Across
- 2. Evolved from reconnaissance to bombing and dogfighting.
- 4. Protection from chemical attacks.
- 7. Naval warfare, disrupting supply lines.
- 8. For shooting from trenches.
- 9. Revolutionized infantry combat, leading to trench warfare.
Down
- 1. More sophisticated indirect fire methods.
- 3. Introduced to break trench stalemate, armoured vehicles.
- 5. Medical innovations for wounded soldiers.
- 6. Communication between ships and ground forces.
- 8. Chlorine, mustard gas used to clear trenches.