World War 1

3. An encounter between opposing forces
4. a member of an army
7. Done or undertaken of one's own free will
8. A soldier from Australia in World War I and World War II.
10. Retreat of a military force in the face of enemy attack or after a defeat
11. A political unit having an extensive territory or comprising a number of territories or nations and ruled by a single supreme authority.
13. A group of soldiers.
14. To engage a person for service in the armed forces

1. A long narrow ditch embanked with its own soil and used for concealment and protection in warfare.
2. the condition of being captive; imprisonment
5. An accident, especially one involving serious injury or loss of life
6. compulsory enrolment
9. a narrow peninsula of northwest Turkey
12. a prisoner of war