World War 1 Crossword Puzzle

1. A German submarine.
4. An un-limited use of a country's power in order to attack and destroy another country's forces.
5. A system where all property is owned by the community and only receives according to their needs.
9. Ended the state of war between Germany and the Allied Powers.
11. A dirigible airship of the early 20th century, long and cylindrical in shape and with a rigid framework.
13. A heavy warship with extensive armor protection and large-calibre guns.
15. A union or association formed for mutual benefit.
16. An aircraft without moving wings carried by and engine and a propeller.
17. Poisonous gas or vapor, used especially to disable an enemy in warfare.
19. A long, narrow ditch.

2. A self-propelled underwater missile designed to be fired from a ship or submarine.
3. Large-calibre guns used in warfare on land.
6. The belief that a country should have strong military capability.
7. Information used to promote a political cause or point of view.
8. Was the understanding linking Russia, France, and Great Britain.
10. A system which advocates that the means of production, distribution, and exchange should be owned.
12. A position counting as a draw.
14. A protective mask used to cover a person's face as a defense against poison gas.
18. A person who serves in an army.
19. A heavy armored fighting vehicle carrying guns.