<P> Plague was reportedly first introduced to Europe via Genoese traders at the port city of Kaffa in the Crimea in 1347 . After a protracted siege, during which the Mongol army under Jani Beg was suffering from the disease, the army catapulted infected corpses over the city walls of Kaffa to infect the inhabitants . The Genoese traders fled, taking the plague by ship into Sicily and the south of Europe, whence it spread north . Whether or not this hypothesis is accurate, it is clear that several existing conditions such as war, famine, and weather contributed to the severity of the Black Death . </P> <P>... But at length it came to Gloucester, yea even to Oxford and to London, and finally it spread over all England and so wasted the people that scarce the tenth person of any sort was left alive . </P> <P> Geoffrey the Baker, Chronicon Angliae </P> <P> There appear to have been several introductions into Europe . The plague reached Sicily in October 1347, carried by twelve Genoese galleys, and rapidly spread all over the island . Galleys from Kaffa reached Genoa and Venice in January 1348, but it was the outbreak in Pisa a few weeks later that was the entry point to northern Italy . Towards the end of January, one of the galleys expelled from Italy arrived in Marseille . </P>

How did the black death spread from country to country