Mustard, wine and anthrax.
They would have been ordering 100 times the amount of the same, - which they actually did, with bombings.
The V2 would have been THE BADASS had it had one or more of the following qualities:
1. Being deployed like 2 years earlier
2. Being accurate to some 1km perhaps.
3. Being equipped with much heavier payload.
4. Being much more long ranged
Remember Gulf war I, scuds plonked off to the general direction of Israel? Terror, yes, moreso because of possible chemical weapons, but overall, nothing enough to win.
Apply terror bombing with out air superiority, and you are in deep doodly squat if you know what I mean.