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What dragons are you talking about? Are you kidding me? :D From the troops, you need snipers and cavalry. From Necropolis, get as many upgraded vampires as possible, who, along with Tazar, can take out the entire garrison if you strategically position your troops. I don't know if it's possible to level up Tazar to the point where he can act as a tank... but I think it's a viable idea. I think if players of Dmitry AS's level were playing, the garrison would likely fall.