In addition to the organized destruction of some cities, he depopulated expansive areas of land by the laborious destruction of the irrigation system. Without irrigation, the villagers and farmers left, and the fields reverted to grazing land. This allowed large areas to be set aside for the herds that accompanied the army and were kept as reserves for future campaigns. Just as when he churned up the agricultural land when he left northern China to return to Mongolia, Genghis Khan always wanted a clear area of retreat or advancement where his army could always find adequate pasturage for the
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