Across
- 4. Treaty that ended Russia's participation in World War I.
- 7. Long, deep ditch used in warfare to shelter from enemy fire.
- 8. Type of warfare that introduced the use of gases.
- 10. Last name of the Russian leader who led the Bolshevik Revolution.
Down
- 1. He was the Emperor of Germany during World War I.
- 2. The major event that sparked the beginning of World War I, the assassination of Archduke Franz _________.
- 3. This type of machine changed warfare, making traditional battle tactics obsolete.
- 5. Alliance including Germany, Austria-Hungary, and Italy initially.
- 6. This empire's weakening was a significant prelude to the war.
- 9. Country that switched from the Triple Alliance to the Triple Entente at the start of the war.