World War One Terms!

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Across
  1. 5. One country joining with another.
  2. 6. The murder of a very important person.
  3. 9. A place for soldiers to have food and water.
  4. 10. A place where military commanders do their duties.
  5. 12. A badge of honour.
Down
  1. 1. A killer that is well hidden.
  2. 2. The agreement that ended hostilities in WW1.
  3. 3. A weapon placed at the end of another weapon.
  4. 4. The suspension of hostilities.
  5. 7. One country ruling many others.
  6. 8. A long, deep and narrow hole in the ground used for protection.
  7. 11. A unit of soldiers.