Live through WW1

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Across
  1. 3. one of the Central Powers
  2. 5. land boat
  3. 6. yellow gas
  4. 8. the two main coalitions that fought in World War I
Down
  1. 1. paint, nets, or foliage.
  2. 2. an act of war whereby one party blocks entry to or departure
  3. 4. attack of the dead men
  4. 5. soldiers or armed forces
  5. 7. post-traumatic stress disorder
  6. 9. hole in the ground