The Artillery and Chemical Warfare

Back in medieval times they had large artillery but not to many variations. the main one used was the trebuchet ( I will show a picture below ) was used to launch boulders at the enemies castle. But that wasn't all they would launch. you see as people got smarter they created things like flaming balls of sticks to launch or they would take the carcasses of the dead whether it be human or animal and they would fling them over the walls to spread the disease. This was their version of chemical warfare and it was somewhat effective. I'm unsure but they also may have had large bombs that they flung over as well.