The First World War

1. The killing of Archduke Franz Ferdinand of Austria-Hungary, which sparked the war.
8. Large-caliber guns used to bombard enemy positions from a distance.
10. Agreements between nations to provide mutual support in case of conflict.
11. A form of combat where soldiers dug trenches for protection from enemy fire.
13. A pre-war alliance between France, Russia, and Britain.
14. A policy in which a country seeks to extend its authority by conquering other territories.
15. A chemical weapon first used in WWI that caused blindness, blisters, and death.

2. A pre-war military alliance between Germany, Austria-Hungary, and Italy.
3. The policy of building up strong armed forces to prepare for war.
4. A war involving the complete mobilization of a nation’s resources and people.
5. A rapid-fire weapon used extensively during WWI.
6. A strong sense of pride and loyalty to one’s nation, often leading to competition and conflict.
7. Armored vehicles introduced during WWI to break through enemy lines.
9. German submarines that targeted Allied ships, including merchant vessels.
12. The dangerous, barren land between opposing trenches.