The Bombing of Nagasaki

Council on Foreign Relations  |  James M. Lindsay

On August 6, 1945, the United States dropped the Little Boy atomic bomb on Hiroshima, killing 140,000 people, followed three days later by the Fat Man detonation over Nagasaki, which killed an immediate 40,000 civilians. President Harry S. Truman authorized the strikes following recommendations from the Interim Committee and Japan's rejection of the Potsdam Declaration.

Operational planners accelerated the Nagasaki attack from August 11 to August 9 due to weather forecasts, diverting a B-29 bomber from Kokura when clouds obscured the primary target. Concurrently, the Soviet Union declared war on August 8, shattering Tokyo's hopes for a mediated peace and leading Emperor Hirohito to break a cabinet deadlock in favor of surrender. Historians argue that this compressed three-day window denied Japanese leaders adequate time to assess nuclear devastation and formulate a diplomatic response. Truman halted further atomic operations on August 10, terminating the campaign as Japan surrendered.

Comment

The delegation of nuclear release authority during the 1945 Marianas campaign revealed an operational friction between theatre meteorological timelines and executive oversight. By permitting field commanders to advance the Fat Man strike from August 11 to August 9 based on local weather windows, targeting authority was exercised without real-time re-authorisation from Washington. General George C. Marshall's subsequent written directive requiring explicit presidential approval for subsequent atomic drops marked a rapid recasting of American nuclear command structures. This pivot established the precedent of strict civilian negative control over strategic nuclear armaments.

Strategic Question for Discussion

Which factor proved more decisive in establishing enduring Western nuclear command protocols — the battlefield autonomy exercised during the Fat Man mission, or General George C. Marshall's August 10 mandate asserting presidential release authority?

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