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First recorded biological warfare was recorded in 1347 in Feodosiya, Crimea during the Mongol conquests. Mongols were holding Crimean city Feodosiya under the siege. Catapulting infected bodies and sometimes even live plague victims over the city walls. Some theories suggest that this plaque traveled through Crime trading routes into Italy. Thus infecting the whole Europe and reaching its peak in 1950s. The plaque was called the Black Death and accounts for Europe’s population decline by one third. There are death estimates of this pandemic that go as far as 200 million deaths in Europe in the years 1346–1353.