WW1 Cross Word Puzzle

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Across
  1. 3. A river near Paris
  2. 5. Austro ruler
  3. 6. Willing to do anything for your country
  4. 7. Military preparedness
  5. 9. Luxury passenger ship
  6. 10. Submarine
Down
  1. 1. Big metal cars used for warfare
  2. 2. Corrupt way of ruling
  3. 4. Teenager affiliated with The Black Hand
  4. 8. Digging in the ground fighting