QUOTE (bigruss22 @ Jul 25, 2017 -> 08:37 AM)
The show has made it a point to have the dragons stay in one place while breathing fire (not all the time but frequently), my guess is during one of those times an arrow from one of the crossbows will hit them. Gotta remember, no one has battled with a dragon in hundreds of years, tactics to protect them and avoid such defenses aren't really known at this point.
They should just dunk a random person in poison and leave him out for the dragons to eat.