Radio Hanoi was a propaganda radio station run by the North Vietnamese Army during the Vietnam War.
In September 1967, Radio Hanoi transmitted a message by General Võ Nguyên Giáp entitled "The Big Victory, The Great Task". Unbenknownst to Americans listening to the message, it was actually an outline to the upcoming Tet Offensive (which occurred on January 30, 1968). In the message, Giap stated: "U.S. Generals are subjective and haughty, and have always been caught by surprise and defeated."