What happened
On 6 August 1945, the United States dropped a uranium bomb named ‘Little Boy’ on Hiroshima. On 9 August, it dropped a plutonium bomb named ‘Fat Man’ on Nagasaki. Both were delivered by Silverplate B-29s of the 509th Composite Group from Tinian. The bombings killed 150,000–246,000 people, most civilians, over two to four months.
How we know it
The event is documented in official military records, target selection memos, and post-bombing casualty surveys cited in the source material. The dates, units, aircraft types, bomb names, and casualty ranges appear in the verified claims. No other sources are referenced or implied.
Why it went that way
Target selection prioritised large urban areas with military facilities—Hiroshima, Kokura, Niigata, and Nagasaki—and required UK consent under the Quebec Agreement. Orders dated 25 July authorised use. The 509th Composite Group had been trained and deployed specifically for this mission. No alternative plans, dissenting voices, or operational delays are cited.
What is still contested
The source does not state Japan’s surrender was caused solely—or even primarily—by the bombings. It reports only that the bombings ‘precipitated’ surrender on 15 August. No motive, decision-making process, or internal Japanese deliberation is given. The role of Soviet entry into the war on 8 August, blockade effects, or prior peace feelers is not mentioned and therefore cannot be assessed from this material.
What it changed
The bombings established nuclear weapons as instruments of strategic warfare—not just experimental devices. They triggered immediate arms control efforts (e.g., the Quebec Agreement’s UK consent) and set a precedent for civilian targeting at scale using weapons whose effects extended far beyond blast and fire. They did not establish a norm against use: they established the fact of use.
Is it worth your time
Yes. It is the only wartime use of nuclear weapons. Its consequences—military, ethical, and geopolitical—are still active in treaty negotiations, disarmament debates, and survivor advocacy. Understanding it requires confronting how evidence, authority, and silence shape historical memory.
