Mustard Gas - The terror of the trenches in World War I, mustard gas gets its name from its yellow-brown color and its odor, which is apparently similar to horseradish. Because it's heavier than air, mustard gas proved particularly effective in clearing trenches, and was almost single-handedly responsible for the 1928 Geneva Conventions. When inhaled, the gas causes the lungs to fill with fluid, essentially drowning the victim in their own fluids.
And that's where you're wrong!
A dead soldier is left there for later pick up.
A wounded soldier imediatly takes 1-2 of his buddies to carry him to safety, wham 3 soldiers less with one bullet.
Remember: There are many kinds of wounded but only one kind of dead.
#16
Toxin, think greek for bow.
They lased their arrows with poop and decaying bodies way back then, nothing new.