To clarify, the two shells were detonated on the ground in an open field bordered by some trees and burned-down buildings, about 500m north of a small hamlet where the PCs are engaged in some house-clearing. The hamlet is surrounded by woods. The Vistula river flows by about a kilometer to the west.
I wish I'd asked this question earlier. I was operating under a couple of assumptions and the hope that the players would suspend disbelief, to a degree. With what Jester said about having the shells having to spin to mix the chemical components, I guess the best that could be hoped for is for the explosives attached to the shell to create some kind of "dirty bomm" explosive effect. Could the explosion mix the nasty stuff or would an explosion destroy the chem compounds?
To further clarify, the shells were rigged with explosive charges made from C4 or dynamite strapped to the outside.
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