During World War II, British intelligence was boundlessly imaginative. To curb Adolf Hitler’s murderous madness, British spies even considered changing the Führer’s sex, according to a book set to be published in September and reviewed by The Daily Mail. They planned to conceal female hormones in the German leader’s food, which would be undetectable by taste and would gradually reduce his aggression.

The British government is said to have seriously considered this plan, deeming it “perfectly plausible.” “Hitler had people to taste his food, which prevented the use of poison, but hormones could not be detected as they work over the long term,” the British site explains. Allied spies were reportedly sent to implement this plan.

This attempt to neutralize Adolf Hitler is just one of the solutions considered by the British, according to Professor Brian Ford’s book “Secret Weapons: Technology, Science, And The Race To Win World War II.” Other ideas included dropping large amounts of glue to keep German troops stuck in certain areas or hiding bombs in cans of food exported to Germany.