Work in May

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Across
  1. 2. official title of Franz Ferdinand
  2. 6. weapons packed with explosives
  3. 9. empire now officially Turkey
  4. 11. to go back
  5. 12. a secret message using numbers or symbols
  6. 13. contract signed by countries to help each other in the war
  7. 14. happy chords in music
Down
  1. 1. gaining control of a situation
  2. 3. going up to heaven
  3. 4. 700,000 casualties during this battle
  4. 5. act of intentionally killing someone
  5. 7. type of fighting e.g. trench, naval
  6. 8. a starting point for writing
  7. 10. dug by soldiers for battle
  8. 15. day to celebrate soldiers from AUS and NZ