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According to new research, an oft-told tale of early biological warfare a medieval siege involving the catapulting of victims of the Black Death probably never happened.

United kingdomUnited statesRalph payne gallweyMark wheelisVincentj derbesUniversity of californiaJournal of the american medical associationStockholm international peace research instituteProjectile throwing enginesAmerican medical associationEmerging infectiousYersinia pestis