Effect of large scale use of Sarin in ww2?

Yes, but nerve gases will kill a man even if he has a gas mask on. All it needs is access to the skin.
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Kursk
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But nerve gases are not all created equal. A very good contact-agent nerve gas is VX. It is dense, oily, somewhat persistent (in other words, surfaces become lethal and remain that way for some time), and also very lethal: the LD50% through skin contact is just 10 milligrams.
By contrast, sarin is the most volatile of them all, it quickly evaporates, it is easily dispersed in the air, it is not oily and it's nonpersistent; additionally the LD50% through skin contact is 1,700 milligrams.

Now, some 2 grams of the thing might seem very little; after all, there would be thousands of LD50%s in one artillery round. The problem is even distribution. The factor that helps distributing gases, i.e. air, is also the factor that quickly neutralizes such a volatile gas. It's not for nothing that the one real-life sarin attack took place in a subway system: a largely _enclosed_ place.
In the open, you would have an extremely lethal concentration within a short distance from the spot where the artillery round landed, with the danger quickly decreasing as you get away from that spot. Artillery rounds that distribute the gas while falling down would not be very suitable for sarin.
In these circumstances, a man wearing his gas mask and fully clothed, even with non-rubberized clothing, stands fair chances of surviving. If he has a canister of water at hand and douses himself and his clothes with it, he stands good chances.

The solution would be saturation. Firing enough artillery rounds to achieve a blanket effect, with evenly spread very high concentrations to counter the volatilization effect, during ideal weather conditions. But if the Germans tried that, say in mid-1944, they would use most of their sarin production in one go. If they tried that in mid-1943, at Kursk, they would definitely expend _all_ of their stockpile in one go.


 
But if say the Germans had had accurate intelligence on the time and place of D-Day, I guess that could have tempted them to use Sarin vs. the beachhead, but OTOH it will be the follow-up counterattack with panzers that make the difference - Sarin or not - the real PoD is the accurate intelligence.

Besides, I've spent several days in a row on those beaches in early summer. They never happened not to be windy.
 
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