In early July, the first American and UN troops arrived on the Korean Peninsula. Establishing an initial foothold was a long and bloody process, but eventually a perimeter was established around the southern port of Pusan. By the end of August, reinforcements arrived, and General Douglas MacArthur took command of the force. Through the fall, MacArthur orchestrated an amphibious assault on Inch’on, a port located behind North Korean lines, to break Communist positions with an unexpected attack. His plan was risky, but it payed off, capturing the landing zone and then moving south towards Seoul. Meanwhile, other forces pushed northward from their perimeter onto the capital as well, which was taken back by both forces by September 27. With this victory, North Korean forces were no longer organized in the south, and the South Korean government and border were restored by the end of the month. From there, MacArthur’s forces kept the offensive and pushed northward in October to capture the North Korean capital of Pyongyang. However, this action drew a response from Communist Chinese Forces (CCF) to the peninsula’s north. By November, UN forces pushing northward began encountering Chinese divisions offering fierce opposition and attempting to surround them, forcing the UN troops to retreat to Seoul. In early 1951, reorganized UN forces launched a successful counteroffensive to gain lost ground back just beyond the 38th Parallel and established a defensive line there. In late spring, Chinese forces attempted to push through these lines, but were unsuccessful. On July 10 of that year, the first rounds of armistice talks began, but the Communists broke off negotiations in August over disputes about the current border between North and South. Shortly thereafter, Communist forces resumed their offensive and pushed back UN forces slightly. This pattern of attempts at peace talks stagnating and giving way to resumed hostilities continued through 1952 and into 1953. Finally, the negotiations through July succeeded, and an armistice was signed on July 27, 1953. The ceasefire demarcation line reflected the territory controlled by each side at the end of fighting and was close to the 38th Parallel, although North Korea had lost 1,500 square miles of territory. The agreement specified that both sides had to withdraw two kilometers away from the ceasefire line to deter further skirmishes, establishing a demilitarized zone between the two nations that still exists to this day.
After three years of fighting, the Korean War had reached an uneasy conclusion with an armistice that roughly reestablished the prewar boundary between North and South Korea. Technically, the conflict never officially came to an end, as the stalemate did not result in any formal peace settlement after the fact. For this reason, some saw the Korean War as a stalemate at best, if not a defeat by some detractors. However, today historians agree that our troops did succeed in their primary objective: South Korea remained free from Communist rule.