Its the old equal and opposite reaction thing. The force necessary to push a mortar bomb out 3-4,000 meters results in the baseplate being punched in to the ground.
I've witnessed the results of a 4.2-inch mortar crew firing a chain of 30 bombs...and then requiring the crew about an hour of digging to recover the baseplate when everything was finished.
Thoses decks are thin, unless there is major reinforcement, it would not take a large number of rounds to starting bending the plates!
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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