Across
- 3. A German submarine.
- 5. Britain was part of the Triple ________
- 8. Attacked by Austria-Hungary at the start of WWI.
- 9. The Russian Tsar at the start of WWI.
- 10. The German Kaiser at the start of WWI.
Down
- 1. A deadly gas.
- 2. France's ally.
- 4. Germany invaded France through this country.
- 6. An armored vehicle.
- 7. Soldiers hid there for safety.