World War One Weapons Quickquiz Show this content while the ad loads. 1. The bolt-action rifle could fire 15 rounds a minute. 2. Machine guns needed 4 - 6 men to work them. 3. Large field guns fired bullets. 4. Mustard gas is yellow in colour. 5. The Zeppelin was a German airship. 6. The first tank was used at the Battle of the Somme. 7. Planes were first used for spying work. 8. A fight between two planes is called a catfight. 9. German submarines torpedoed supply ships. 10. The Lusitania was torpedoed in 1915.