Smell

1. Sludge

1.1. "we cursed through sludge"

2. Gunpowder

2.1. "Till on the haunting flares"

3. Trenches

3.1. World War I

4. Mustard Gas

4.1. "GAS! Gas!"

5. Dead Bodies

5.1. "And watch the white eyes writhing in his face"

6. Smoke

6.1. "coughing like hags"