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Oppenheimer and the Legacy of His Bomb · Aug 2, 2026

Countdown to Hiroshima: Four Days Away

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Greg Mitchell · Oppenheimer and the Legacy of His Bomb

Every year at this time I trace the final days leading to the first use of the atomic bomb against two cities, Hiroshima and Nagasaki, in August 1945, with close up probes of individual days. In this way the fateful, and in my view, tragic decisions made by President Truman, his advisers, and others, can be judged more clearly in “real time.” As some know, this is a subject that I have explored in hundreds of articles, and in four books (including one with Robert Jay Lifton) since 1984, and now in my award-winning PBS films “Atomic Cover-up” and “The Atomic Bowl” and soon to arrive “Hollywood Bomb,” plus companion books. You can still subscrtibe free:

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—Truman wrote a letter to his wife Bess last night talking about the atomic bomb (but without revealing it): “He [Stalin] doesn’t know it but I have an ace in the hole and another one showing—so unless he has threes or two pair (and I know he has not) we are sitting all right.”

And today he gives a letter to Stalin, which confounds the Soviet leader. Earlier, Stalin had promised to declare war on Japan around August 10. Now Truman writes that more consultation is needed. Truman had earlier pushed for the quick entry, writing in his diary "fini Japs" when that occurred, even without use of The Bomb. Now that he has the bomb in his "pocket" he apparently hopes to stall the Soviets.

--Truman has also approved statement on the use of the bomb, brought to him last night in Germany by a courier, drafted by Secretary of War Stimson and others, and ordered it released after the bomb drop. A line near the start has been added explicitly depicting the vast city of Hiroshima (occupied mainly by women and children) as nothing but a “military base.” The president, and the drafters of the statement, knew was false. An earlier draft described the city of Nagasaki as a “naval base” and nothing more. There would be no reference to radiation effects whatsoever in the statement—it was just a vastly bigger bomb.

—The “Little Boy” atomic bomb is now ready for use on the island of Tinian. Under the direction of the lead pilot, Paul Tibbetts, practice runs have been completed, near Iwo Jima, and fake payloads dropped, with success. Truman’s order had given the okay for the first mission later this day and it might have happened if a typhoon was not approaching Japan. Taking off the night of August 5 appears most likely scenario.

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—Paul Tibbets, pilot of the lead plane, the Enola Gay (named after his mom) on the first mission, reported to Gen. Curtis LeMay’s Air Force headquartters on Guam. LeMay told him the “primary” was still Hiroshima. Bombardier Thomas Ferebee pointed on a map what the aiming point for the bomb would be—a distinctive T-shaped bridge in the center of the city, not the local army base. “It’s the most perfect aiming I’ve seen in the whole damned war,” Tibbets said. But the main idea was to set the bomb off over the center of the city, which rests in kind of a bowl, so that the surrounding hills would supply a “focusing effect” that would lead to added destruction and loss of life in city mainly filled by women and children.

--On board the ship Augusta steaming home for USA after Potsdam meeting, President Truman, Joint Chiefs chairman Admiral Leahy, and Secretary of State James F. Byrnes--a strong A-bomb booster--enjoy some poker. Byrnes aide Walter Brown notes in his diary that “President, Leahy, JFB Byrnes agreed Japan looking for peace. (Leahy had another report from Pacific.) President afraid they will sue for peace through Russia instead of some country like Sweden.”

--Leahy had questioned the decision to use the bomb, later writing: “[T]he use of this barbarous weapon at Hiroshima and Nagasaki was of no material assistance in our war against Japan. The Japanese were already defeated and ready to surrender.... [I]n being the first to use it, we...adopted an ethical standard common to the barbarians of the Dark Ages. I was not taught to make war in that fashion, and wars cannot be won by destroying women and children.”

--Our “Magic” intercepts show Japan monitoring the Soviets’ military buildup in the Far East (prelude to the declaration of war in four days). Also, Japanese still searching for way to approach Molotov to pursue possible surrender terms before that happens. Another Magic intercept carried the heading, “Japanese Army’s interest in peace negotiations.” War Department intel analysts revealed “the first statement to appear in the traffic that the Japanese Army is interested in the effort to end the war with Soviet assistance.” A segment of Prime Minister Togo’s message declared: “The Premier and the leaders of the Army are now concentrating all their attention on this one point.”

--John McCloy, then assistant secretary of war and a well-known “hawk” in his later career, would later reflect,

“I have always felt that if, in our ultimatum to the Japanese government issued from Potsdam [in July 1945], we had referred to the retention of the emperor as a constitutional monarch and had made some reference to the reasonable accessibility of raw materials to the future Japanese government, it would have been accepted. Indeed, I believe that even in the form it was delivered, there was some disposition on the part of the Japanese to give it favorable consideration.

“When the war was over I arrived at this conclusion after talking with a number of Japanese officials who had been closely associated with the decision of the then Japanese government, to reject the ultimatum, as it was presented. I believe we missed the opportunity of effecting a Japanese surrender, completely satisfactory to us, without the necessity of dropping the bombs.”

--Soviet General Vasilevskii reports to Stalin that Soviet forces ready for invasion from August 7 on.

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