Japan’s Announcement of Surrender was the public culmination of Harry S. Truman’s wartime decisions about how to bring the conflict with Japan to an end. At 7:00 p.m. on August 14, 1945, Truman announced Japan’s surrender from his desk in the Oval Office; the same account also records his handwritten order to Secretary of War Stimson to use the atomic bomb against Japan, placing the announcement beside the grave decision that preceded it.

The secret project

The path to that announcement ran through a weapons program whose scale Truman initially knew only in outline. On June 17, 1943, he telephoned Stimson about investigators’ questions over unexplained expenditures for the Manhattan Project. Stimson told him it was a highly important secret development, known personally to only a handful of people. Truman accepted Stimson’s assurance that the expenditure served a specific and unique purpose and did not press him to disclose more. By July, however, Truman had learned the project’s essential nature.

A separate inquiry about enormous land condemnations along the Columbia River brought the secret closer to the surface. Nearly half a million acres were involved in the Hanford project, prompting Lewis Schwellenbach to ask Truman about the DuPont Company’s activity near the railroad town of Hanford. Truman replied on July 15, 1943, that Schwellenbach need not worry. The episode shows how the project’s secrecy was maintained even as its extraordinary physical and financial footprint generated questions.

Weighing invasion against other options

In 1945, the bomb was not the only course under consideration. Truman’s diary framed the choice as whether to invade Japan or instead bomb and blockade it, and described the decision as his hardest to date. At a White House meeting on June 18 to review invasion plans, the bomb was not mentioned. General George Marshall presented a two-phase invasion beginning in November with Kyushu, one of Japan’s southernmost islands. He expected the operation to be as difficult as Normandy and estimated that the first 30 days could bring losses comparable to those on Luzon, about 31,000.

Stimson continued to brief Truman as the decision approached. In Truman’s office, Stimson took a several-page memorandum from his briefcase and waited while the President read it. The memorandum warned that within four months the United States would probably have completed a weapon capable of destroying an entire city. It also stressed that the United States and Britain had shared in its development, while the United States alone could then produce it; Stimson judged that the Soviet Union might be able to enter production within the next few years. On July 24, Stimson again climbed to Truman’s office carrying a top-secret message.

The announcement

The account pairs the announcement with Truman’s handwritten order to Stimson to use the atomic bomb against Japan. It places the order and the public announcement together, but does not, in the passage describing the announcement, set out the intervening steps or claim that a single cause explains Japan’s surrender. The event’s firmly stated particulars are precise: Truman was at his desk in the Oval Office, and the announcement came at 7:00 p.m. on August 14, 1945.

The setting also recalls the Potsdam Conference, where Truman’s headquarters were at No. 2 Kaiserstrasse, the house the book calls a “nightmare” and identifies as the place where the decision on the atomic bomb was made. The contrast between that private headquarters and the Oval Office announcement marks a shift from secret deliberation to public declaration. The surrender announcement closes the immediate decision sequence with the end of the war made public, while the handwritten order preserves the weight of the choice that accompanied it.