Across
- 3. Ship was that sunk and caused US to come into the war
- 4. Invented to protect from deadly gas
- 7. This broke the lines and was used to go over stuff
- 8. Used in one-on-one fighting
- 10. The cause for countries to take sides
- 11. This was used in chemical warfare
- 12. When these exploded, metal fragments hit you
Down
- 1. Used to burn down towns during the war
- 2. The invention of this meant aerial combat
- 5. Used by both Britain and German for water war
- 6. Were many of the weapons inventions took place
- 9. Their army used a club with spikey things
- 11. Small explosives tossed by hand