World War 1

4. a heavy armored Fighting Vehicle carrying guns
6. the ground-based equipment concerned with monitoring and controlling air traffic within a particular area
8. bullets for automatic weapons
9. poisonous gas used to kill enemies in Warfare
10. why are with clusters of short sharp spikes along it
11. a gun with a long spiral e grooved Barrel to make the bullet spin
12. a large German dirigible Airship
14. a weapon that sprays out burning fuel
15. an automatic gun that fires bullets in Rapid succession

1. the type of combat in which opposing troops fight from trenches facing each other
2. also known as gun synchronizer
3. a warship designed to operate completely submerged in the sea for long periods
5. large caliber guns used in Warfare on land
7. a powered flying vehicle with wings
13. watercraft that transports cargo or carries passengers for hire