“Showers of balls from ten-inch Columbiads and forty-two-pounders, and shells from thirteen-inch mortars poured into the fort in one incessant stream, causing great flakes of masonry to fall in all directions,” Doubleday wrote. Mortar rounds became embedded in the soft ground of the parade. When these exploded, Doubleday wrote, the blasts “shook the fort like an earthquake.”
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