#7. Win sieges with engineering
Afortified City gave Genghis Khan with a completely new battlefield challenge. If an adversary had enough supplies in its castle, he might remain hidden behind rising fights for a longer period of time. Genghis Khan could not feel safe in the land he invaded till such a stronghold was defeated. So, what exactly did he do? What exactly is the big deal?

#7. Win Sieges With Engineering
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