 Seaborn also warned that North Vietnam would suffer the "greatest devastation" from American bombing, saying that Johnson was seriously considering a strategic bombing campaign against North Vietnam.Little came of the back channel of the "Seaborn Mission" as the North Vietnamese distrusted Seaborn, who pointedly was never allowed to meet Ho.In late 1964, People's Army of Vietnam (PAVN) combat troops were sent southwest into officially neutral Laos and Cambodia.