Long before the United States was an independent nation, the people of the British Empire were constantly on guard for anything that might disrupt their way of life. This, in part, meant witches, and lots of them. Hundreds of alleged witches were hunted down and executed under a series of witchcraft laws that made it nice and legal to do so.
Eventually, Parliament had to step in and say enough was enough. In 1735, it passed the Witchcraft Act that made it a crime for a person to claim that any human being had magical powers or was guilty of practicing witchcraft. Surprisingly, it worked in Britain and people eventually stopped persecuting so-called witches.
Though laws regarding witchcraft didn't seem to be relevant anymore, that doesn't mean they were no longer on the books. Almost 200 years later, a self-professed medium named Helen Duncan was convicted under the Witchcraft Act of 1735, amid fears that she might actually be able to divulge intelligence about upcoming operations of World War II.
In November of 1941, Duncan held a seance in England where she claimed the ghost of a sailor aboard the HMS Barham visited her. The Barham was in the Mediterranean in 1941, fighting Axis ships attempting to cut off the resupply of the island of Malta. She was actually sunk off the coast of Egypt earlier that year. A German U-boat torpedoed the battleship, taking most of the crew down with it.
The problem was Helen Duncan wasn’t supposed to know that. The Royal Navy wouldn’t announce the sinking until 1942. The only people who were told were naval personnel and the families of those killed aboard the Barham. It caught the ears of naval intelligence, who decided to keep a close watch on Duncan the medium.
She was later arrested in January 1944 under the Witchcraft Act, with many believing that military leaders were concerned she might actually be able to talk to spirits. Some of her followers contended that superstitious military officers were afraid that, through her ghosts, she might be able to reveal the secret plans for Operation Overlord, the D-Day invasion of Nazi-occupied Europe.
That might have been the case, but the nail in the coffin for Helen Duncan did come in 1944. In January of that year, two Royal Navy officers attended one of Duncan’s seances. Duncan attempted to spook one of the men by “manifesting” first his deceased aunt, and then his deceased sister. There was just one little problem: the officer’s aunts and sisters were all still very much alive.
He reported Duncan to the police, who raided one of Duncan’s later seances. They found a hat band from a sailor’s uniform supposedly manifested from the HMS Barham. But the medium’s lack of uniform regulations did her in. The hat bands of British sailors at the time only read “HMS” and not the name of the vessel on which they served.
Duncan was tried and convicted of claiming to perform fraudulent spiritual activity, defrauding people of their money and generally being a public nuisance.
The real reason for Duncan’s arrest was likely the revelation of the sinking of the HMS Barham and her sources of information. Intelligence authorities weren’t worried about her getting information from ghosts, they were worried about the very real person from whom she gained classified information. Most importantly, they were concerned about how she was spreading that information.
Duncan was sentenced to nine months in jail.
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This article originally appeared on We Are the Mighty.