Behind Enemy Lines

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Across
  1. 3. Weapon designed to explode on impact.
  2. 4. A high-ranking officer in the army.
  3. 6. An underwater boat.
  4. 8. A person who has formerly served in the armed forces.
  5. 11. Initiating country of the war.
  6. 12. A sudden, violent military move.
Down
  1. 1. A system of rules to convert information.
  2. 2. A tool of war that influences public opinion and supports war efforts.
  3. 4. Soldiers carried a ___ mask for protection.
  4. 5. A military plane.
  5. 7. The main fighting force on land.
  6. 9. A heavy armored vehicle with a big gun.
  7. 10. The main fighting force on the sea.
  8. 11. Weapon used to fire projectiles.