Across
- 1. Germany submarine warfare
- 3. ship sunk by germany
- 4. declared war on Russia
- 9. deep love for your country
- 12. russia,great britain, and france
- 14. helium-filled weapon
- 15. building up soldiers and military
- 20. German U-Boat
Down
- 2. blamed germany for wwi
- 5. germany sent this to mexico
- 6. agreement to protect each other
- 7. declared war on Germany
- 8. president of the united states
- 10. disease caused by standing in water
- 11. trench warfare front
- 13. assassinator from serbia
- 16. take over a country for natural resources
- 17. agreement to stop war
- 18. country that switched sides
- 19. type of poisonous gas