The Chinese Second Phase Offensive overturned the prospect of a quick United Nations victory in the Korean War and turned an advance toward the end of the conflict into a desperate retreat. Its immediate shock came not only from the scale of the Chinese counterattack, but from the speed with which the military situation reversed: MacArthur’s offensive began on November 24, 1950, and on November 28 Harry S. Truman was told that a force of 260,000 Chinese troops had entered the fighting. The crisis then tested whether the United States would broaden the war or limit it, even as its forces faced defeat in the field.

Background and the Offensive

The advance that preceded the offensive rested on a plan MacArthur presented as decisive. In driving north, he divided his forces, sending the U.S. Tenth Corps up the eastern side of the peninsula and the Eighth Army up the west. The Joint Chiefs of Staff questioned the risk of separating the forces, but MacArthur remained adamant. The success of the Inchon landing had reinforced his confidence in audacious maneuvers; neither the Pentagon nor the White House shared his certainty, yet no one—including Truman—stopped the plan.

MacArthur described the coming operation as an “end-the-war” offensive, a “massive comprehensive envelopment” that he believed would quickly secure victory. The hope that the fighting might soon be over acquired a memorable human measure when, on a visit to Eighth Army headquarters on the Chongchon River, he said within hearing of correspondents, “If this operation is successful, I hope we can get the boys home for Christmas.” That expectation framed the advance as a final push. It also sharpened the reversal that followed: the offensive began on Friday, November 24, the day after Thanksgiving, and within four days its promise of a rapid conclusion had collapsed.

The Counterattack and Reversal

At 6:15 on the morning of November 28, General Bradley telephoned Truman at Blair House with what he called “a terrible message” from MacArthur. Later that morning, Truman briefed his staff at the White House. The Chinese had attacked with a force of 260,000 men, he told them, and MacArthur was going over to the defensive. Truman’s own blunt description—“The Chinese have come in with both feet”—conveyed the scale of the shock without disguising its strategic consequence.

The news contradicted the expectations built up since Inchon and at the recent meeting on Wake Island. Truman’s staff, among them Charlie Ross, Matt Connelly, Harry Vaughan, Charlie Murphy, Bill Hassett, and George Elsey, sat in silence as the implications became clear. John Hersey, present while preparing a profile of the President, later captured the burden of the moment: Truman would be answerable, “alone and inescapably,” for what happened next. The decision to advance beyond the 38th parallel had been his, just as the decision to attempt Inchon had been his; this time, however, the results were different.

The military reversal was also a reversal in the meaning of MacArthur’s offensive. Only three days after it began, MacArthur declared, “We face an entirely new war.” He said the Chinese were bent on the “complete destruction” of his army and that his command faced conditions beyond its control and strength. In subsequent messages he sought reinforcements on the “greatest magnitude,” including Chinese Nationalist troops from Formosa. He described his troops as mentally fatigued and physically battered, called the existing directives outmoded, and urged a naval blockade of China and bombing of the Chinese mainland. These demands made the counterattack a crisis not simply of retreat, but of whether the conflict would be widened to meet it.

Retreat in the Korean Winter

The broader battlefield picture deepened the shock. Newspaper accounts described Chinese forces moving through a widening gap in the Eighth Army’s right flank as the Allied offensive became a threat to the entire United Nations line. The Eighth Army was falling back. A New York Times headline the next day reported that 200,000 enemy troops had advanced as much as 23 miles in Korea. The figures and headlines conveyed the scale of the perceived emergency, while the cold and the intervention of Chinese forces brought together two dangers military planners had feared.

What followed was a retreat marked by some of the war’s worst fighting, through howling winds, snow, and temperatures as low as 25 degrees below zero. MacArthur’s separated forces were struck on their flanks. Walton Walker’s Eighth Army reeled back from the Chongchon River toward Pyongyang, facing a choice between retreat and annihilation. In the northeast, the U.S. Tenth Corps endured an even more severe ordeal. The 1st U.S. Marine Division withdrew from the Chosin Reservoir over forty miles to the port of Hungnam, where it was evacuated. The scale of that withdrawal invited comparisons with Xenophon’s retreat of the Ten Thousand and Napoleon’s retreat from Moscow. The advance that had been presented as a route home by Christmas had become a struggle to get the forces out.

Truman’s Choice and the Limits of War

On November 28, Truman’s first response was to absorb the news before deciding what could be announced. When asked whether the reported figure of 260,000 Chinese troops was accurate, he said it was; he agreed that nothing should yet be made public. The moment was painful for the staff and, by Truman’s account, the worst news he had received since becoming President. But he then sat upright and directed his attention to the work ahead: “We have got to meet this thing,” he said. “Let’s go ahead now and do our jobs as best we can.”

That afternoon, with Truman presiding, the National Security Council met in the Cabinet Room. Its decision was, in effect, not to allow the crisis in Korea to flare into a world war. The possibility of a wider conflict with the Soviet Union lay behind the immediate military emergency; the retreat and MacArthur’s requests for expanded authority therefore carried consequences beyond the peninsula. The council’s choice did not undo the battlefield disaster or remove the danger to the forces in retreat. It established a boundary around the response: the crisis would be met without turning defeat in Korea into a global war.

The offensive’s importance lies in the contrast between MacArthur’s confident forecast and the abrupt reality of November 28. It brought the Chinese counterattack, the winter retreat, and the question of escalation into a single political and military reckoning. Truman had already borne responsibility for crossing the 38th parallel; now he faced responsibility for how far the United States would go after the advance failed. The answer recorded here was not a sudden restoration of victory, but a decision to confront the emergency while resisting its expansion into a larger war.