Weapon yield for the 280-mm shell (that's an 11-incher, btw, same caliber as the German pocket battleships and the two battlecruisers in WW II), was 15 KT. The movie Trinity and Beyond: The Atomic Bomb Movie has the test shot included. Note that this is the same movie that at the end has the first Chinese test, with cheering crowds hollering at the sight of the fireball and cloud, and horse cavalry in NBC suits (yes, the horses had MOPP suits and masks) charging ground zero-even waving cavalry sabers as they did so.
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Treat everyone you meet with kindness and respect, but always have a plan to kill them.
Old USMC Adage
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