Korean War
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Fighting across the 38th Parallel (early 1951)
In January 1951, the Chinese and North Korean forces struck again in their 3rd Phase Offensive (also known as the Chinese Winter Offensive). The Chinese repeated their previous tactics of mostly night attacks, with a stealthy approach from positions some distance from the front, followed by a rush with overwhelming numbers, and using trumpets or gongs both for communication and to disorient their foes. Against this the UN forces had no remedy, and their resistance crumbled; they retreated rapidly to the south (referred to by UN forces as the "bug-out"). Seoul was abandoned and was captured by communist forces on January 4, 1951.

To add to the Eighth Army’s difficulties, General Walker was killed in an accident. He was replaced by a World War II airborne veteran, Lieutenant-General Matthew Ridgway, who took immediate steps to raise the morale and fighting spirit of the battered Eighth Army, which had fallen to low levels during its retreat. Nevertheless, the situation was so grim that MacArthur mentioned the use of atomic weapons against China, much to the alarm of America’s allies.

UN forces continued to retreat until they had reached a line south of Suwon in the west and Wonju in the center, and north of Samchok in the east, where the front stabilized. The People's Volunteer Army had outrun its supply line and was forced to recoil. The Chinese could not go beyond Seoul because they were at the end of their logistics supply line　— all food and ammunition had to be carried at night on foot or bicycle from the Yalu River.

In late January, finding the lines in front of his forces deserted, Ridgway ordered reconnaissance in force, which developed into a full-scale offensive, Operation Roundup. The operation was planned to proceed gradually, to make full use of the UN's superiority in firepower on the ground and in the air; by the time Roundup was completed in early February, UN forces had reached the Han River and re-captured Wonju.

The Chinese struck back in mid-February with their Fourth Phase Offensive, from Hoengsong in the center against IX Corps positions around Chipyong-ni. A short but desperate siege there fought by units of the U.S. 2nd Infantry Division, including the French Battalion, broke up the offensive; in this action, the UN learned how to deal with Chinese offensive tactics and be able to stand their ground.

Roundup was followed in the last two weeks of February 1951, with Operation Killer, by a revitalized Eighth Army, restored by Ridgway to fighting trim. This was a full-scale offensive across the front, again staged to maximize firepower and with the aim of destroying as much of the Chinese and North Korean armies as possible. By the end of Killer, I Corps had re-occupied all territory south of the Han, while IX Corps had captured Hoengsong.

On March 7, 1951, the Eighth Army pushed forward again, in Operation Ripper, and on March 14 they expelled the North Korean and Chinese troops from Seoul, the fourth time in a year the city had changed hands. Seoul was in utter ruins; its prewar population of 1.5 million had dropped to 200,000, with severe food shortages.

MacArthur was removed from command by President Truman on April 11, 1951, for insubordination, setting off a firestorm of protest back in the U.S. The new supreme commander was Ridgway, who had managed to regroup UN forces for the series of effective counter-offensives. Command of Eighth Army passed to General James Van Fleet.

A further series of attacks slowly drove back the communist forces, such as Operations Courageous and Tomahawk, a combined ground- and air-assault to trap communist forces between Kaesong and Seoul. UN forces continued to advance until they reached Line Kansas, some miles north of the 38th parallel.

The Chinese were far from beaten, however; In April 1951 they launched their Fifth Phase Offensive, (also called the Chinese Spring Offensive) This was a major effort, involving three field armies (up to 700,000 men). The main blow fell on I Corps, but fierce resistance in battles at the Imjin River and Kapyong, blunted its impetus, and the Chinese were halted at a defensive line north of Seoul (referred to as the No-Name Line).

A further Communist offensive in the east against ROK and X Corps on May 15 also made initial gains, but by May 20 the attack had ground to a halt. Eighth Army counterattacked and by the end of May had regained Line Kansas.

The decision by UN forces to halt at Line Kansas, just north of the 38th Parallel, and not to persist in offensive action into North Korea, ushered in the period of stalemate which typified the remainder of the conflict.

Stalemate (July 1951 - July 1953)
The rest of the war involved little territory change, large-scale bombing of the north, and lengthy peace negotiations, which began on July 10, 1951, at Kaesong. Even during the peace negotiations, combat continued. For the South Korean and allied forces, the goal was to recapture all of South Korea before an agreement was reached in order to avoid loss of any territory. The Chinese and North Koreans attempted similar operations, and later in the war they undertook operations designed to test the resolve of the UN to continue the conflict. Principal military engagements in this period were the actions around the Punchbowl, in the east, such as Bloody Ridge and Heartbreak Ridge in 1951, the battles for Old Baldy, in the center, and the Hook, in the west, during 1952–53, Battle of Hill Eerie in 1952, and the battle for Pork Chop Hill in 1953.

The peace negotiations went on for two years, first at Kaesong, and later at Panmunjon. A major issue of the negotiations was repatriation of POWs. The Communists agreed to voluntary repatriation but only if the majority would return to China or North Korea, something that did not occur. Since many refused to be repatriated to the communist North Korea and China, the war continued until the Communists eventually dropped this issue.

In October 1951, U.S. forces performed Operation Hudson Harbor intending to establish the capability to use nuclear weapons. Several B-29s conducted individual simulated bomb runs from Okinawa to North Korea, delivering "dummy" nuclear bombs or heavy conventional bombs; the operation was coordinated from Yokota Air Base in Japan. The battle exercise was intended to test "actual functioning of all activities which would be involved in an atomic strike, including weapons assembly and testing, leading, ground control of bomb aiming," and so on. The results indicated that nuclear bombs would be less effective than anticipated, because "timely identification of large masses of enemy troops was extremely rare."

On November 29, 1952, U.S. President-elect Dwight D. Eisenhower fulfilled a campaign promise by going to Korea to find out what could be done to end the conflict. With the UN's acceptance of India’s proposal for a Korean armistice, a cease-fire was established on July 27, 1953, by which time the front line was back around the proximity of the 38th parallel, and so a demilitarized zone (DMZ) was established around it, presently defended by North Korean troops on one side and by South Korean, American and UN troops on the other. The DMZ runs north of the parallel towards the east, and to the south as it travels west. The site of the peace talks, Kaesong, the old capital of Korea, was part of the South before hostilities broke out but is currently a special city of the North. North Korea and the United States signed the Armistice Agreement, with Syngman Rhee refusing to sign.

Casualties
The total numbers of casualties suffered by all parties involved may never be known. In Western countries, the numbers have been subjected to numerous scholarly reviews, and in the case of one U.S. estimate, the number was revised after a clerical error was discovered. Each country's self-reported casualties were largely based upon troop movements, unit rosters, battle casualty reports, and medical records.

The Western numbers of Chinese and/or North Korean casulties are based primarily on battle reports of estimated casualties, interrogation of POWs and captured documents. The Chinese estimation of UN casualties states "The after-war joint declaration of the Chinese People's Volunteers and the Korean People's Army claimed that they 'eliminated 1.09 million enemy forces, including 390,000 from the United States, 660,000 from South Korean, and 29,000 from other countries.' The vague 'eliminated' number gave no details to that of dead, wounded and captured." Regarding their own casualties, the same source said "During the wartime, 70 percent of the forces of the People's Liberation Army (PLA) were dispatched to Korea as the Chinese People's Volunteers (accumulated to 2.97 million), along with more than 600,000 civil workers. The Chinese People's Volunteers suffered 148,000 deaths altogether, among which 114,000 died in combats, incidents, and winterkill, 21,000 died after being hospitalized, 13,000 died from diseases; and 380,000 were wounded. There were also 29,000 missing, including 21,400 POWs, of whom 14,000 were sent to Taiwan, 7,110 were repatriated." This same source concluded with these numbers for North Korean casualties, "The Korean People's Army had 290,000 casualties and 90,000 POWs. There was a large number of civilian deaths in the northern part of Korea, but no accurate figures were available."

The casulties of the various UN forces are listed in the infobox, along with their estimates of Chinese and North Korean forces.    next