Trenton and Duncan
You walk down the mucky and bloody trench...it's quiet, the artillery fire has gone almost completely quiet and very few bullets are being shot. You see allies jumping into the trenches a little farther ahead and sprinting about, apparently executing fallen enemies. It's peaceful...maybe you've finally won the fight?
And then a dreadful yell of terror breaks the peaceful tension
"BloodGas! Everyone! BloodGas! Fall back!
You've only ever heard stories of the Maxim BloodGas, you see it sweep through the trenches, a smoky red gas with extreme lethality. The men ahead of you begin to put on gasmasks and tuck their sleeves and clothing, apparently attempting to leave no skin exposed. The other soldiers up ahead attempt to sprint away...but the gas leaps forward at such a rapid speed that they have no chance. You watch as they make deep suctioning breaths and blood pours out of their mouths, they collapse as their skin is eaten away leaving a gory mess.
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Hans
You look farther down the trenchline and notice a peculiar red gas flow throughout the trenches, men appear to be running away from it...this is the infamous BloodGas that all recruits are told of.