World War I

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Across
  1. 4. The last name of the assassinated Arch Duke
  2. 7. Gas weapon used to burn the lung of those in the trenches
  3. 8. Large metal vehicles that changed trench warfare
  4. 10. Taking to the skies these were now weapons of war
  5. 11. Germany, Austria-Hungary, and the Ottomans
Down
  1. 1. The assassins who started the war were from here
  2. 2. Britain, France and Russia
  3. 3. A battle between French and German forces, claimed 300,000 lives
  4. 5. The area in between two fronts of a battlefield
  5. 6. A failed invasion by Britain into the Ottoman Empire
  6. 8. The dug out lines, where soldiers spent their time defending
  7. 9. Battle between the British and the Germans, the first day climaed 57,000 lives