In reference to the Summit map:
Playing solo and rushing back and forth from repairing my defenses to manning the appropriate ballistae is a bit more hectic than I'd like, but playing with friends increases the health of the dragon to such high levels that the battle is more of a long drawn-out war of tedium than it is fun and rewarding. As the apprentice, I generally wind up running around from tower to tower repairing rather than engaging the dragon, making the process even more arduous.
Is there any way I can place towers around the outside edge of the castle to shorten the length of the battle? If I build some apprentice towers on the edge of the castle, facing outward, will they hit the dragon as he flies past? Does it depend on range? Does it depend on missile speed?