Leaving stuff to be ‘found’ is a very old tactic. The British command used the Haversack Ruse, to fool the Turks defending Beersheba that Gaza was going to be the goal of the observed military manoeuvring.
Wasn’t there a body with Calais invasion plans that was placed so the Germans could find it?
Close but no cigar. Right idea, wrong invasion. It was Sicily.
https://en.wikipedia.org/wiki/Operation_Mincemeat
Right... like when the US broke the Japanese code during WWII and didn’t play that card right away