Three of them (T-333, T-336, and T-339) launched an abortive attack on the American Allen M. Sumner-class destroyer USS Maddox in August 2, 1964, starting the Gulf of Tonkin incident (see Edwin E. Moise, Gulf of Tonkin and the Escalation of the Vietnam War (Revised Edition), Naval Institute Press, 2019, pages 52-63).
Three of them (T-333, T-336, and T-339) initiated a futile assault on the American Allen M. Sumner-class destroyer USS Maddox on August 2, 1964, triggering the Gulf of Tonkin incident (see Edwin E. Moise, Gulf of Tonkin and the Escalation of the Vietnam War (Revised Edition), Naval Institute Press, 2019, pages 52-63).