So, it is widely known (at least in this forum) that Churchill had plans to use mustard gas against the german army in case Operation S****** went through. So, what if Hitler had the german equivalent of this? What if he wanted to use every resource at his hand to defeat any Allied invasion of Europe, so the Axis could concentrate in the East? What if, as Churchill had planned, he intended to use gas on any Allied troops that set foot in Europe, just that instead of mjstard gas they were sarin and tabun? What would the Allies do, and what consequences would the Allies' and Axis' actions have?
(yeah, I know about those stories of how Hitler, having suffered a gas attack inthe Great War despised it, but I'm not asking about the plausibility of the scenario, just the consequences, so please refrain to say how he never would do that and all of it it's ASB)