Khan slung a number of things in order to destroy the walls of the fortified bases this included stones, boulders, dead animals, dead ridden corpses of the enemy soldiers, even dung was thrown across the walls in order to ensure a discomfort and distress in the people who were inside the town walls. These events soon were spread throughout all of Europe this practice of using a siege weapon against enemies become common in most battles fought in Eastern hemisphere. For the most part biological warfare was not used through the medieval times since the bubonic plague was spreading in Europe this event caused most of the fighting to stop for a short amount of