Across
- 3. (american infantry rifle)
- 4. (longest battle fought in World War I)
- 5. (most commonly used gas in World War I)
- 7. (A term coined to describe the type of post traumatic stress disorder many soldiers were afflicted with during the war)
- 9. (Name of a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico)
- 12. (Location in Belgium where the fiercest battle of World War I was fought)
- 18. (The main theatre of war during World War I)
- 20. (ranged weapons that launch munitions far beyond the range and power of infantry firearms)
- 21. (German victory against Russia on the Eastern Front in 1914)
- 22. (A term used when soldiers had to climb out of their trenches to attack the enemy)
- 25. (German invention that was capable of firing a jet of flame out to a distance of 20 yards and was designed to be carried and operated by a single soldier)
Down
- 1. (british machine gun)
- 2. (vast system of defenses in northeastern France constructed by Germany in 1916–17)
- 6. (The area of land between two enemy trench systems, which neither side wished to cross or seize due to fear of being attacked by the enemy in the process)
- 8. (another German-made infantry rifle)
- 10. (british machine gun)
- 11. (one of the gasses used in World War I)
- 13. (the action or process of gradually reducing the strength or effectiveness of someone or something through sustained attack or pressure)
- 14. (German-made infantry rifle)
- 15. (A British ocean liner sunk by a German submarine in May 1915)
- 16. (deadliest gas used in World War I)
- 17. (The German term for a submarine)
- 19. (A type of combat in which opposing troops fight from trenches facing each other)
- 23. (failed attempt by Allies in 1915-16 to force the Dardanelles strait and occupy Constantinople)
- 24. (British military slang for German anti-aircraft fire)
- 26. (German adaptation of the Maxim)