OSS slipped propaganda into German homes via forged mailbags

Leaflet propaganda, air-dropped in bulk over enemy territory, suffered a basic credibility problem: anything falling from an Allied plane was immediately identifiable as Allied propaganda before a German civilian even picked it up, making it easy to dismiss or hand over to authorities unread. The OSS Morale Operations Branch needed a way to get anti-Nazi material into German homes that didn't announce itself as propaganda on arrival — something recipients would open with their guard down.

The answer exploited standard postal-recovery procedure. On 5 February 1945, American P-38 fighter-bombers attacked a German mail train bound for Linz, destroying the locomotive and damaging a dozen freight cars, then a second wave dropped forged mailbags — containing letters and newspapers depicting a divided, demoralized German high command — near the wreckage. German postal workers, following their own routine procedure for a disrupted mail train, gathered up the scattered bags, including the fake ones, and delivered the contents through the normal postal system as if nothing had happened.

Dropped forged mailbags near a staged train wreck so postal workers recovered and delivered them by routine, carrying propaganda through a trusted channel.

Postal workers followed routine recovery procedure, gathering forged bags with real wreckage.

Real return addresses and plausible handwriting passed surface scrutiny.

Delivery by the trusted postal worker lowered recipients' guard.

The deception bypassed the moment of skepticism that direct airdrops triggered.

When your message will be distrusted due to its source, route it through a trusted process the target already uses without question.

Between February and April 1945, the 14th Fighter Squadron flew ten missions dropping 320 forged mailbags containing an estimated 96,000 propaganda letters over southern Germany and Austria, and postwar assessment confirmed the material did reach German homes, hand-delivered by the same postal service the operation had exploited.