 Three P-4 class torpedo boats (T-333, T-336, and T-339) in the service of the Democratic Republic of Vietnam were launched an abortive attack on the American Allen M. Sumner-class destroyer USS Maddox in August 2, 1964 in the first Gulf of Tonkin incident (see Edwin E. Moise, Gulf of Tonkin and the Escalation of the Vietnam War, University of North Carolina Press