A little 'factoid' I learned last night..Guruji explained to me about 'Moats'..The body of water that surrounds a castle..What I found out is the reason people didn't swim across the moat and attack the castle is because the moat was full of the remnants of the 'under-the-bed pots' that were thrown out from the castle windows, into the moat. That's one way to insure the castle wouldn't be attacked!
My friends son had this to add..They would use the catapult to send the bodies of those who had died of the plague into the enemies camp. This sounds like 'chemical warfare.'