British intelligence fooled the Germans with a corpse that lost its documents

By early 1943, with the Allies planning to invade Sicily, British intelligence needed German high command to believe the real target was Greece and Sardinia instead. The obvious channels for planting that belief, a double agent's report, a diplomatic leak, an intercepted radio message, all shared the same weakness: German intelligence had already been burned by information delivered too conveniently.

Any document the British handed over, however indirectly, risked the same fate: dismissed the moment German analysts noticed it had been delivered too neatly. What the operation needed was information the Germans would believe they had found themselves, against British wishes, rather than information the British appeared to be offering.

Let the enemy find the lie by accident: a corpse washed ashore in neutral Spain carrying documents that looked lost, not planted, so German analysts trusted them.

The body washed ashore in neutral Spain, where authorities were known to share recovered materials with German intelligence, making the documents look like a British intelligence failure.

The elaborate personal legend (fiancée's photo, receipts, stubs) made the briefcase look like the unglamorous debris of a real life, not a planted package.

Because the Germans believed they had found the documents against British wishes, they bypassed the skepticism that had sunk previous, more conveniently delivered leaks.

When your audience distrusts your channel, let them discover the information through a channel that looks accidental or adversarial to you.

Spanish authorities recovered the body and, as expected, shared its contents with German intelligence before returning the documents to Britain. Bletchley Park intercepts confirmed by mid-May 1943 that German high command had accepted the deception: Hitler ordered troop reinforcements diverted to Greece and the Balkans, and even after the actual invasion of Sicily began on 9 July 1943, German command reportedly continued expecting the main Allied attack to fall on Greece.