Word wizard puzzle

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Across
  1. 2. children who were sent away for their safety
  2. 5. countries who join forces in war
  3. 7. muscular walled tubes that transport blood from the heart
  4. 9. when countries or large groups use weapons to fight each other
Down
  1. 1. activity requiring physical effort
  2. 3. opposing countries in a war
  3. 4. a hollow muscular organ that pumps the blood through the circulatory system
  4. 6. tubes forming part of the blood circulation system of the body
  5. 8. royal air force