Overview: Why did Hitler have an aversion to bio-weapons? A convincing theory is because of his experiences from the first world war when in October 1918, a young corporal Hitler is fighting on the frontline when he thinks he's been blinded by a mustard g ... By the summer of 1943, the tides of war are flowing in the allies favour. Germany is running out resources and man power. They are starting to clutch at straws ... and they are prepared to go to any lengths to win.