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On June 27, Truman ordered U.S. military forces into South Korea. They established a defensive line on the far southern part of the Korean peninsula near the town of Pusan. A U.S.-led invasion at Inchon on September 15 halted the North Korean advance and turned it into a retreat ( [link] ). As North Korean forces moved back across the thirty-eighth parallel, UN forces under the command of U.S. General Douglas MacArthur followed. MacArthur’s goal was not only to drive the North Korean army out of South Korea but to destroy Communist North Korea as well. At this stage, he had the support of President Truman; however, as UN forces approached the Yalu River, the border between China and North Korea, MacArthur’s and Truman’s objectives diverged. Chinese premier Zhou Enlai, who had provided supplies and military advisors for North Korea before the conflict began, sent troops into battle to support North Korea and caught U.S. troops by surprise. Following a costly retreat from North Korea’s Chosin Reservoir, a swift advance of Chinese and North Korean forces and another invasion of Seoul, MacArthur urged Truman to deploy nuclear weapons against China. Truman, however, did not wish to risk a broader war in Asia. MacArthur criticized Truman’s decision and voiced his disagreement in a letter to a Republican congressman, who subsequently allowed the letter to become public. In April 1951, Truman accused MacArthur of insubordination and relieved him of his command. The Joint Chiefs of Staff agreed, calling the escalation MacArthur had called for “the wrong war, at the wrong place, at the wrong time, and with the wrong enemy.” Nonetheless, the public gave MacArthur a hero’s welcome in New York with the largest ticker tape parade in the nation’s history.

A map of North and South Korea, bordered by China to the north, the Yellow Sea to the west, the Sea of Japan to the east, and Japan to the southeast, is shown. Purple arrows show the North Korean invasion of South Korea in 1950; green arrows show the UN offensive response and the site of the landing at Inchon on September 15, 1950, and orange arrows should the Communist Chinese offensive. A dotted orange line shows the truce line of 1953. A grey dotted line shows the UN defensive line in September 1950, and a dotted green line shows the northern-most UN advance in November 1950.
After the initial invasion of South Korea by the North Korean People’s Democratic Army, the United Nations established a defensive line in the southern part of the country. The landing at Inchon in September reversed the tide of the war and allowed UN forces under General Douglas MacArthur to retake the city of Seoul, which had fallen to North Korean troops in the early days of the war.

By July 1951, the UN forces had recovered from the setbacks earlier in the year and pushed North Korean and Chinese forces back across the thirty-eighth parallel, and peace talks began. However, combat raged on for more than two additional years. The primary source of contention was the fate of prisoners of war. The Chinese and North Koreans insisted that their prisoners be returned to them, but many of these men did not wish to be repatriated. Finally, an armistice agreement was signed on July 27, 1953. A border between North and South Korea, one quite close to the original thirty-eighth parallel line, was agreed upon. A demilitarized zone between the two nations was established, and both sides agreed that prisoners of war would be allowed to choose whether to be returned to their homelands. Five million people died in the three-year conflict. Of these, around 36,500 were U.S. soldiers; a majority were Korean civilians.

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Source:  OpenStax, U.s. history. OpenStax CNX. Jan 12, 2015 Download for free at http://legacy.cnx.org/content/col11740/1.3
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