Let’s say you hold up inside a castle with walls that are thirty feet high. You have a garrison of about five hundred men armed with swords, shields, spears, longbows, crossbows, and ballistas. You also have enough food and provisions to last you six months. Now imagine a dragon the size of the castle itself flying overhead. The dragon has enough firepower to destroy the entire castle unless someone gets lucky and hits a weak spot in the dragon’s hide. What do you think you chances of survival would be?