Just the Facts? Not in Historical Fiction.

Both fictional works are based on a real British Naval Intelligence operation of World War II, where a corpse dressed as a royal marine was left in waters off the coast of Spain. The deceased marine carried papers suggesting that the European invasion would take place via Greece, rather than the true landing point of Sicily. Spoiler: German spies got hold of the documents and Hitler fell for the ruse, diverting troops from Sicily to Greece. Many thousands of Allied lives were saved as a result.