MacArthur remained confident the next day that the situation was in hand and somewhat
reluctantly agreed with the U.S. ambassador in Seoul, John J. Muccio, that American women and
children in Korea should be evacuated. During the day the South Korean Army retreated, and
soon its line began to disintegrate.[7] On the following day, June 27,
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when Dulles was to board his plane for the return trip to Washington, he found MacArthur no
longer the "jaunty, confident" commander of Sunday evening but a "dejected, completely
despondent man." The general was even heard to say, "All Korea is lost." Dulles and Allison
were dismayed by MacArthur's sudden loss of confidence. It was behavior of this kind that later
caused Dulles to characterize the general as "high-strung."[8]
What MacArthur termed a "reconnaissance in force" by North Korea turned out to be a massive
invasion. On June 27 President Truman authorized the use of U.S. air and naval forces to assist
the ROK in combating the invasion. On June 30, in response to MacArthur's recommendation, he
authorized the use of U.S. ground forces, and soon all four of the army divisions in Japan, more
than 80,000 men, were transferred to Korea.
Planning by U.S. military experts had previously made no provision for action by the United
States to defend South Korea in the event of an invasion by the North or other communist forces.
Yet when the North Koreans invaded, and the ROK Army could not check them, the United
States intervened. MacArthur and Dulles almost took it for granted that the United States should
act to meet an "unprovoked, armed attack" on a friendly state. Little evidence can be adduced to
show that they thought the security of Japan was a prime reason for the United States to move in,
although officials in Washington did give thought to Japan's security in making their decision to
send in U.S. forces. At a tense White House meeting soon after the invasion, Admiral Forrest
Sherman, the chief of naval operations, mentioned "the strategic threat" to Japan, and Dean
Acheson later reiterated this theme. Dulles, an eager student of Kremlinology, insisted that the
North Koreans "did not do this purely on their own but as part of the world strategy of
international communism."[9]
On June 25, 1950, the U.N. Security Council unanimously approved a resolution—the Soviets
boycotted the meeting—condemning the aggression against South Korea; soon afterward it
authorized the creation of a U.N. force under U.S. command to put down the invasion. In the
summer of 1950 the U.N. forces were almost pushed out of the peninsula, but after a brilliant
amphibious landing masterminded by General MacArthur at Inchon near Seoul, they swept north
to the Yalu River, only to be hammered back to central Korea when large numbers of Chinese
"volunteers" entered the fighting in November. Inside three months, Douglas MacArthur had
won his most brilliant victory and
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suffered his most crushing defeat in a military career spanning a half century.
MacArthur told President Truman when they met at Wake Island in October 1950 that the
Chinese communists would not intervene in Korea. But the general was not a good judge of the
Chinese. Like many Americans of that era, he minimized the ability of the Chinese communists
to conduct modern warfare; in September 1949 he told a congressional subcommittee that "their
forces are grossly overrated." He stuck to the view that the Chinese Nationalists would have been
a valuable asset with which to counter the communists, despite the record of Nationalist failure
on the mainland. MacArthur was also an unabashed believer in air power and thought to the end
that air strikes on Manchuria would destroy communist ability to carry on the war.[10]