World war one

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Across
  1. 4. Western Europe where the fighting was fought
  2. 6. British Empire, Russia, France and more
  3. 8. Tunnels that the war was fought in
  4. 9. Another wood for troops
Down
  1. 1. German Submarines
  2. 2. A very powerful boat
  3. 3. Large, Heavy guns used for land warfare
  4. 5. Army used for naval warfare
  5. 7. An agreement between both sides to stop the war