| A | B |
| Armistice | Temporary end to war |
| flamethrower | weapon that shoots out burning fuel |
| espionage | spying to collect military secrets |
| Lusitania | British passenger liner |
| desertion | run away from duty without permission |
| infirmary | hospital |
| neutral | to take no side in war |
| front | a line of battle |
| Doughboy | nickname for American soldier |
| Allied | Countries that fought against Germany |
| bayonet | a knife attached to rifle muzzle |
| ace | World War I aviator |
| u-boat | German submarine |
| Kaiser | title given to the emperor of Germany |