Well, if ever there was anything worth napalming, then here it was. At least they could "spill" couple gallons of gasoline inside and then toss a cigarette butt. It is easy to double-guess from a distance, but this mode of proceeding would save at least one Marine.
FWIW, a lit cigarette butt will NOT ignite gasoline.
“House Guest” (Named by 2nd squad, 1st platoon, I Company) – Propane tanks placed in the central hallway with C-4 used to ignite it, creates a fuel air explosive – Used for bringing down a house when contact is made inside, propane tanks must be full
A 60 or 81 mm white phosphorous mortar round, wrapped three times with detonation cord and a 1/4 or 1/2 stick of C-4 – Used when contact is made in a house and the enemy must be burned out
Excellent idea. Let it linger a while to fume up good.