It spread rapidly along trade routes and especially the Silk Road. It originated amongst the Mongols in Asia, who allowed their sacks of food to be exposed to rats and fleas that carried the fatal disease. Traders brought it with them into the Middle East, North Africa, and Europe. In four short years, 40 to 45% of the European population was lost to the plague, especially the poor. The Mongols amplified the problem by using catapults to toss plague-ridden bodies over city walls, a practice seen as the precursor to biological warfare. | It spread rapidly along trade routes and especially the Silk Road. It originated amongst the Mongols in Asia, who allowed their sacks of food to be exposed to rats and fleas that carried the fatal disease. Traders brought it with them into the Middle East, North Africa, and Europe. In four short years, 40 to 45% of the European population was lost to the plague, especially the poor. The Mongols amplified the problem by using catapults to toss plague-ridden bodies over city walls, a practice seen as the precursor to biological warfare. |