all clues to this event!

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Across
  1. 3. animal native to the local river
  2. 4. caliphate
  3. 5. river valley
  4. 7. brother of Möngke
  5. 8. country in the Middle East
  6. 9. a Mongol group
Down
  1. 1. the only river that goes rawrrrrr
  2. 2. House of Islam
  3. 6. days it lasted