^^^
the mongoles had a lot of help from Chinese engineers in siege warfare later on. you dont belive me, ask the last Caliph of the Abbassides who was rolled into a carpet while the entire horde passed over and trumpled it 
.... therefore, if we are comparing Imperial rome, then we must compare it with Imperial Mongolia, in a sense that we should consider the entire Mongole host with their vassals and subjects .... including the Chinese seige engineers
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If we contrast the rapid progress of this mischievous discovery of gunpowder with the slow and laborious advances of reason, science, and the arts of peace, a philosopher, according to his temper, will laugh or weep at the folly of mankind. - Edward Gibbon
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