The movie was a classic.
My other big favorite WWII “espionage” story came from D-Day. Well known was the story of reporters sending their dispatches back to England from the beaches using carrier pigeons as they couldn't use radios. The pigeons got disoriented and flew the wrong way, into France. Often not included in the story was what happened next. German intelligence got the reports plus some film and decided it was all a ruse as nobody would be stupid enough to risk sending important information like that in such an unsecured manner.