[Sorry for the late posting, just been busy.]
Trenton
You curl into a ball as the red gas envelops you, you're pretty well protected but you still feel minor stings here and there as small bits seep through. It's a good thing your mask was on when this hit or you could have easily become a melted figment.
Hans
You flick on your gasmask rapidly as the gas rapidly approaches you, it speeds past and to your position with an extreme speed, it snaps away at your exposed hands and you feel a warm and wet liquid...the feeling of blood as it wraps around and tears away skin. If you don't protect your hands soon...you may lose them permanently.
Thankfully due to your small size, your clothing protects the rest of your body extraordinarily well.
Duncan
You don your gasmask and gloves rapidly as the gas envelops you. Thanks to your rational thinking you were able to make a small checklist of your body parts and made sure that you were safely protected. You then re-draw your pistols and wait for anything else to happen.
Everyone
Farther into the reddish cloud you hear the gurgling and thudding of your comrades, very few of your allies in the 112th have survived up to this point...a rough estimate would be about thirty. The trench you are currently in seems to go in a fairly straight line for as far as the eye can see...which is practically nothing considering the gas blocks most of your vision.