U3: A world of woe

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Across
  1. 4. To enter a country or region with hostile intent.
  2. 6. The brutal killing of a large number of people.
  3. 8. A term for soldiers whose whereabouts are unknown.
  4. 9. To protect against attack or harm.
  5. 10. A person killed or injured in a war or accident.
  6. 12. The act of dropping explosive devices, often from aircraft, on a target.
  7. 14. A unit of soldiers typically commanded by a captain.
  8. 15. The infliction of severe physical or psychological pain as a means of punishment or coercion.
  9. 18. A person not in the military or police force.
  10. 20. To withdraw or move back, often as a military tactic.
  11. 21. To join the military voluntarily.
Down
  1. 1. A person who offers to do something without being forced
  2. 2. The opposite of victory; losing in a battle or war.
  3. 3. The use of toxic chemicals as weapons in a conflict.
  4. 5. Soldiers who fight on foot rather than in vehicles or aircraft.
  5. 7. A surprise attack by people lying in wait in a concealed position.
  6. 10. To strengthen and reinforce military positions or gains.
  7. 11. A rank in the army, typically below sergeant and above private.
  8. 13. A large military unit typically consisting of several companies.
  9. 16. Historical term for the psychological effects of intense combat.
  10. 17. A term used to denote soldiers who have died in combat.
  11. 19. paid to do it.