Oranges in no man's land

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Across
  1. 2. bombardment by shells.
  2. 4. having been deserted or left.
  3. 9. a member of a militia.
  4. 10. a person who unlawfully occupies an uninhabited building or unused land.
  5. 11. supply of bullets and shells.
Down
  1. 1. a barrier where security checks are carried out.
  2. 3. in very poor condition due to neglect.
  3. 5. wire of clusters of short sharp spikes.
  4. 6. a war between citizens of the same country.
  5. 7. unclaimed piece of ground between two armies.
  6. 8. someone who is forced out of their country.
  7. 12. harsh and difficult to live in.