How Did The Iranians Expel The Mongols From Iran?

  The Mongols killed many Iranian civilians. Destruction of qanat irrigation systems destroyed the pattern of relatively continuous settlement, producing numerous isolated oasis cities in a land where they had previously been rare. A large number of people, particularly males, were killed; between 1220 and 1258, 90% of the total population of Iran may have been killed as a result of mass extermination and famine.