That's not how it happened. Because the Mongols at that time period had turned to Islam and basically shut the Christians off from the Silk Road. And that basically occurred in Crimea, that was the border. And in Crimea you still had some Italian tradesmen and they were holed up in a city called Kaffa. And basically what occurred was as the Mongols were affected with the plague, with bubonic plague, and they couldn't do the siege anymore, they started tossing the dead bodies over the wall. It's probably the first instance of biological warfare in human history. But then these Italian tradesmen, these sailors, they got infected and at the same time they're trying to get the heck out of Dodge.