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Communist aggression was the cause. The Vietnam War commenced in two phases:

1. Phase I-Infilitration into South Vietnam combined with a communist insurgency, VC forces living in South Vietnam...a guerrilla war.

2. Phase II-The Tonkin Gulf Incident, an actual naval engagement between the North Vietnamese Navy (Torpedo Boats) and the US Navy (Destroyer(s)) on 02 August 1964, then a "Tonkin Ghost" incident on 04 August 1964.

Phase II turned the war into a conventional Vietnam War, consisting of open warfare between Hanoi (N. Vietnam) & Washington (US).

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14y ago

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