alternatehistory.com

What would have happened if use of chemical and biological was widespread from the start of World War Two? How does this effect the development of the war? Does one side have more to gain than the other?

PODs that could be used:

1.) The Poles use them as a last resort during conquest of Poland.

2.) Minor alterations to Hitler's personality.

3.) Both sides see Japan's use of chemical weapons in the Sino-Japanese war as evidence that treaties are not likely to be followed during war time, and adjust their doctrine accordingly.

4.) An early, accidental release of chemical weapons by one side (like http://en.wikipedia.org/wiki/Air_Raid_on_Bari, but worse) causes retaliation by the other side, and things spiral out of control.
Top