On duty!

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Across
  1. 2. extreme opinions and behavior
  2. 6. a police officer (esp. in France)
  3. 9. to prove sb guilty in a court of law
  4. 10. to gain or get sth usually by effort
  5. 13. keeping sb within limits (e.g.in prison)
  6. 16. carefully watching sb,to prevent a crime
  7. 17. to trade,exchange or replace (things)
  8. 19. without anyone or anything else
  9. 20. try to take control of a city,building etc.
Down
  1. 1. by means of sth, by using sth
  2. 3. a violent physical attack
  3. 4. secret information about an enemy
  4. 5. to reach the end or the final result of sth
  5. 7. a person who is captured (e.g. in a war)
  6. 8. parts of a city/town, far from the center
  7. 11. to remove (someone) from a dangerous place
  8. 12. lawyer trying to prove a person guilty
  9. 14. buildings in which soldiers live
  10. 15. not very important or serious
  11. 18. the state of being near