world-war crossword

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Across
  1. 3. a hero of world war 1, originally a conscientious objector
  2. 4. soldiers impressed by cities, but shocked by battle
  3. 5. group consisting of France,the United Kingdom, Russia, the United States, Italy, and Japan
  4. 8. extending a country's power to another country
  5. 11. formal declarations non aggressions between countries
  6. 12. german name for a submarine
  7. 14. group consisting of Germany, Austria-Hungary, Bulgaria and the Ottoman Empire
  8. 17. exploring an area to gather information
  9. 18. destroyers escorting merchant ships
  10. 19. a country maintaining a strong military
  11. 20. armoured ground fighting vehicle
Down
  1. 1. a fully automatic firearm made for sustained fire
  2. 2. a person who rejects the war on moral grounds
  3. 6. preparation of soldiers based on possible situations
  4. 7. explosive devices contained underwater to prevent enemy passage
  5. 9. an airborn vehicle meant for transport and/or fighting
  6. 10. support of ones own country or nation
  7. 13. compulsory recruitment for the military
  8. 15. military commander of an army
  9. 16. close combat between opposing aircraft