Unknown to the allied until the very end of WWII, nazi scientists had discovered by accident a multitude of nerve agents before and during the war including in 1938 the now very infamous Sarin gas.
Despite having been mass produced and being ready for use during the entire war, it luckily never was. Had it been, it is likely the war would have lasted much longer and would have been much deadlier, it is also likely the first nuclear bomb would have been dropped on Berlin.
When WWII came to an end most of the supply and manufacturing plants were captured by the soviets and put back into production.
Despite having been mass produced and being ready for use during the entire war, it luckily never was. Had it been, it is likely the war would have lasted much longer and would have been much deadlier, it is also likely the first nuclear bomb would have been dropped on Berlin.
When WWII came to an end most of the supply and manufacturing plants were captured by the soviets and put back into production.
1964 US Army Training Film : https://www.youtube.com/watch?v=p2O5ndVkNKk
NY article: https://www.nytimes.com/2017/04/12/science/sean-spicer-hitle...