Well, you know, I wouldn't say that! Honestly... The Castle will win against the Tower mainly due to faster development in the early game – but if you do it the way you suggest – 20th level against 20th level, with troops for the same number of weeks – then it's far from certain that the Knight will win, believe me!!! You can cast a very powerful spell – like berserk half of your army – and what will you do? Go make a great explosion, a meteor shower, a chain lightning spell :D And just something massive, like a slowing spell – and successfully shoot down all the Knight's army! Archdevils are, of course, strong creatures, but there are ways to deal with them – Nagas, for example ;) In general, your attack/defense won't help either :) Besides, you can reduce these parameters with spells ;) And in general, in fact, everything depends on the player who controls the army. It really all depends on him!