Expect a rain of ruin from the air …

   … the like of which has never been seen on this earth.

Related source » Atomic bombings of Hiroshima and Nagasaki
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“If they do not now accept our terms, they may expect a rain of ruin from the air, the like of which has never been seen on this earth. Behind this air attack will follow sea and land forces in such numbers and power as they have not yet seen and with the fighting skill of which they are already well aware.”

— Statement by President Truman, Announcing the A-Bomb at Hiroshima (August 6, 1945).

Atomic bomb mushroom cloud over Hiroshima

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