoing conflict while further entrenching the division of the Korean Peninsula into North and South. The victory also allowed UN forces to solidify their presence in the region, setting the stage for future confrontations as the war continued for another two years. Overall, the retaking of Seoul was a critical moment in the Korean War that showcased the determination of UN forces to counter North Korean aggression and protect the sovereignty of South Korea.