First world war vocabulary

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Across
  1. 5. countries that cooperate or help each other
  2. 7. lines dug in the ground to give protection from enemy fire
  3. 8. people not in an army
  4. 9. murdered for political or religious reasons
Down
  1. 1. people in an army
  2. 2. a formal agreement between countries
  3. 3. places where fighing occurred
  4. 4. countries or areas under the control of another country
  5. 6. the armed forces of a country