Across
- 1. Soldiers personal equipment that protected against breathing poison gas
- 4. Large guns capable of firing shells over a long range, causing widespread destruction and casualties
- 5. Common fighting style during WWI, involving soldiers fighting from dug-out ditches
- 8. Viewing enemy position, weapons, movement from airplane cameras or observation
- 11. Naval vessels that travel below the surface, used for attacking enemy ships and disrupting supply lines
- 15. Peace agreement signed in June 1919 that officially ended World War I
- 16. Safe way to expand a trench that allows construction to be protected from enemy weapons
- 17. Explosives used to destroy submarines
Down
- 2. Includes motorized ambulances, reconnaissance vehicles, troop transports, and other vehicles for transportation
- 3. Highly effective, rapid-fire weapons, causing a significant number of casualties on the battlefield
- 6. Used for wireless communication, allowing for faster and more accurate transmission of messages than previous methods
- 7. Weapons that sprayed burning fuel, used to neutralize enemy soldiers in trenches and bunkers
- 9. Techniques used to disguise military equipment and personnel
- 10. Double-winged flying vehicles used for reconnaissance and, later, for bombing and air combat
- 12. Laying down weapons to stop fighting and begin negotiating peace
- 13. Chemical weapons used to inflict injuries and deaths on enemy soldiers fighting in trenches
- 14. Digging down from the surface of the ground to create a defensive ditch
- 18. Armored vehicles used for combat, initially called "landships"