World War I

3. This country had the largest ARMY at the start of the war
4. This country had the largest NAVY at the start of the war
7. A form of arms race where countries compete to build up their military forces
9. The name of a British passenger ship sunk by the Germans in 1915
12. The _______ Telegram, where Germany encouraged Mexico to attack the United States, finally drew the USA into WWI
14. An armored vehicle that could break through enemy defenses and protect soldiers from gunfire
15. Another word for a peace agreement; World War I ended with the signing of one on November 11
16. Wilhelm II, the ruler of Germany, was known as the _____

1. The act of acquiring large amounts of land and power under an empire
2. The longest battle of World War I was fought at ______ between Germany and France
5. A deadly type of poison gas that caused horrific injuries
6. When Archduke _____ Ferdinand was assassinated in Sarajevo in 1914, it sparked World War I
8. A system where countries agree to provide mutual military support for each other
10. In 1917, Germany declared it would resume unrestricted ________ warfare, meaning that it would sink all ships in English waters, regardless of the flag they flew
11. One of the main features of combat on the Western Front was the _____, a type of protective ditch
13. Nicholas II, the ruler of Russia, was known as the ____