Military concepts and more

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Across
  1. 2. City captured by Muslims in Syria
  2. 4. Sector reformed by Umar in conquered lands
  3. 6. Organized fighting force under Umar
  4. 8. Fort in Egypt captured by Amr bin Al-Aas
  5. 9. Natural event aiding Muslims at Yarmouk
Down
  1. 1. Early battle victory in Syria
  2. 3. Military town or post
  3. 5. River near battles in Iraq
  4. 7. Key principle of Umar’s administration
  5. 10. Religious and educational institution